To compare routine dose liver CT reconstructed with filtered back projection (FBP) versus low dose images reconstructed with FBP and adaptive statistical iterative reconstruction (ASIR). In this retro
Comparison of the Breast Dose based on the Existence of the Bismuth Breast Protection Shield for Automatic Exposure Control and Manual Exposure Control with the Coronary Artery CT Angiography - coronary artery CT angiography;bismuth breast shield;MEC;AEC;breast dose;
Introduction: To accomplish a further decrease in radiation dose for coronary CT angiography (CCTA), advances in iterative reconstruction (IR) algorithms are necessary. The purpose of the present study was to investigate the impact of a latest generation adaptive statistical IR algorithm (ASiR-V, GE Healthcare) on CCTA signal intensity, noise and image quality (IQ).. Methods: Sixty-five consecutive patients underwent clinically indicated CCTA using a latest generation 256-slice CT scanner (Revolution CT, GE Healthcare) and an ultra-low-dose CCTA protocol (i.e. a BMI-adapted tube current of 180-310 mA and tube voltage of 80-120 kVp). Datasets from each patient were reconstructed at different levels of ASiR-V (i.e. ASiR-V 0% [= filtered back projection, FBP], 20%, 40%, 60%, 80% and 100%). The signal intensity and noise (i.e. attenuation and its standard deviation [in HU]) were measured in each reconstruction by placing a region of interest in the aortic root as well as the proximal RCA and LMA. ...
Diagnostic and therapeutic radiation fields are planned so as to reduce side-effects while maximising the dose to site but effects on healthy tissues are inevitable. Radiation causes strand breaks in DNA of exposed cells which can lead to chromosomal aberrations and cause malfunction and cell death. Several researchers have highlighted the damaging effects of high dose radiation but still there is a lacuna in identifying damage due to low dose radiation used for diagnostic purposes. Blood is an easy resource to study genotoxicity and to estimate the effects of radiation. The micronucleus assay and chromosomal aberration can indicate genetic damage and our present aim was to establish these with lymphocytes in an in vitro model to predict the immediate effects low dose radiation. Blood was collected from healthy individuals and divided into 6 groups with increasing radiation dose i.e., 0Gy, 0.10Gy, 0.25Gy, 0.50Gy, 1Gy and 2Gy. The samples were irradiated in duplicates using a LINAC in the radiation
Cardiac CT - radiation doses, dose management and practical issues. L 11. Answer True or False. Patient dose from a cardiac CT is equivalent to 20 chest conventional radiographies. In cardiac CT the radiation dose to the different organs is very similar to the catheterization procedures....
CT scans expose patients to radiation, but are often a necessary part of cancer treatment. City of Hopes new CT scanner offers high resolution images with lower radiation doses.
The Report Computed Tomography Systems Market to 2019 - Lower Radiation Dose and Improved Workflow in Advanced CT Systems to Increase Adoption Rates provides information on pricing, market analysis, shares, forecast, and company profiles for key industry participants. - MarketResearchReports.biz
OBJECTIVE: To compare radiation doses delivered at prospectively ECG-triggered sequential- (SEQ), retrospectively ECG-gated spiral- (RETRO) and prospectively ECG-triggered high-pitch spiral- (HP) computed tomography coronary angiography (CTCA) protocols, as well as catheter coronary angiography (CCA) using an anthropomorphic phantom. MATERIALS AND METHODS: An anthropomorphic Alderson phantom equipped with 50 thermoluminescent dosimeters (TLDs) was scanned using different CTCA protocols and an uncomplicated diagnostic CCA examination was simulated. Absorbed doses were experimentally determined and effective doses calculated using the dose-length product (DLP) for CTCA and the dose-area product (DAP) for CCA, as well as according to International Commission on Radiation Protection (ICRP) publications 60 and 103. RESULTS: Effective organ doses were significantly lower for HP protocols (100kV: 0.17±0.26mSv; 120kV: 0.26±0.39mSv) compared to SEQ protocols (100kV: 0.50±0.79mSv; 120kV: 0.90±1.41mSv; ...
Objectives To report on a dose survey conducted by the French societies of radiology and paediatric imaging (SFR and SFIPP) and the French public service expert in nuclear and radiological risks...
Objectives: This study aimed to measure the absorbed doses in selected organs for prospectively ECG-triggered coronary computed tomography angiography (CCTA) using five different generations CT scanners in a female adult anthropomorphic phantom and to estimate the effective dose (HE). Materials and Methods: Prospectively ECG-triggered CCTA was performed using five commercially available CT scanners: 64-detector-row single source CT (SSCT), 2 × 32-detector-row-dual source CT (DSCT), 2 × 64-detector-row DSCT and 320-detector-row SSCT scanners. Absorbed doses were measured in 34 organs using pre-calibrated optically stimulated luminescence dosimeters (OSLDs) placed inside a standard female adult anthropomorphic phantom. HE was calculated from the measured organ doses and compared to the HE derived from the air kerma-length product (PKL) using the conversion coefficient of 0.014 mSv_mGy-1_cm-1 for the chest region. Results: Both breasts and lungs received the highest radiation dose during CCTA ...
OBJECTIVE The clinical utility of a latest generation iterative reconstruction algorithm (adaptive statistical iterative reconstruction [ASiR-V]) has yet to be elucidated for coronary computed tomography angiography (CCTA). This study evaluates the impact of ASiR-V on signal, noise and image quality in CCTA. METHODS Sixty-five patients underwent clinically indicated CCTA on a 256-slice CT scanner using an ultralow-dose protocol. Data sets from each patient were reconstructed at 6 different levels of ASiR-V. Signal intensity was measured by placing a region of interest in the aortic root, LMA, and RCA. Similarly, noise was measured in the aortic root. Image quality was visually assessed by 2 readers. RESULTS Median radiation dose was 0.49 mSv. Image noise decreased with increasing levels of ASiR-V resulting in a significant increase in signal-to-noise ratio in the RCA and LMA (P , 0.001). Correspondingly, image quality significantly increased with higher levels of ASiR-V (P , 0.001). CONCLUSIONS ...
Background Optimization of CT radiation dose is important for children due to their higher risk of radiation-induced adverse effects. Anatomical structures with high inherent contrast, such as bones can be imaged at very low radiation doses by optimizing scan parameters. Purpose To assess feasibility of sub-milliSievert whole spine CT scanning protocol for evaluation of scoliosis in children. Material and Methods With approval of the ethical board, we performed whole spine CT for evaluation of scoliosis in 22 children (age range, 3-18 years; mean age, 13 years; 13 girls, 9 boys) on a 128-slice dual source multidetector-row CT scanner. Lowest possible quality reference mAs value (image quality factor for xy-z automatic exposure control or xyz-AEC, CARE Dose 4D) was selected on a per patient basis. Remaining parameters were held constant at 3.0:1 pitch, 128 × 0.6 mm detector collimation, 115.2 mm table feed per gantry rotation, 100 kVp, and 1 and 3 mm reconstructed sections. Average mAs, ...
BACKGROUND AND PURPOSE: Advancements in medical device and imaging technology as well as accruing clinical evidence have accelerated the growth of the endovascular treatment of cerebrovascular diseases. However, the augmented role of these procedures raises concerns about the radiation dose to patients and operators. We evaluated patient doses from an x-ray imaging platform with radiation dose-reduction technology, which combined image noise reduction, motion correction, and contrast-dependent temporal averaging with optimized x-ray exposure settings. MATERIALS AND METHODS: In this single-center, retrospective study, cumulative dose-area product inclusive of fluoroscopy, angiography, and 3D acquisitions for all neurovascular procedures performed during a 2-year period on the dose-reduction platform were compared with a reference platform. Key study features were the following: The neurointerventional radiologist could select the targeted dose reduction for each patient with the dose-reduction platform,
The magnitude of the risks from low doses of radiation is one of the central questions in radiological protection. It is particularly relevant when discussing the justification and optimization of diagnostic medical exposures. Medical X-rays can undoubtedly confer substantial benefits in the healthcare of patients, but not without exposing them to effective doses ranging from a few microsieverts to a few tens of millisieverts. Do we have any evidence that these levels of exposure result in significant health risks to patients? The current consensus held by national and international radiological protection organizations is that, for these comparatively low doses, the most appropriate risk model is one in which the risk of radiation-induced cancer and hereditary disease is assumed to increase linearly with increasing radiation dose, with no threshold (the so-called linear no threshold (LNT) model). However, the LNT hypothesis has been challenged both by those who believe that low doses of radiation are
Background Endovascular aneurysm repair (EVAR) requires lifelong surveillance by computed tomography angiography (CTA). This is attended by a substantial accumulation of radiation exposure. Iterative reconstruction (IR) has been introduced to approach dose reduction. Purpose To evaluate adaptive statistical iterative reconstruction (ASIR) at different levels of tube voltage concerning image quality and dose reduction potential in follow-up post EVAR. Material and Methods One hundred CTAs in 67 patients with EVAR were examined using five protocols: protocol A (n = 40) as biphasic standard using filtered back projection (FBP) at 120 kV; protocols B (n = 40), C (n = 10), and D1 (n = 5) biphasic using ASIR at 120, 100, and 80 kV, respectively; and protocol D2 (n = 5) with a monophasic splitbolus ASIR protocol at 80 kV ...
View this term paper on Radiology Reducing Patient Exposure and. The quality of image can be affected through lack of correct levels of data compression and...
The issue of radiation dosage is confusing to many clinicians. Part of this confusion is related to the terminology, especially given that radiation-related quantities and effects can be expressed in many different ways and competing terms have been used inconsistently in the past. Radiation dose or absorbed radiation dose refers to the amount of energy deposited by ionizing radiation per unit mass in a patients body as a result of exposure. The units of absorbed dose are rads or millirads in conventional units or gray in SI units. A pertinent concept is that of the effective dose, expressed in units of rem or millirem or the SI unit of sievert or millisievert. Effective dose takes into account the different risks of absorbed dose to various organs and is a useful method of comparing risk among different diagnostic tests. The effective dose equivalent is the sum of the products of the effective dose to the organ or tissue and weighting factors specific to each of the body organs or tissues. The ...
by admin , Mar 15, 2013. Radiation dose received by patients during invasive cardiology procedures has the potential to cause skin damage and is assumed to include a small cancer risk. To help ensure patient safety, it is desirable to minimize patient radiation dose to patients undergoing these procedures. An inherent benefit of reduced patient dose is reduced dose to physician operators and staff. Previous studies have tested patient radiation dose-reduction initiatives for radiofrequency ablation and invasive coronary artery procedures. Few studies, however, have explored the effects of using sustained patient radiation dose-reduction initiatives in larger, diverse invasive cardiovascular settings. A Progressive Movement on Patient Radiation In an issue of JACC: Cardiovascular Interventions, Kenneth A. Fetterly, PhD, and colleagues had a single-center study published that investigated the effects of sustained practice and x-ray system technical changes on radiation doses administered to adult ...
NIH Funding Opportunities and Notices in the NIH Guide for Grants and Contracts: Decreasing Patient Radiation Dose from CT Imaging: Achieving Sub-mSv Studies (U01) PAR-12-206. NIBIB
Introduction: Coronary computed tomography angiography (CTA) is increasingly used for the non-invasive evaluation of symptomatic coronary artery disease (CAD). However, potential risks of coronary CTA include exposure to ionizing radiation. Lowering tube voltage can significantly decrease radiation dose, but the effects on image quality are unknown.. Hypothesis: To determine if a very low tube voltage of 80kVp is feasible to further minimize radiation dose and maintain diagnostic image quality of coronary CTA.. Methods: We analyzed 191 consecutive patients with low-intermediate probability of CAD, who were evaluated for acute chest pain with 64-multidetector row coronary CTA (Lightspeed, GE Medical). Tube voltage protocols used either standard 120kVp, low 100kVp, or very low 80kVp, depending on physician discretion. Primary end points were radiation effective dose (mSv) and image quality assessed with a 4-point grading system (0 = excellent, 3 = nondiagnostic). Secondary analysis included the ...
Our direct, intraindividual head-to-head comparison in the same patient population shows that compared with a routine radiation dose FBP protocol, a 50% reduced radiation dose image acquisition using IR preserves image quality and, more importantly, diagnostic accuracy at coronary CTA. These findings illustrate the potential of substantial radiation dose reduction across the population for coronary CTA studies, enabled by a reduced tube current-time product when iteratively reconstructed, without jeopardizing the diagnostic yield of the examination.. Since its inception, radiation doses associated with noninvasive coronary CTA had risen with each new generation of multidetector-row CT systems and had reached its zenith with the launch of the first-generation 64-slice scanners in the year 2004. With these platforms, radiation doses from coronary CTA were reported to be as high as approximately 30 mSv, with an estimated median of approximately 12 mSv (15). Since then, vigorous efforts have been ...
Since the 1970s, mammograms have made a huge impact on detecting breast cancer in its earliest stages, when it is most treatable - it remains the best method for early detection today," says Mary Lechner, MD, medical director at Park Nicollet Jane Brattain Breast Center.. During a mammogram, low dose radiation (X-ray) is passed through a compressed breast, source ifreebudget.com/lipo-flavonoid-plus-reviews.html. The compression is necessary to provide an accurate picture. Images produced by mammograms can detect a tumor as early as two years before a doctor or patient can feel a lump.. "I tell women that yearly mammograms can reassure them that their breasts are normal - and if there is an abnormality, mammograms can detect it early, when there are more treatment options if it proves to be cancer, and survival rates are higher," Dr. Lechner says.. ...
All studies involving use of ionizing radiation should be performed in accordance with the ALARA (As Low As Reasonably Achievable) principle, especially in children. In this study, the prospective ECG triggering technique with low voltage was used in dual-source computed tomography (DSCT) angiography to investigate if image quality with low radiation dose could be satisfactory in pediatric patients with congenital heart disease. Sixty pediatric patients with suspected congenital cardiovascular anomalies were enrolled prospectively in the study. They were randomly assigned to two groups for DSCT angiography. Group A were scanned by prospective ECG-triggering computed tomography angiography (CTA) with 80 kV tube voltage, while group B by used non-ECG-gated CTA with the same tube voltage. The anomaly accuracy was evaluated based on the surgical and/or conventional cardiac angiography findings. The overall image quality was assessed on a five-point scale. And the diagnostic accuracy and radiation dose was
Authors: Tan, Wenli , Zhan, Songhua , Yang, Shuohui , Zhuang, Yuan , Cheng, Ruixin , Zhan, Hongsheng Article Type: Research Article Abstract: OBJECTIVE: The aim of this study was to investigate the significance of the combined use of BMI and AEC in reducing the radiation dose of CT volume scans of the lumbar spine. METHODS: A prospective study was performed to continuously collect data from 50 patients (age range from 19 to 60 years, male versus female 20/30) whose BMIs were less than 25 kg/m^{2} (group A) and 50 patients (age range from 21 to 82 years, male …versus female 24/26) whose BMIs were equal to or more than 25 kg/m^{2} (group B). The 50 patients in each group were randomly divided into 5 subgroups with each subgroup having lower radiation dose from subgroup 1 to 5. All the patients were performed lumbar spiral CT scans (GE LightSpeed VCT 64-slice scanner) and the scan parameters were different in different subgroups. Volume CT dose index (CTDIvol) was recorded. The qualities of the ...
Scans were performed by the use of a 64-channel MDCT scanner (Brilliance 64, Philips Healthcare, Cleveland, Ohio) without the administration of medication to lower the patients heart rate. Scan parameters were a collimation of 64 × 0.625 mm, rotation time 0.42 s, tube voltage 120 kV, and tube current of 500 to 600 mAs corresponding to an approximate mean radiation dose of 5.5 mSv. A dose modulation protocol was applied to reduce the radiation dose during systole (17). An ECG was recorded simultaneous to the CT scan to enable retrospective gating of the image data. A dedicated cardiac gating algorithm was used that identified the same physiological phases of the cardiac cycle while taking into account the nonlinear changes in the individual cardiac states with the heart rate variations during the CT acquisition (18). A cardiac adaptive multisegment reconstruction technique was used that combined data from consecutive cardiac cycles, thus significantly improving temporal resolution between 53 ...
The RSNA 2011 conference marks the 97th Scientific Assembly and Annual Meeting. This event, the worlds premier medical meeting for radiologic professionals, is being held on November 27 through December 2 at the McCormick Place in Chicago. The annual conference includes unparalleled education and professional development, networking opportunities, and a cutting- edge technical exhibition.. I will be involved in a number of events, both as a presenter and an author. The presentations that I will be involved in include:. • Presenter- Hot Topics: Dual- Energy CT on Tuesday, November 29 from 7:15 am to 8:15 am.. • Presenter- Refresher: Mind Your Own Business! Required Business Skills for Your First Job on Thursday, December 1 from 4:30 pm- 6:00 pm.. • Author/ Participant- Gastrointestinal Series: Scientific Formal Presentation (Dual-Energy CT of Hypervascular Liver Lesions: Evaluation of Lesion Contrast-to-Noise with Different Monochromatic keV Reconstructed Images) on Monday, November 28 ...
June 30, 2017 -- Egypt has unveiled the first national diagnostic reference levels (DRLs) for CT, but senior radiologists still have concerns about radiation dose. Areas for improvement include the selection of exposure parameters for different examinations, taking into account the image quality, with particular attention on facilities using consistently higher doses compared with DRLs. Discuss ...
Lung cancer is the leading cause of cancer-related death worldwide. The poor prognosis of lung cancer has barely changed in the last decades, but the prognosis is better when the disease is detected earlier.
Poster: EuroSafe Imaging 2020 / ESI-07643 / Comparative study of patient doses and establishment of local diagnostic reference levels in Computed Tomography in line with the new ICRP recommendations by: S. Avramova-Cholakova, E. Kulama
The situation in Italy regarding radiation dose to patients undergoing Multidetector row Computed Tomography (MDCT) scans is unclear despite Italian law
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1. Thyroid-accelerated metamorphosis in the larval frog is accompanied by changes in the hemopoietic centers and in the blood cell distribution in the various regions of the body. These changes are interpreted as results of the fundamental change in basal metabolic rate induced by the thyroid treatment.. 2. There is initiation of the shift of hemopoietic locus from the kidney, the larval hemopoietic organ, to the spleen, the adult hemopoietic organ. The spleen, being chiefly an erythrocyte producer, becomes of greater importance with the transition from the lower metabolic rate to the higher, since greater erythropoiesis becomes necessary to supply the physical basis for the maintenance of the higher metabolic rate.. 3. It is suggested that the appearance of red bone marrow in the later history of the frog is correlated with a still higher metabolic rate. Phylogenetically, in the vertebrate series, red bone marrow is also associated with higher metabolic rate.. 4. The new metabolic rate ...
Research, published in PLOS Genetics, reports that low doses of radiation used in medical imaging may lead to mutations in cell cultures.. Prof Geraldine Thomas, Professor of Molecular Pathology, Imperial College London, said:. "This is an interesting paper that seeks to investigate the how various types of DNA repair affect random integration of DNA from non-chromosomal sources following a double strand break. "This paper should not be taken as evidence that low dose radiation exposure is likely to result in DNA integration when used in diagnostic procedures in vivo, nor should this work be taken for evidence that exposure to low dose radiation results in cancer in man. "In terms of the mechanisms by which this might occur it is interesting, but caution should be taken before extrapolating results on cell lines (murine or human) into the likely effects of radiation in vivo in man. Cell lines are produced as a result of clonal selection in vitro - this process results in a change in the genetic ...
Images of excised breast samples of 2-4 cm thickness were acquired at beamline ID17 (The Biomedical Beamline), with a mean glandular dose of only 0.12 mGy. In Figure 117, the raw EI image (Figure 117a) and the retrieved phase image (Figure 117b) are compared to the conventional mammogram acquired at a hospital (Figure 117c) (32 kVp, dose of 4.1 mGy). Despite the high X-ray energy and the extremely low radiation dose, all the breast structures are highlighted in the raw EI image by the refraction-induced signal present at their boundaries. The area contrast typical of conventional X-ray images (more easily interpretable to radiologists), in turn, is restored in the retrieved phase map. This image depicts breast features with at least the same quality as in the conventional mammogram, although at a dose reduced by more than one order of magnitude.. The EI method has also been demonstrated to work efficiently in table-top setups exploiting conventional rotating anode sources [3]. The next step in ...
CHICAGO - Is radiology making progress in reducing the radiation dose used...Read more on AuntMinnie.comRelated Reading: Video from RSNA 2019: Whats happening with MRI safety Video from RSNA 2019: Dr. Paul Chang on AI and radiology Video from RSNA 2019: Vaping and lung disease JAMA: Medical imaging use rates continue to rise CT radiation dose levels vary widely, new study finds...
by Physicians Weekly , Aug 16, 2012. Recurrent and second primary head-and-neck squamous cell carcinomas (HNSCC) arising within or close to previously irradiated areas are a significant clinical challenge. Salvage surgical resection is the standard of care, but reirradiation is the only potentially curative treatment when surgery is not an option. Reirradiation is more challenging than initial treatment because of the side effects of prior therapy and concerns about the risks of high cumulative radiation doses to normal structures. Multi-institutional trials and large single institutional experiences have demonstrated that aggressive reirradiation, most often with chemotherapy, is feasible and provides durable locoregional control in some patients. An Expert Consensus on Reirradiation In the August 1, 2011 International Journal of Radiation Oncology * Biology * Physics, the American College of Radiology (ACR) published appropriateness criteria for recurrent head and neck cancer after prior ...
The purpose of this article is to retrospectively determine the image quality and degree of radiation dose reduction that is clinically acceptable for CT-guided renal tumor cryoablation. A total of 15 patients (17 procedures; mean age, 67 years
The new high-resolution CT system with low radiation dose Radiation dose reduction of up to 83% in cardiac scans and 50% across the rest of the body Improved resolution--33% higher than the conventional ...
We also analyzed effects of low dose radiation on DNA double strand break repair using a transgenic mouse model in which homologous recombination (HR) events at a transgenic reporter give rise to fluorescent cells. To establish this model as a study tool for radiation effects we first exposed mice to 6 Gy radiation and analyzed the number of HR events. Treated animals displayed a significantly higher frequency of HR events than littermate controls (n=25; p=0.006). We then exposed transgenic mice to continuous very low dose radiation as described above and analyzed HR frequency but did not detect any difference in HR frequency as compared to littermate controls (n=60; p=0.8 ...
The major goal of this study was to identify and quantitatively describe the association between the characteristics of chronic (low-dose rate) exposure to (low LET) ionizing radiation and cellularity of peripheral blood cell lines. About 3,200 hemograms (i.e., spectra of blood counts) obtained over the years of maximal exposure to ionizing radiation (1950-1956) for inhabitants of the Techa River were used in analyses. The mean cumulative red bone marrow dose (with standard errors), calculated using Techa River Dosimetry System-2000, was 333.6 +/- 4.6 mGy (SD = 259.9 mGy, max = 1151 mGy) to the year 1956. The statistical approach included both empirical methods for estimating frequencies of cytopenic states of the investigated blood cell lines (e.g. neutrophile, platelets, erythrocyte, etc.), and regression methods, including generalized linear models and logistic regressions which allowed taking into account confounding factors (e.g., attained age, age at maximal exposure, presence of ...
Johnson, P., Lee, C., Johnson, K., Siragusa, D., Bolch, W.E. . The influence of patient size on dose conversion coefficients: A hybrid phantom study for adult cardiac catheterization ...
Background: Although the effects of high dose radiation on human cells and tissues are relatively well defined, there is no consensus regarding the effects of low and very low radiation doses on the organism. Ionizing radiation has been shown to induce gene mutations and chromosome aberrations which are known to be involved in the process of carcinogenesis. The induction of secondary cancers is a challenging long-term side effect in oncologic patients treated with radiation. Medical sources of radiation like intensity modulated radiotherapy used in cancer treatment and computed tomography used in diagnostics, deliver very low doses of radiation to large volumes of healthy tissue, which might contribute to increased cancer rates in long surviving patients and in the general population ...
Different probabilities exist for the occurrence of stochastic radiation effects in various organs and tissues. This different sensitivity to stochastic radiation damage is considered in the ICRP Publication 60, in the Euratom basic standards for Radiation Protection dated May 1996 by the tissue weighting factor in calculations of the effective dose. To calculate the effective…
This is to our knowledge the first study on hippocampal volumes after low dose radiation to the basal part of the adult human brain. Although the dose to the hippocampus could not be calculated directly, the estimates of radiation dose to relevant areas are probably more exact than in any previous study. The small study size is an effect of our ambitions to minimize the influence of confounding factors in an original sample of 101 patients. Moreover, the patient sample is homogeneous in terms of treatment with the exception of two patients who received a higher radiation dose; these were treated separately in the statistical analysis.. Automatic methods for hippocampal volumetry are rapidly gaining acceptance. They have undisputed advantages in terms of cost, inter-rater reliability and comparability between studies. However, for small-scale studies involving only intra-study comparisons, we would argue that manual segmentation is still superior. This is even more so since the issue of ICV ...
In dual-source dual-energy CT, the imagesreconstructed from the low- and high-energy scans (typically at 80 and 140 kV, respectively) can be mixed together to provide a single set of non-material-specific images for the purpose of routine diagnostic interpretation. Different from the material-specific information that may be obtained from the dual-energy scan data, the mixed images are created with the purpose of providing the interpreting physician a single set of images that have an appearance similar to that in single-energy images acquired at the same total radiation dose. In this work, the authors used a phantom study to evaluate the image quality of linearly mixed images in comparison to single-energy CTimages, assuming the same total radiation dose and taking into account the effect of patient size and the dose partitioning between the low-and high-energy scans. The authors first developed a method to optimize the quality of the linearly mixed images such that the single-energy image quality was
The collaboration between Biocartis and Horizon has contributed greatly to the successful market launch of the Idylla™ MSI Assay in July 2018 ...
In the paper "Dose is Not Always What it Seems" Anthony Seibert, professor of radiology, and his colleagues discuss the need to improve dose calculations. They point to an actual case in which a pediatric patient who had scans before and after surgery appeared to receive an overdose on the second CT. Further investigation showed that the problem was a misleading metric - the volume CT dose index (CTDIvol), a standard measure of radiation output in CT. Manufacturers use phantoms along with instruments that measure radiation to assess CTDIvol. However, different companies use phantoms of different sizes. In addition, many dose estimates are based on adult sizes, making pediatric estimates more difficult ...
Dosimeters are to be supplied and worn if the practice involves the use of ionising radiation sources specified in the regulation and when there is a potential external exposure to radiation.. A dosimeter is used to monitor personnel exposure to ionising radiation and may be worn on the trunk or finger depending on the radiation source and point of exposure. The person issued the dosimeter must wear the device when using the radiation source. As reasonably practical ensure the dosimeter is only exposed to ionising radiations that impact the wearer during the normal course of work.. It is a requirement that the RSPP must clearly detail if dosimeter monitoring is required. The request for a dosimeter is sent to the WHS Unit specifically the WHS Biological, Radiation and Chemicals Safety Advisor.. The WHS Unit maintains a central register of wearers and cost centres.. The exposure monitoring results are to be sent by the WHS Unit to each of the Radiation Safety Officers. ...
Using chest tomosynthesis with a digital radiography (DR) system reduced the number of chest CT exams performed at a Swedish institution, leading to lower radiation dose and better use of CT resources, according to a presentation from last weeks RSNA meeting.. DR tomosynthesis creates 3D reconstructions of x-ray images acquired as the systems tube head pans around a region of interest. Tomo proponents believe the technology can be used to see around pathology that obstructs conventional DR images, allowing the use of lower-dose x-ray in some patients who previously were sent to CT.. For example, patients with lung nodules traditionally have been sent straight to CT after a suspicious chest x-ray. Now, the Swedish radiologists believe that some could be redirected to chest DR tomosynthesis.. The chest tomosynthesis unit at Sahlgrenska University Hospital in Gothenburg was introduced in 2006, and since then, more than 5,000 exams have been performed. The hospital has seen DR tomos share of ...
Conversion chart for rad (Absorbed radiation dose, radiation units conversion). Instant units and measurements conversion, metric conversion and other systems. Many units supported from common to very exotic ones.
Results The prevalence of obstructive CAD and functionally significant CAD were 69% and 44%, respectively. Coronary CTA alone demonstrated a per-vessel and per-patient sensitivity, specificity, negative predictive value, positive predictive value, and accuracy of 98%, 76%, 99%, 63%, and 83% and of 98%, 54%, 96%, 68%, and 76%, respectively. Combining coronary CTA with stress CTP, per-vessel and per-patient sensitivity, specificity, negative predictive value, positive predictive value, and accuracy were 91%, 94%, 96%, 86%, and 93% and 98%, 83%, 98%, 86%, and 91%, with a significant improvement in specificity, positive predictive value, and accuracy in both models. The mean effective dose for coronary CTA and stress CTP were 2.8 ± 1.4 mSv and 2.5 ± 1.1 mSv.. ...
ALAT UKUR RADIASI (1) ANATOMI (2) ARTERIOGRAFI FEMORALIS (1) AUTOMATIC EXPOSURE CONTROL (1) Automatic Processor (1) BAHAN KONTRAS (8) BMD-OSTEOPOROSIS (5) BODY SECTION RDIOGRAFI (1) COLON IN LOOP (1) Computed Tomography History and Technology (1) COMPUTER RADIOGRAFI (9) COMPUTER RADIOGRAFI 1 (1) COMPUTER RADIOGRAFI 2 (1) CT SCAN SHEERAM (2) CT ABDOMEN (1) CT ANGIO (1) CT ANGIO CAROTIS (1) CT ANGIO CEREBRAL (1) CT ARTEFACT (1) CT SCAN (21) CT SCAN - SHEERAM DATA PROSESING (1) CT SCAN -CTDI (1) CT Scan Abdomen (2) CT SCAN DUAL SOURCE (1) CT Scan Kepala (3) CT SCAN SHEERAM (6) CT SCAN THORAKS (1) CT SCAN-EBCT (1) CT SCAN-SHEERAM (2) CT UROGRAFI (1) DAN PA ) (1) DENTAL RADIOLOGI (2) Diffusion-weighted and Diffusion Tensor MR imaging (1) DIGITAL RADIOGRAFI (4) DOSIMETRI (6) DOSIMETRI-TLD (1) DRAFT MODUL STANDAR TEKNIK RADIOGRAFI (1) ETIKA (1) FAKTOR EKSPOSI (1) FILM RADIOGRAFI (7) FISIKA IMEJING (5) FISIKA IMEJING - CT SCAN (1) FISIKA IMEJING - MRI (6) FISIKA IMEJING -PET (2) FISIKA IMEJING CT SCAN ...
ALAT UKUR RADIASI (1) ANATOMI (2) ARTERIOGRAFI FEMORALIS (1) AUTOMATIC EXPOSURE CONTROL (1) Automatic Processor (1) BAHAN KONTRAS (8) BMD-OSTEOPOROSIS (5) BODY SECTION RDIOGRAFI (1) COLON IN LOOP (1) Computed Tomography History and Technology (1) COMPUTER RADIOGRAFI (9) COMPUTER RADIOGRAFI 1 (1) COMPUTER RADIOGRAFI 2 (1) CT SCAN SHEERAM (2) CT ABDOMEN (1) CT ANGIO (1) CT ANGIO CAROTIS (1) CT ANGIO CEREBRAL (1) CT ARTEFACT (1) CT SCAN (21) CT SCAN - SHEERAM DATA PROSESING (1) CT SCAN -CTDI (1) CT Scan Abdomen (2) CT SCAN DUAL SOURCE (1) CT Scan Kepala (3) CT SCAN SHEERAM (6) CT SCAN THORAKS (1) CT SCAN-EBCT (1) CT SCAN-SHEERAM (2) CT UROGRAFI (1) DAN PA ) (1) DENTAL RADIOLOGI (2) Diffusion-weighted and Diffusion Tensor MR imaging (1) DIGITAL RADIOGRAFI (4) DOSIMETRI (6) DOSIMETRI-TLD (1) DRAFT MODUL STANDAR TEKNIK RADIOGRAFI (1) ETIKA (1) FAKTOR EKSPOSI (1) FILM RADIOGRAFI (7) FISIKA IMEJING (5) FISIKA IMEJING - CT SCAN (1) FISIKA IMEJING - MRI (6) FISIKA IMEJING -PET (2) FISIKA IMEJING CT SCAN ...
Pulse Diagnostics Pvt Ltd on Nov 3, 2012 in Kolkata launched a new generation of Low Dose CT Scanner, the Brivo CT385, that provides high resolution images at lower radiation dose and has several patient and user friendly features. Tollywood actress Konnenica Banerjee inaugurated the CT Scan, along with Dr. Karthik Anantharaman - Marketing Manager, CT & Healthcare Services, South Asia, GE Healthcare and Sunaina Bihani, CEO, Pulse Diagnostic Pvt Ltd.. ...
The SARRP is also used to study the effects of low radiation doses (≤ 2 Gy). The consequences of this type of exposure on brain function and on the related pathophysiological mechanisms are studied through the development of several irradiation models on the facility (highly localized irradiation of certain cerebral sub-structures and of the whole head).. Lastly, the irradiator is used by the IRSN as part of the ROSIRIS program, the purpose of which is to better understand the causal relationship between the early effects and the delayed effects of ionizing radiation on the body. The type of initial radiation-induced cell damage depends on the way in which the energy of an ionizing particle is deposited within a cell, and therefore the physical characteristics of that particle. To analyze the damage, one of the research avenues consists of establishing links between biophysical modeling of early radiation-induced events and their later consequences on molecules and cells, by studying the ...
This chart explains the different amounts of radiation given off from different objects, including bananas, plane journeys and more. I also read on a different chart that sleeping next to another person gives you half the amount of radiation that a banana does, so make sure you stay on the safe side and do what I do, sleep alone and have no human interaction, especially with females ...
Brewster, Horticulture Research International, Wellesbourne. If you are a columnist for this chemotherapy, would you avoid to be syndromes through spread cage? mention seeking whirls and additional GI weeds on your Kindle in under a download low dose exposures in the environment dose effect relations and risk evaluation.
Get this from a library! Low dose exposures in the environment : dose-effect relations and risk evaluation. [Christian Streffer; Europäische Akademie zur Erforschung von Folgen wissenschaftlich-technischer Entwicklungen Bad Neuenahr-Ahrweiler.;] -- The ever-increasing release of harmful agents due to human activities have led in some areas of the world to heavy pollution. In order to protect human health and the environment, environmental ...
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Recently, concerns about radiation dose have generated reservations about using CTP in stroke imaging. The average effective patient doses of NCCT, CTA, and CTP studies are 3 mSv, 3 mSv, and 2.5-3.5 mSv, respectively,17 adding up to an effective dose of approximately 9 mSv for a multimodal examination incorporating all 3 elements. While CTP scan coverage has been generally confined to a range of 2-4 cm, equaling the detector width, with the imaging slab centered on the basal ganglia and angled away from the eyes, the latest CT scanners provide full-brain CTP, either through the use of wide detectors ≤16 cm, by using shuttle modes, or through the use of continuous spiral scans. These whole-brain CTP techniques usually result in even higher radiation exposure. Especially, direct exposure of the eye lens is of concern.9 A desire to reduce radiation dose without sacrificing diagnostic image quality has led to the evaluation of alternate CTP protocols, especially those using a reduced TR (2-second ...
* Ex-PM cries foul after hospital search * Prison officials remove technical devices * She says they measured high radiation levels KIEV, Sept 13 (Reuters) - Jailed Ukrainian opposition
Few uncommitted, pluripotent stem cells in red bone marrow throughout life time (Fig 16-2) Controlled by cytokines, e.g. Erythropoietin (hormone or cytokine?) CSFs (Colony-stimulating factor)and ILs (interleukins): e.g. M-CSF, IL-3 (= multi CSF) Neulasta (pegfilgrastim) is a CSF Thrombopoietin (TPO) Some Terminology: Anemia vs. Leukemia vs. leukocytosis vs. leukopenia Any of various acute or chronic neoplastic diseases of the bone marrow in which unrestrained proliferation of white blood cells occurs, usually accompanied by anemia, impaired blood clotting, and enlargement of the lymph nodes, liver, and spleen. Leukemias ("white blood") group of cancerous conditions of WBCs. Named according to the abnormal WBC type primarily involved (e.g. lymphocytic leukemia, myelocytic leukemia). Leukemia is acute (quickly advancing - mostly in children) if it derives from blast-type cells like lymphoblasts, and chronic (slowly advancing - mostly in adults) if it involves proliferation of later cell stages ...
|p|Hematopoietic stem cells (HSCs) are located in the red bone marrow, and differentiate to give rise to myeloid, erythroid, and lymphoid lineages of cells which can further differentiate into specialized blood cells. The differentiation of HSCs into specialized cells is orchestrated by a complex in
The patient is often incontinent. The vitamins folic acid and vitamin B12 are necessary for DNA synthesis in the kelfex cells of the red bone marrow. Tobagus, B.
Mahameru International offer an extensive array of services supported by well-equipped facilities to detect the onset of diseases and to provide medical care in various medical disciplines.
Mahameru International offer an extensive array of services supported by well-equipped facilities to detect the onset of diseases and to provide medical care in various medical disciplines.
1In clinical practice, the use of ADMIRE may reduce CT patient dose depending on the clinical task, patient size, anatomical location, and clinical practice. A consultation with a radiologist and a physicist should be made to determine the appropriate dose to obtain diagnostic image quality for the particular clinical task. ...
Widespread overuse of CT scans and variations in radiation doses caused by different machines and different operators are subjecting patients to high radiation doses that will lead to tens of
A spherical cap transducer is provided with at least one electrode formed as segments. The segments are selectively driven to provide asymmetrical ovoid effective radiation patterns for treatment of tissue with ultrasonic radiation.
Title: Evaluating New Radiation Techniques for Cardiovascular Imaging. Background:. - Imaging studies such as computed tomography (CT) scans involve the use of radiation to create the pictures. Heart and blood vessel CT scans can cause high radiation exposure. Different methods of creating CT pictures have been developed to reduce the radiation dose. Researchers want to see how effective these new methods are in producing accurate CT scans.. Objectives:. - To study new ways of taking pictures of the heart or blood vessels using computed tomography.. Eligibility:. - Adults at least 18 years of age who will be having imaging studies to help detect heart or blood vessel problems.. Design:. ...
Dose monitoring software is predominantly being implemented for use with CT scanners. Fluoroscopy also can exposure patients to high radiation doses. Because...
Independent ten year review of NIOSHs activities under Subtitle B of EEOICPA. Examines the quality of science, timeliness of task accomplishments, special exposure cohort, dose reconstructions, and quality of service.
Radiation radicalizes elements and compounds in the body. Unchecked, these free radicals damage cells, killing them. When enough cells die, the organism succumbs. But a new therapy infused into the cells of mice offers protection against radiations effects, at least for a short while. Radiation oncologist Joel Greenberger of the University of Pittsburgh and his colleagues have been experimenting with a transgene--manganese superoxide dismutase plasmid liposome (MnSOD-PL)--that has shown the ability to protect cells from radiation in vitro. Tested in mice in specific organs, such as the lungs and bladder, the transgene conferred significant protection and is currently being tested in human lung cancer patients undergoing radiation therapy. The new work shows that mice intravenously infused with the transgene enjoy protection throughout their bodies when exposed to radiation at levels known to kill 50 percent of their normal peers. "These are experiments in which mice are given total body ...
derGoldstein writes Discovery posted an interesting story of how X-rays that are used by astronomers for determining the various chemical abundances inside stars could also potentially be used for more effective radiation therapy: Radiation treatment is a coarse instrument at best, since it destro...
MP Bios thermoluminescent (TLD-XBGN) dosimeter badges measure ionizing radiation and can be used to determine accurate radiation exposure in the workplace. The badge contains four separate thermoluminescent phosphors for calculating tissue equivalence and determining actual doses of radiation. When the phosphors are heated, previously absorbed energy from ionizing radiation exposure is re-emitted in the form of light. The light output is measured, and the dose is calculated. A report is published with a minimal reportable dose of 10mrem.. ...
You may want to ask your doctor about the amount of radiation used during the procedure and the risks related to your particular situation. It is a good idea to keep a record of your past history of radiation exposure, such as previous scans and other types of X-rays, so that you can inform your doctor. Risks associated with radiation exposure may be related to the cumulative number of X-ray examinations and/or treatments over a long period of time.. If you are pregnant or suspect that you may be pregnant, you should notify your health care provider. Radiation exposure during pregnancy may lead to birth defects. If it is necessary for you to have a mammogram, special precautions will be made to minimize the radiation exposure to the fetus.. Mammograms may be more difficult to interpret in women younger than 30 years of age, due to the increased density of their breast tissue.. Some discomfort may be felt as the breast is compressed against the X-ray plate during the procedure. This compression ...
Luckey hopes to change that viewpoint and argues that more than 3000 scientific papers in the research literature point to low doses of radiation as being beneficial in human health. He points out that, as with many environmental factors, we have evolved to live successfully in the presence of ionising radiations. His own research suggests that radiation exposure can minimise infectious disease, reduce the incidence of cancer in the young, and substantially increase average lifespan.. Studies on the growth, average lifespan, and decreased cancer mortality rates of humans exposed to low-dose irradiation show improved health, explains Luckey. This represents good evidence that we live with a partial radiation deficiency and that greater exposure to radiation would improve our health, a notion supported by 130 on the health of people living in parts of the world with higher background levels of ionising radiation than average.. Luckey suggests that the medical use of small samples of partially ...
RadTrac launches an updated version of their radiation dose tracking system to help prevent radiation overdose from medical exams for hospitals and other medical facilities and helps to improve patient...
The sievert device is Utilized in the report of the effective dose. The sievert unit, during the context of CT scans, doesnt correspond to the particular radiation dose the scanned entire body aspect absorbs but to another radiation dose of A further state of affairs, The complete entire body absorbing one other radiation dose and another radiation dose becoming of the magnitude, believed to contain the identical probability to induce cancer because the CT scan ...
Women tend to overestimate the radiation risk associated with mammography, according to a study presented at the annual meeting of the American Roentgen Ray Society.
Radiation doses from computed tomographic (CT) scans are higher than previously thought and vary widely, even among the same types of examinations, two studies showed.
A radiation therapy/surgery device optimised to meet the needs of the Neurosurgeon is provided, i.e. one for the treatment of tumours in the brain. It combines the qualities of a good penumbra and accuracy, simple prescription and operation, together with high reliability and minimal technical support. The device comprises a rotateable support, on which is provided a mount extending from the support out of the plane of the circle, and a radiation source attached to the mount via a pivot, the pivot having an axis which passes through the axis of rotation of the support, the radiation source being aligned so as to produce a beam which passes through the co-incidence of the rotation axis and the pivot. It will generally be easier to engineer the apparatus if the rotateable support is planar, and more convenient if the rotateable support is disposed in an upright position. The rotation of the rotateable support will be eased if this part of the apparatus is circular. A particularly preferred
Read this full essay on Effects of Radiation Exposure. Environments are greatly affected by nuclear disaster, especially the animals in those environments. E...
The one problem with diagnostic imaging is that fear of safety for the long term. Patients normally dont have anything to worry about but occasionally, given the condition and a number of other factors, there is the minimal possibility of some future fallout. The biggest concern is the risk of cancer as a result of exposure to radiation. With the FDA looking for ways to decrease the risks while increasing quality there is also push from MITA (Medical Imaging & Technology Alliance) to do the same.. MITA has published XR 29 Standard Attributes on Computed Tomography (CT) Equipment Related to Dose Optimization and Management. XR 29 is MITAs smart dose; its purpose is to optimize the doses in CT Scanning. This is a great development considering how many statistics are out there giving diagnostic imaging procedures a bad name, focusing on the issues that can result from the tests.. With everything in life there is always a chance that something may go wrong. Medical procedures have never been the ...
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details ...
MP Bios thermoluminescent (XTLD-XBG) dosimeter rings measure ionizing radiation and can be used to determine accurate radiation exposure in the workplace. The ring contains one separate thermoluminescent phosphor for calculating tissue equivalence and determining actual doses of radiation. When the phosphor is heated, the previously absorbed energy from the ionizing radiation is re-emitted in the form of light. The light output is measured, and the dose is calculated. A report is published with a minimal reportable dose of 10mrem.. ...
New screening device provides images with 6 times better contrast of breast tumors and approximately half the radiation dose of standard mammography.
Radiotherapy or radiation therapy is the use of high-energy rays to destroy malignant cells and shrink tumors. It is important to know that this medical procedure attacks the cancer cells only in the treated area. There are two ways of giving this therapy. One, external radiation, in which the radiation comes from a machine, and other, internal radiation, where the cancer cells are found after putting materials that produce radiation into the affected area ...
... is one of the most common treatments for cancer, with about half of all cancer patients receiving some type of radiation. And youre responsible for deciding the best way to aim the radiation at the cancer and for positioning the patient precisely and consistently for every treatment. But more than that, you are with them every step of the way. You allay fears. You instill trust. You make a very difficult situation much easier and become an important part of their lives.. ...
On the average, people in the US are exposed to about 3 millisievert (mSv) of radiation a year - a millisievert is just one type of measurement unit
Moffitt Cancer Center researchers hope to change this mindset for radiation treatment with the development of a genomically-based model that can optimize and personalize a radiation dose to match an individual patients needs.
Article Documented optimum and threshold for ionising radiation. A concept of the complete dose-response curve of ionising radiation will allow us to live in harmony with this ubiquitous agent. Convincing data show ionising radiation is essential for...
We will investigate combined injury by moderate dose radiation in two models in a two- phase study. In the first phase, we will use anonymized surgical samples...
The absorbed dose of radiation is measured in a unit called a gray (Gy). Diagnostic tests that use radiation, such as an X-ray, result in a small dose of radiation - typically well below 0.1 Gy - focused on a few organs or small amount of tissue.. Signs and symptoms of radiation sickness usually appear when the entire body receives an absorbed dose of at least 1 Gy. Doses greater than 10 Gy to the whole body are generally not treatable and usually lead to death within two days to two weeks, depending on the dose and duration of the exposure.. ...
The government is taking steps to help ensure that children who need CT scans and other X-ray-based tests dont get an adult-sized dose of radiation.
...   Radiation therapy (or radiotherapy) is the medical use of ionizing radiation as part of cancer treatment to control malignant cells
|p|Ziehm Vision delivers high-quality imaging with low dose exposure on a footprint of just 0.8 m². It features a compact C-arm and monitor cart with an intuitive touchscreen user interface as well as two 19” flatscreen monitors. It has a high-
This set of slides was created for The Human Body (Advanced Biology) text, and includes the slides and a blood typing kit. This set includes:Human Blood SmearHuman Mouth (Epithelial cells)Human Striated muscleHuman Heart MuscleHuman CerebrumHuman Tonsil w/ lymph nodesHuman LungHuman SkinHuman Skin w/ t.s. hairsHuman StomachHuman Red Bone MarrowHuman TestisHuman Salivary glandHuman SpermatazoaHuman Bone Tissue Human Liver TissueBlood Typing Kit Apologia Advanced Biology Slides with Blood Typing Kit
Researchers discovered that microscopic bubbles are safe and effective storage lockers for harmful isotopes that emit ionizing radiation for treating tumors. The findings can benefit patient health and advance radiation therapy used to treat cancer and other diseases.
Radiation for breast cancer is painless, but side effects vary from person to person-you may experience none or several. Regardless, most are temporary, controllable and disappear after your treatment has ended. Here are a few of the more common side effects of radiation and how to handle them.Fatigue: Youll feel like you dont have any energy and are tired all the time.