Analytical, Diagnostic and Therapeutic Techniques and Equipment
Subtraction TechniqueAngiography, Digital Subtraction
Subtraction Technique
Combination or superimposition of two images for demonstrating differences between them (e.g., radiograph with contrast vs. one without, radionuclide images using different radionuclides, radiograph vs. radionuclide image) and in the preparation of audiovisual materials (e.g., offsetting identical images, coloring of vessels in angiograms).
Angiography, Digital Subtraction
A method of delineating blood vessels by subtracting a tissue background image from an image of tissue plus intravascular contrast material that attenuates the X-ray photons. The background image is determined from a digitized image taken a few moments before injection of the contrast material. The resulting angiogram is a high-contrast image of the vessel. This subtraction technique allows extraction of a high-intensity signal from the superimposed background information. The image is thus the result of the differential absorption of X-rays by different tissues.

Computed radiography dual energy subtraction: performance evaluation when detecting low-contrast lung nodules in an anthropomorphic phantom. (1/1051)

A dedicated chest computed radiography (CR) system has an option of energy subtraction (ES) acquisition. Two imaging plates, rather than one, are separated by a copper filter to give a high-energy and low-energy image. This study compares the diagnostic accuracy of conventional computed radiography to that of ES obtained with two radiographic techniques. One soft tissue only image was obtained at the conventional CR technique (s = 254) and the second was obtained at twice the radiation exposure (s = 131) to reduce noise. An anthropomorphic phantom with superimposed low-contrast lung nodules was imaged 53 times for each radiographic technique. Fifteen images had no nodules; 38 images had a total of 90 nodules placed on the phantom. Three chest radiologists read the three sets of images in a receiver operating characteristic (ROC) study. Significant differences in Az were only found between (1) the higher exposure energy subtracted images and the conventional dose energy subtracted images (P = .095, 90% confidence), and (2) the conventional CR and the energy subtracted image obtained at the same technique (P = .024, 98% confidence). As a result of this study, energy subtracted images cannot be substituted for conventional CR images when detecting low-contrast nodules, even when twice the exposure is used to obtain them.  (+info)

Relief of obstructive pelvic venous symptoms with endoluminal stenting. (2/1051)

PURPOSE: To select patients for percutaneous transluminal stenting of chronic postthrombotic pelvic venous obstructions (CPPVO), we evaluated the clinical symptoms in a cohort of candidates and in a series of successfully treated patients. METHODS: The symptoms of 42 patients (39 women) with CPPVO (38 left iliac; average history, 18 years) were recorded, and the venous anatomy was studied by means of duplex scanning, subtraction venography, and computed tomography or magnetic resonance imaging. Successfully stented patients were controlled by means of duplex scanning and assessment of symptoms. RESULTS: The typical symptoms of CPPVO were reported spontaneously by 24% of patients and uncovered by means of a targeted interview in an additional 47%. Of 42 patients, 15 had venous claudication, four had neurogenic claudication (caused by dilated veins in the spinal canal that arise from the collateral circulation), and 11 had both symptoms. Twelve patients had no specific symptoms. Placement of a stent was found to be technically feasible in 25 patients (60%), was attempted in 14 patients, and was primarily successful in 12 patients. One stent occluded within the first week. All other stents were fully patent after a mean of 15 months (range, 1 to 43 months). Satisfaction was high in the patients who had the typical symptoms, but low in those who lacked them. CONCLUSION: Venous claudication and neurogenic claudication caused by venous collaterals in the spinal canal are typical clinical features of CPPVO. We recommend searching for these symptoms, because recanalization by means of stenting is often feasible and rewarding.  (+info)

Use of three-dimensional MR angiography for tracking a contrast bolus in the carotid artery. (3/1051)

Contrast-bolus tracking in the carotid bifurcation was accomplished using an MR angiographic technique with a 3D turbo field-echo readout (TR/TE = 6/3, flip angle = 50 degrees) modified by a keyhole scheme. Optimal visibility of the contrast bolus was achieved by digital subtraction from a reference volume. This technique reliably time-resolves the carotid arteries from the jugular veins.  (+info)

Sensitivity and specificity of quantitative difference SPECT analysis in seizure localization. (4/1051)

True ictal SPECT can accurately demonstrate perfusion increases in the epileptogenic area but often requires dedicated personnel waiting at the bedside to accomplish the injection. We investigated the value of perfusion changes as measured by ictal or immediate postictal SPECT in localizing the epileptogenic region in refractory partial epilepsy. METHODS: Quantitative perfusion difference images were calculated by registering, normalizing and subtracting ictal (or immediate postictal) from interictal SPECT for 53 patients with refractory epilepsy. Perfusion difference SPECT results were compared with visually interpreted SPECT, scalp electroencephalography (EEG), MRI, PET and intracranial EEG. RESULTS: In 43 patients (81%), discrete areas of increased perfusion (with ictal injections) or decreased perfusion (with postictal injections) were noted. Interictal scalp EEG was localizing in 28 patients (53%), ictal scalp EEG was localizing in 35 patients (66%) and intracranial EEG was localizing in 22 patients (85%) (of 26 patients who underwent invasive study). MRI was localizing in 34 patients (64%), PET was localizing in 32 of 45 patients (71%), interictal SPECT was localizing in 26 patients (49%) and peri-ictal SPECT (visual interpretation) was localizing in 30 patients (57%). By comparison with an intracranial EEG standard of localization, SPECT subtraction analysis had 86% sensitivity and 75% specificity. CONCLUSION: Our data provide evidence that SPECT perfusion difference analysis has higher sensitivity and specificity than any other noninvasive localizing criterion and can localize epileptogenic regions with accuracy comparable with that of intracranial EEG. To obtain these results, one must apply knowledge of the timing of the ictal injection relative to seizure occurrence.  (+info)

Use of subtraction ictal SPECT co-registered to MRI for optimizing the localization of seizure foci in children. (5/1051)

Ictal SPECT studies are increasingly used to localize seizure foci in children with refractory epilepsy, but few studies have reported on ictal-interictal subtraction images co-registered to MRI at this age. METHODS: Twenty-seven children with partial epilepsy (aged 3 mo-18 y) underwent ictal ethyl cysteinate dimer (ECD) SPECT (20 mCi/1.73 m2) combined with video-electroencephalography (EEG) and interictal ECD SPECT followed 2 d later by three-dimensional MRI. Ictal-interictal and interictal-ictal subtraction images were computed by registering and normalizing the ictal to the interictal SPECT scans for each child. The ictal, interictal SPECT and subtraction images were registered to each child's MRI. Difference images (ictal-interictal) were then superimposed on MRI for anatomic localization of the perfusion changes. Intra- and interobserver reproducibility and "facility of interpretation" of overlay images were compared with standard analysis of the non-coregistered ictal and interictal scans. RESULTS: Overlay images allowed the detection of at least one hyperperfused focus in 93% of the children, compared with 74% using ictal and interictal scans separately. Seizure onset was suspected clinically, on EEG or on MRI in 20 children. Overlay images were concordant (n = 11) or larger (n = 7) than the suspected focus in 18 of 20 (90%), whereas these images failed to show any abnormality in 1 child and were discordant with MRI in another patient. In the remaining 7, images showed cortical localization in 6 patients. Among the 5 patients who underwent electrocorticography, overlay images were concordant in 3, larger in 1 and absent in 1. The intra- and interobserver reproducibility and facility of interpretation were significantly higher using overlay images than standard analysis, even when ictal and interictal SPECT were co-registered. CONCLUSION: The co-registration of ictal-interictal subtraction SPECT images to MRI seems to be a helpful technique in localizing the onset of seizure and guiding the intracranial recording in childhood epilepsy. Moreover, this method improves sensitivity, enhances intra- and interobserver reproducibility and makes interpretation easier.  (+info)

Isolation of novel cDNAs by subtractions between the anterior mesendoderm of single mouse gastrula stage embryos. (6/1051)

The anterior mesendoderm of mid- to late primitive streak stage mouse embryos has the ability to induce anterior neuroectodermal fate in naive epiblast [S.-L. Ang and J. Rossant (1993) Development 118, 139-149]. A number of genes have been found to be expressed in this tissue, notably the transcription factor Lim1. Lim1-null mice have anterior mesendoderm defects that result in a lack of head formation. Thus, the anterior mesendoderm of gastrula stage mouse embryos should express Lim1-regulated genes that are essential for head development. To identify Lim1-regulated genes, a differential screen with subtraction was developed, using cDNA pools that were amplified from the anterior mesendoderm of single wild-type and Lim1-null gastrula stage embryos. This novel screen strategy has yielded 22 cDNAs that show differential expression between anterior mesendoderm cells of wild-type and Lim1-null embryos. The expression of one novel cDNA SII6 initially colocalizes with Lim1 in the anterior mesendoderm of gastrula stage embryos. Moreover, SII6 expression is undetectable in the anterior mesendoderm of Lim1-null embryos. This screen identifies a set of putative Lim1 target genes that may have important roles in vertebrate head formation. Furthermore, this differential screen strategy should provide a broadly applicable approach to identify differences in gene expression between embryonic tissues of limiting quantity.  (+info)

Challenges associated with the incorporation of digital radiography into a picture archival and communication system. (7/1051)

Digital radiography (DR) has recently emerged as an attractive alternative to computed radiography (CR) for the acquisition of general radiographic studies in a digital environment. It offers the possibility of improved spatial and contrast resolution, decreased radiation dose due to improved efficiency of detection of x-ray photons, and perhaps most importantly, holds out the promise of increased technologist productivity. To achieve maximum efficiency, DR must be completely integrated into existing information systems, including the hospital and radiology information systems (HIS/RIS) and, when present, the picture archival and communication system (PACS). The early experience with the integration of DR at the Baltimore Veterans Affairs Medical Center (VAMC) has identified several challenges that exist to the successful integration of DR. DR has only recently been defined as a separate Digital Imaging and Communications in Medicine (DICOM) modality and images obtained will, at first, be listed under the category of CR. Matrix sizes with some DR products on the market exceed the current size limitations of some PACS. The patient throughput may be substantially greater with DR than with CR, and this in combination with the larger size of image files may result in greater demands for network and computer performance in the process of communication with the HIS/RIS and PACS. Additionally, in a hybrid department using both CR and DR, new rules must be defined for prefetching and display of general radiographic studies to permit these examinations to be retrieved and compared together. Advanced features that are planned for DR systems, such as dual-energy subtraction, tomosynthesis, and temporal subtraction, will likely require additional workstation tools beyond those currently available for CR.  (+info)

Identification of differentially methylated sequences in colorectal cancer by methylated CpG island amplification. (8/1051)

CpG island methylation has been linked to tumor suppressor gene inactivation in neoplasia and may serve as a useful marker to clone novel cancer-related genes. We have developed a novel PCR-based method, methylated CpG island amplification (MCA), which is useful for both methylation analysis and cloning differentially methylated genes. Using restriction enzymes that have differential sensitivity to 5-methyl-cytosine, followed by adaptor ligation and PCR amplification, methylated CpG rich sequences can be preferentially amplified. In a model experiment using a probe from exon 1 of the p16 gene, signal was detected from MCA products of a colorectal cancer cell line but not in normal colon mucosa. To identify novel CpG islands differentially methylated in colorectal cancer, we have applied MCA coupled with representational difference analysis to the colon cancer cell line Caco2 as a tester and normal colon mucosa as a driver. Using this strategy, we isolated 33 differentially methylated DNA sequences, including fragments identical to several known genes (PAX6, Versican, alpha-tubulin, CSX, OPT, and rRNA gene). The association of hypermethylation of the clones obtained and transcriptional suppression in colorectal cancer was confirmed by examining the Versican gene, which we found to be silenced in methylated cell lines and reactivated by the methylation inhibitor 5-aza-2'-deoxycytidine. We therefore propose that MCA is a useful technique to study methylation and to isolate CpG islands differentially methylated in cancer.  (+info)

In radiology, the Subtraction Technique is a method used in imaging (like X-ray or MRI) that involves digitally subtracting two images taken at different contrasts to better highlight and distinguish specific structures, typically vessels or tissues, from surrounding areas.

The "subtraction technique" is not a widely recognized or established term in medical terminology. It may refer to various methods used in different medical contexts that involve subtracting or comparing measurements, values, or observations to diagnose, monitor, or treat medical conditions. However, without more specific context, it's difficult to provide an accurate medical definition of the term.

In radiology, for example, the subtraction technique is a method used in imaging to enhance the visibility of certain structures by digitally subtracting one image from another. This technique is often used in angiography to visualize blood vessels more clearly.

Therefore, it's essential to provide more context or specify the medical field when using the term "subtraction technique" to ensure accurate communication and understanding.

Digital Subtraction Angiography (DSA) is a specialized medical imaging technique that uses digital radiographic technology to selectively subtract bone structures from sequential X-ray images of vasculature, enhancing the visibility of contrast-enhanced blood vessels and facilitating diagnosis and intervention of vascular diseases.

Digital subtraction angiography (DSA) is a medical imaging technique used to visualize the blood vessels and blood flow within the body. It combines the use of X-ray technology with digital image processing to produce detailed images of the vascular system.

In DSA, a contrast agent is injected into the patient's bloodstream through a catheter, which is typically inserted into an artery in the leg and guided to the area of interest using fluoroscopy. As the contrast agent flows through the blood vessels, X-ray images are taken at multiple time points.

The digital subtraction process involves taking a baseline image without contrast and then subtracting it from subsequent images taken with contrast. This allows for the removal of background structures and noise, resulting in clearer images of the blood vessels. DSA can be used to diagnose and evaluate various vascular conditions, such as aneurysms, stenosis, and tumors, and can also guide interventional procedures such as angioplasty and stenting.

Addition and SubtractionSpectralAngiographyDetectionDiagnosisContrast-enhancedDigitalSensitivityArtifactsUltrasonographyAlgorithmsEstimationVascularMethodDescriptorResultsParathyroidBrainRootInvolvesTumorImageStrategiesVideoSurgical techniquesEstimateDataImagesNoiseMeasurementCharacteristicsEasyLearnComputerIntroducesGeneralShownEarlyBackgroundPatientsApplyWorkReports
Addition and Subtraction2
  • This math workout app contains some amazing mental math and Vedic maths tricks on addition and subtraction, multiplication, percentages etc that will help you learn math in a visual way. (cafebazaar.ir)
  • Examples, solutions, videos, and songs to help Kindergarten and Grade 1 kids learn to relate counting to addition and subtraction (e.g., by counting on 2 to add 2). (onlinemathlearning.com)
Spectral8
  • Also, I'm going to warn you ahead of time that spectral subtraction didn't work very well for me. (allaboutcircuits.com)
  • Traditional Spectral Subtraction method has been reviewed very well and the relationship with wiener filter is also illustrated. (ej-eng.org)
  • The Spectral Subtraction method has been generalized and the focus is put on reducing noise from speech in single channel signals. (ej-eng.org)
  • The system has been tested with eight different datasets and on an average, 65.27% improvement in SNR (Signal to Noise Ratio) for White Noise using Generalized Spectral Subtraction Method is achieved comparing with Traditional Spectral Subtraction Method. (ej-eng.org)
  • The Generalized Spectral Subtraction method is shown to improve the speech quality and to improve SNR as well. (ej-eng.org)
  • S.F. Boll, "Suppression of acoustic noise in speech using spectral subtraction".IEEE Trans ASSP, vol. 2: 113120, 1979. (ej-eng.org)
  • S.F. Boll, "Suppression of acoustic noise in speech using spectral subtraction. (ej-eng.org)
  • Spectral estimation well as exhibit fewer spectral artifacts as compared to earlier techniques. (lu.se)
Angiography9
  • image matrix 2480 × 1920 pixels) and 3D rotational angiography reconstructions (5 second DSA, subtraction technique) obtained on Axiom Artis zee biplane neuroradiologic angiography equipment using standard protocol. (ajnr.org)
  • In the future, further refinement of imaging techniques is necessary to increase the reliability of small vessel angiography to use this data for risk assessment before stent placement and aneurysm treatment. (ajnr.org)
  • Bone-subtraction techniques have been shown to enhance CT angiography (CTA) interpretation, but motion can lead to incomplete bone removal. (ajnr.org)
  • With the advent of digital subtraction angiography (DSA) in 1980, CO 2 angiography became a useful diagnostic tool, particularly in patients who were hypersensitive to iodinated contrast material or whose renal function was compromised. (medscape.com)
  • Digital subtraction angiography is considered the imaging method of choice. (hindawi.com)
  • Digital subtraction angiography (DSA) is still considered the gold standard among the currently used imaging methods for the diagnosis of an intracranial aneurysm. (hindawi.com)
  • The pioneering accomplishments and vision of Charles A. Mistretta in developing digital subtraction angiography (DSA), timeresolved magnet resonance angiography (MRA), and accelerated imaging algorithms have transformed diagnostic radiology. (nxtbook.com)
  • Digital subtraction angiography (DSA) is a technique that reduces artifacts by subtracting densities created by the overlying bony skull. (aao.org)
  • HlthRes-DB also contains indicators on the availability of the following medical equipment: computed tomography (CT) scanners, magnetic resonance imaging (MRI) units, positron emission tomography (PET) scanners, gamma cameras, digital subtraction angiography units, mammographs, radiation therapy equipment and lithotriptors. (who.int)
Detection6
  • Comparison of panoramic radiography and panoramic digital subtraction radiography in the detection of simulated osteophytic lesions of the mandibular condyle. (ouhsc.edu)
  • The sensitivity of parathyroid lesion detection using this technique was superior to that of ultrasonography. (snmjournals.org)
  • The purpose of this study was to investigate the feasibility of the subtraction technique for double-phase SPECT images to increase the sensitivity of parathyroid lesion detection. (snmjournals.org)
  • Part5: Included MODIS based flood detection by NDWI index though a subtraction change detection techniques. (tutorialspoint.com)
  • There was also no difference on the apical resorption detection, except by the viewer two as to 10º horizontal and vertical angles, who related that on the larger cavity, the digital radiography was more reliable than the subtraction radiography. (bvsalud.org)
  • Dynamic contrast-enhanced MR with subtraction imaging improves the evaluation of managed HCC with easy detection of residual or recurrent viable lesions. (bvsalud.org)
Diagnosis3
  • Thorough understanding of the physical properties of CO 2 and facile catheterization technique are essential in obtaining optimal CO 2 imaging for both diagnosis and intervention. (medscape.com)
  • Mistretta For contributions to network multi-user information theory and for wide-ranging impact on programmable circuit architectures For the development of imaging instrumentation and techniques that have transformed the diagnosis and treatment of vascular disease Abbas El Gamal's lasting contributions to information theory, wireless networks, field programmable gate arrays (FPGAs), and digital imaging have immensely impacted a wide variety of information technology applications critical in today's society. (nxtbook.com)
  • Due to the fact that digital subtraction radiography is an important resource to detect initial mineral changes, this study aimed at evaluating the effectiveness of the digital subtraction radiography and digital radiography in early diagnosis of the simulated apical and lingual external root resorption. (bvsalud.org)
Contrast-enhanced5
  • Our objective was to assess the usefulness of contrast-enhanced subtraction harmonic sonography in evaluating the treatment response of patients with hepatocellular carcinoma. (nih.gov)
  • Results of contrast-enhanced CT were compared with the results of subtraction harmonic imaging. (nih.gov)
  • Digital subtraction contrast-enhanced harmonic imaging can depict tumor vascularity in hepatocellular carcinoma after therapy sensitively and accurately. (nih.gov)
  • 3D TOF MRA and contrast-enhanced MRA are the most commonly employed techniques. (hindawi.com)
  • During the 1990s, Mistretta applied DSA technology to overcome the limitations of slow magnetic resonance data acquisition in contrast-enhanced MRA techniques. (nxtbook.com)
Digital3
  • Incorporating a hand-made, custom-designed digital image processor, Mistretta introduced his DSA technique. (nxtbook.com)
  • The use of digital subtraction technology has enhanced the ability to visualize vascular structures with smaller amounts of contrast dye. (aao.org)
  • A-5: Digital subtraction angiogram obtained during balloon angioplasty of a stenotic artery. (medscape.com)
Sensitivity2
  • Since the introduction of double-phase imaging using this tracer, the technique is currently accepted as the standard examination for patients with hyperparathyroidism because of its acceptable sensitivity and cost-effectiveness ( 5 - 9 ). (snmjournals.org)
  • Several MRA techniques have been developed for overcoming all these drawbacks and for improving its sensitivity. (hindawi.com)
Artifacts1
  • and subtraction, with its potential artifacts ( 12 - 14 ). (snmjournals.org)
Ultrasonography1
  • The results of subtraction SPECT imaging were compared with those of ultrasonography. (snmjournals.org)
Algorithms1
  • Bone-subtraction algorithms with motion compensation provided higher image-quality scores than pure rigid registration methods, especially in cases with complex motion. (ajnr.org)
Estimation3
  • Contact-surface area-based estimation is a similar technique that does not require full segmentation of the tumor on imaging. (urotoday.com)
  • Although many new planting techniques can be used, the estimation of the trunk flare diameter (TFD) could help the planning process to give tree roots more space to grow over the years. (researchgate.net)
  • As the same system is used for both the estimates in various regions, necessitate the development velocity estimation and for forming B-mode images, these of improved techniques able to estimate the blood spec- two transmissions are interleaved. (lu.se)
Vascular2
  • Subtraction quality for the assessment of different vascular segments was evaluated by 2 examiners in a blinded fashion. (ajnr.org)
  • Mistretta recognized the importance that electronic subtraction in imaging could play in providing vascular images that were free of obscuring anatomy. (nxtbook.com)
Method3
  • Bone-subtraction CTA (BSCTA), using a (low-dose) nonenhanced scan to create a bone model, which then is subtracted from the CTA data, 10 - 13 has proved to be a robust method, which can be fully automated, requiring no user interaction. (ajnr.org)
  • A limitation of this method is that complex patient motion between the 2 scans can confound the subtraction process. (ajnr.org)
  • Investigations have reported good results ( 11 , 16 , 17 ), similar in accuracy to the subtraction method, although few direct comparison studies have been reported ( 18 - 20 ). (snmjournals.org)
Descriptor1
  • Subtraction Technique" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus, MeSH (Medical Subject Headings) . (ouhsc.edu)
Results4
  • Our results demonstrate that 2D DSA and 3D-rotation techniques are able to reliably visualize the penetrating branches of the brain stem in vivo. (ajnr.org)
  • It's possible that a more sophisticated implementation would produce better results, and perhaps I'll write another article on spectrum subtraction if I find a way to make it more effective. (allaboutcircuits.com)
  • This means that you have to check for negative subtraction results and change all negative values to zero. (allaboutcircuits.com)
  • These results indicate that computer vision techniques can be effective in quantifying body movement from videos of musical performances, while also highlighting constraints that must be dealt with when applying such techniques in ensemble coordination research. (frontiersin.org)
Parathyroid2
  • Our objective was to investigate the feasibility of subtraction for SPECT images of 99m Tc-MIBI double-phase parathyroid scintigraphy. (snmjournals.org)
  • Different protocols are used for 99m Tc-sestamibi parathyroid scintigraphy, depending on the institutional logistics and experience (classical dual-phase scintigraphy, various subtraction techniques in combination with radioiodine or 99m Tc-pertechnetate). (snmjournals.org)
Brain1
  • Our quick math app will let you be a math master and learn math tricks to improve your calculation skills in a very easy and fun way using addition, subtraction, multiplication, percentage tricks while surfing over the greatest brain challenging math practice app. (cafebazaar.ir)
Root1
  • All participants received full-mouth scaling and root planing, tooth polishing, demonstration of correct brushing technique and a new toothbrush and toothpaste. (who.int)
Involves2
  • Question 1 involves a technique known to mathematicians as subtraction. (boatdesign.net)
  • A Feature Paper should be a substantial original Article that involves several techniques or approaches, provides an outlook for future research directions and describes possible research applications. (mdpi.com)
Tumor2
  • Before therapy, an enhancement pattern of tumor vascularity was seen for 93.8% (30/32) of hepatocellular carcinoma nodules on subtraction harmonic imaging. (nih.gov)
  • After therapy, subtraction harmonic imaging showed 46.7% (14/30) enhancement (incomplete tumor necrosis) and 53.3% (16/30) no enhancement (complete tumor necrosis). (nih.gov)
Image3
  • A subtraction image was obtained by digitally subtracting the last-frame harmonic image from the first-frame image when multishot mode was preset. (nih.gov)
  • A technique is designed to subtract an undesired portion of an image from a given optical scene. (dtic.mil)
  • To eliminate voxels representing bone or calcification in the final image and prevent them from possibly obscuring the visualization of vessels, one may apply bone-subtraction techniques. (ajnr.org)
Strategies1
  • Counting back and counting up are generally the first strategies that students are introduced to when learning subtraction. (onlinemathlearning.com)
Video4
  • Three different computer vision techniques were applied to these video datasets-frame differencing, optical flow, and kernelized correlation filters (KCF)-with the aim of quantifying and tracking movements of the individual performers. (frontiersin.org)
  • One area that offers various promising techniques for extracting features of human movement from video is the field of computer vision ( Moeslund and Granum, 2001 ). (frontiersin.org)
  • This video outlines the basic ideas behind counting back and counting up, as well as introduces several techniques for teaching. (onlinemathlearning.com)
  • This video highlights four techniques that are easy to implement in tomorrow's lesson! (aac.ab.ca)
Surgical techniques2
  • [ 6 ] Preoperative localization studies are increasingly becoming the standard of care, as they enable minimally invasive surgical techniques. (medscape.com)
  • Surgical specialists are doctors who specialise in the use of surgical techniques to treat disorders and diseases. (who.int)
Estimate1
  • The techniques that track movement in two dimensions (optical flow and KCF) provided more accurate measures of movement than a technique that provides a single estimate of overall movement change by frame for each performer (frame differencing). (frontiersin.org)
Data2
  • All three computer vision techniques exhibited high correlations with MoCap data collected from the same musical performances, with median correlation (Pearson's r ) values of 0.75-0.94. (frontiersin.org)
  • This is a short applicable course enables you to learn important techniques on water resource management using earth observation satellite data in Google Earth Engine Platform. (tutorialspoint.com)
Images8
  • 4 We hypothesized that the 3D-rotation technique allows superior visualization of the small branches of the basilar artery than 2D DSA images do. (ajnr.org)
  • The new technique used in the present study allowed the subtraction for SPECT images. (snmjournals.org)
  • However, the subtraction technique is performed on planar images, not on SPECT images. (snmjournals.org)
  • To our knowledge, there have been no previous reports of the subtraction of SPECT images taken at different phases with a single tracer. (snmjournals.org)
  • We developed a new technique for precise subtraction of cervical SPECT images between different phases using a laser beam and maximization of mutual information. (snmjournals.org)
  • The iodine-subtraction virtual unenhanced images were reconstructed using commercial software. (elsevierpure.com)
  • A new imaging technique creates microscopic three-dimensional views of tissues within a patient's body and can update those images several times a second. (sciencenews.org)
  • Hence, one solution is to apply deconvolution techniques to these ground-based images. (epfl.ch)
Noise2
  • This article discusses a technique in which frequency-domain subtraction is used to selectively suppress the noise components in an audio signal. (allaboutcircuits.com)
  • In this article we'll look at a different technique for audio noise reduction. (allaboutcircuits.com)
Measurement1
  • CTA with maximum intensity projection (MIP) and quantitative measurement of stenosis is an accurate noninvasive technique for diagnosing fibromuscular dysplasia/stenosis of the visceral arteries, regardless of the etiology. (medscape.com)
Characteristics2
  • The development of newer MRA techniques may provide valuable information regarding the flow characteristics of an aneurysm. (hindawi.com)
  • DEPOVB: Occlusal characteristics: overbite (mm) Overbite was calculated by subtraction of overlap from crown height. (cdc.gov)
Easy1
Learn1
  • Math Tricks Videos, that will help you easily learn the quick math techniques through animated presentations. (cafebazaar.ir)
Computer2
  • Measurements of performer's movements were also more accurate when the computer vision techniques were applied to more narrowly defined regions of interest (head) than when the same techniques were applied to larger regions (entire upper body, above the chest, or waist). (frontiersin.org)
  • One approach uses thyroid imaging with 99m Tc-pertechnetate or 123 I-sodium iodide concomitantly and computer subtraction techniques. (snmjournals.org)
Introduces1
  • This research work explores the effects of these interfering sounds on speech applications and introduces a technique for reducing their influence and enhancing the acceptability and intelligibility of the speech signal. (ej-eng.org)
General1
  • Schlieren photography is an general set of techniques for visualizing fluid flow, but of course, it can also be applied to airflow. (hackaday.com)
Shown1
  • This technique has been shown to be beneficial in a variety of clinical settings. (ajnr.org)
Early2
  • Lee et al retrospectively enrolled 75 patients who had undergone liver transpalantation and found that although MDCT in the late period should be interpreted with caution in patients with suspected biliary complication, MDCT is a reliable diagnostic technique for the identification of early and late abdominal complications after liver transplantation. (medscape.com)
  • In research with babies, the technique of "preferential looking" has allowed the discovery of sophisticated skills in early ages, among them those of addiction and subtraction. (bvsalud.org)
Background1
  • Background subtraction techniques: a review" (PDF). (wikipedia.org)
Patients2
  • Fifty-four patients underwent bone-subtraction CTA (BSCTA) for the evaluation of the neck vessels with 64-section CT. (ajnr.org)
  • The patient population was composed of 2 groups: 1) patients with symptomatic atherosclerotic disease who underwent an additional low-dose nonenhanced CT scanning (NECT) for subtraction purposes and 2) patients with cancer of the oral cavity/oropharynx who required CTA for surgical planning of reconstructive surgery. (ajnr.org)
Apply1
  • This will involve to apply the existing techniques and to develop new methods to measure time-delays between distorted light-curves. (epfl.ch)
Work1
  • This work introduced the cut-set upper bound for networks, which is widely used in information theory today, as well as the compress-forward and decode-forward schemes, which continue to be the dominant relaying techniques. (nxtbook.com)
Reports1
  • Noted designer Cameron Moll examines the would-be alternative to the sIFR Web typography technique and reports on its relative merits. (subtraction.com)

No images available that match "subtraction technique"