• A phantom used to evaluate an imaging device should respond in a similar manner to how human tissues and organs would act in that specific imaging modality. (wikipedia.org)
  • Purpose: A range of anatomically-realistic multi-modality renal artery phantoms consisting of vessels with varying degrees of stenosis was developed and evaluated using four imaging techniques currently used to detect renal artery stenosis (RAS). (tcd.ie)
  • The spatial resolution required to visualize vascular geometry and the velocity detection performance required to adequately characterize blood flow in patients suffering from RAS is currently ill-defined, with the result that no one imaging modality has emerged as a gold standard technique for screening for this disease. (tcd.ie)
  • Results: High quality distortion-free images of the phantoms with good contrast between vessel lumen, fiducial markers and background tissue to visualize all stenoses were obtained with each modality. (tcd.ie)
  • Such multi-modality phantoms may prove useful in evaluating current and emerging US, MRI, CT and DSA technology. (tcd.ie)
  • Hemispherical tumor detection was similar regardless of the imaging modality used. (elsevier.com)
  • PET is a well-established imaging modality that uses signals emitted by positron-emitting radiotracers to construct images of tracer distribution in vivo (1,2). (redorbit.com)
  • The existing clinical imaging methods are capable of visualizing a thrombus but cannot determine the age of the blood clot. (spiedigitallibrary.org)
  • PURPOSE: Several image-based retrospective sorting methods of 4D magnetic resonance imaging (4D MRI) have been proposed for respiratory motion reconstruction in external beam radiotherapy. (edu.au)
  • This study presents a proactive comparison of three published image-based sorting methods, to define a groundwork for benchmarking in 4D MRI. (edu.au)
  • METHODS: Three published 4D MRI methods were selected for image retrospective sorting: body area, mutual information, and navigator slice. (edu.au)
  • The three image-based methods were compared against a conventional retrospective sorting method based on an external surrogate. (edu.au)
  • CONCLUSIONS: A comparison between three different image-based retrospective sorting methods for 4D MRI is proposed, providing guidelines for benchmark definition in MRI-guided radiotherapy. (edu.au)
  • Methods: We used polyvinyl chloride (PVC) based materials and a 3D printing technique to construct a breast phantom. (elsevier.com)
  • METHODS: This was an in-vitro phantom validation study. (ox.ac.uk)
  • Methods: A series of breast CT images along the coronal plane from a patient who has breast calcifications are used as the source images. (iitkgp.ac.in)
  • The value of a standardized simulation phantom to test and compare reconstruction methods for cardiac imaging has become evident during last years. (ismrm.org)
  • As there has been increased interest in recent years in more efficient data collection efficiencies for MRI, in which the data are not collected on a Cartesian grid, there has been a corresponding increased interest in methods for measuring the actual gradient output, with the purpose of providing corrections to improve the fidelity of the resulting image. (mdpi.com)
  • Increase in usage of novel advanced diagnostic tests such as PET and SPECT and rise in prevalence of various chronic diseases are anticipated to drive the nuclear imaging phantoms segment during the forecast period. (transparencymarketresearch.com)
  • The statistical nature of SPECT imaging, due to Poisson noise effect, results in degradation of image quality, especially in case of lesions of small signal-to-noise (SNR) ratio (small size, reduced activity). (elsevier.com)
  • In this paper, the performance of a platelet de-noising method applied, by means of a pre- processing step, on myocardial perfusion SPECT imaging is evaluated. (elsevier.com)
  • In conclusion, platelet de-noising prior to reconstruction has the potential to provide an efficient means of improving image quality in myocardial perfusion SPECT phantom. (elsevier.com)
  • While OI generally detects low energy light (visible or near-infrared light) emitted from bioluminescence or fluorescence probes, radioactive molecular probes are traditionally imaged with PET, SPECT or gamma (γ) cameras that detect high energy γ rays . (plos.org)
  • In micro-SPECT/CT imaging, the micro-CT unit is mainly used to produce a localization frame. (osti.gov)
  • We aimed at reviewing design and realisation of perfusion/flow phantoms for validating quantitative perfusion imaging (PI) applications to encourage best practices. (springeropen.com)
  • Furthermore, increasing number of clinical trials by universities and institutes for improving the accuracy of phantoms for various disorders such as solid tumors is expected to positively affect the market growth. (grandviewresearch.com)
  • Clinical calcium scoring resulted in overestimation of calcium volume for medium and high density calcifications in the first phantom, and overestimation of calcium volume for high density and underestimation for low density calcifications in the second phantom. (rug.nl)
  • Compared with clinical calcium scoring, proposed quantification provides a better estimate of the true calcium volume in phantoms and better agreement in calcium scores between different subject scan reconstructions. (rug.nl)
  • When evaluating dual-energy CT technology for implementation into a routine clinical pediatric imaging practice, the radiation dose implications must be considered, and when comparing relative CT dose performance, image quality must also be evaluated. (springer.com)
  • We scanned the head, chest and abdomen regions of pediatric-size anthropomorphic phantoms with contrast inserts, using our optimized single-energy clinical imaging protocols on a Siemens Flash® CT scanner. (springer.com)
  • With a better understanding of the dose consequences of converting single-energy protocols to dual-energy protocols we can begin to implement clinical dual-energy CT and utilize its unique capabilities in pediatric imaging. (springer.com)
  • From a clinical standpoint, this area is the best location to obtain diagnostic images. (conquestimaging.com)
  • The aim of this work is to build a phantom suitable to characterize the behavior of gold nanoparticles (GNPs) using magnetic resonance imaging (MRI) in a clinical scanner. (theiet.org)
  • Prior to testing on clinical subjects the fully automated instrument and the reconstruction software are evaluated with tissue-equivalent phantoms. (ucl.ac.uk)
  • A cardiac phantom, containing two different size cold lesions, was utilized to evaluate the platelet de-noising method performance and compare it with the performance of the Butterworth filtering method, applied on raw data in pre-processing fashion, as well as on reconstructed data, representing the clinical routine. (elsevier.com)
  • It provides a new molecular imaging strategy and will likely have significant impact on both small animal and clinical imaging. (plos.org)
  • A practical challenge to be solved: what can be the role of virtual (phantom based) clinical trials with new technology? (eutempe-rx.org)
  • Investigators are encouraged to adopt efforts on phantom validation, including verification with clinical data. (springeropen.com)
  • Purpose: To develop a scalable, multichannel ultrasonic thermometry system suitable for imaging clinical-beam dose distributions in a water phantom. (osti.gov)
  • To overcome the limitations associated with current biomedical imaging techniques, we aim to use new imaging technology at clinical X-ray energy ranges, with the inclusion of monoclonal antibody-functionalised gold nanoparticles. (hindawi.com)
  • 7) first described the prototype PET/ CT scanner used in clinical imaging that precisely and simultaneously coregisters functional data from PET and anatomic images from CT. (redorbit.com)
  • The main requirements for these phantoms are to be geometrically accurate, compatible with magnetic resonance imaging (MRI) and to be composed of materials that approximate the acoustic and thermal properties of the replicated tissues. (city.ac.uk)
  • The present invention relates to a phantom having optical characteristics, in particular light-scattering characteristics, that are similar to those of living tissues. (google.com)
  • Additionally, we evaluated image quality using visual assessment and contrast-to-noise ratio. (springer.com)
  • Signal alterations, artifacts and image distortion induced by a superparamagnetic contrast medium. (lu.se)
  • In a phantom study using a 0.3 tesla MR system the signal alterations, artifacts and image distortion induced by a bowel contrast medium containing superparamagnetic magnetite particles were evaluated. (lu.se)
  • The high dynamic range shows significant detail, especially in high-contrast environments, while the low noise is particularly beneficial when analyzing the dark regions of an image. (dpreview.com)
  • A phantom study was used to assess the efficacy of PASP-IO as a T2-weighted MRI contrast agent. (redorbit.com)
  • This work was supported, in part, by the Department of Radiology, Stanford University (to Z.C.), a China Scholarship Council fellowship (to H.L.), the National Cancer Institute (NCI) In Vivo Cellular Molecular Imaging Center (ICMIC) grant P50 CA114747 (to S.S.G.), and R01 CA119053 (to Z.C.). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. (plos.org)
  • Pooja Rao, Ph.D. , co-founder of Qure.AI and head of research and development for the company, explains how the company's artificial intelligence (AI) -based auto detection software can be used to analyze radiology images. (itnonline.com)
  • To compare the detection of microcalcifications on mammograms of an anthropomorphic breast phantom acquired by a direct digital flat-panel detector mammography system (FPM) versus a stereotactic breast biopsy system utilizing CCD (charge-coupled device) technology with either a 1024 or 512 acquisition matrix (1024 CCD and 512 CCD). (hindawi.com)
  • Results: The 3D-printed breast phantom had an average background value of 36.2 HU, which is close to that of glandular breast tissue (40 HU). (elsevier.com)
  • Conclusions: We developed a multi-purpose breast phantom using a 3D printing technique and determined its value for multi-modal breast imaging studies. (elsevier.com)
  • The thermal conductivity of the brain phantom was estimated to be 0.52 ± 0.06 W/mº-C and 0.57 ± 0.10 W/mº-C for the muscle/breast phantom. (city.ac.uk)
  • EEGs provide millisecond measurements of brain activity, though they do not pinpoint active areas as precisely as other techniques, such as functional magnetic resonance imaging (fMRI). (kurzweilai.net)
  • In this paper we propose a web-based approach for quick visualization of big data from brain magnetic resonance imaging (MRI) scans using a combination of an automated image capture and processing system, nonlinear embedding, and interactive data visualization tools. (frontiersin.org)
  • NIST engineer Katy Keenan holds a new phantom that will help standardize magnetic resonance imaging (MRI) of the breast. (nist.gov)
  • Geometric distortion is a major shortcoming of magnetic resonance imaging (MRI), which has an important influence on the accuracy of volumetric measurements, an important parameter in neurology and oncology. (ac.ir)
  • Fabrication of New 3D Phantom for Measuring Geometric Distortion in Magnetic Resonance Imaging System', Iranian Journal of Medical Physics , 15(Special Issue-12th. (ac.ir)
  • Shurche, S., Riahi Alam, N., Yousefi Sooteh, M. Fabrication of New 3D Phantom for Measuring Geometric Distortion in Magnetic Resonance Imaging System. (ac.ir)
  • Recently, gradient performance and fidelity has become of increasing interest, as the fidelity of the magnetic resonance (MR) image is somewhat dependent on the fidelity of the gradient system. (mdpi.com)
  • In modern magnetic resonance imaging (MRI) instruments, the fidelity of the MR image is dependent upon the fidelity of the gradient system, such that the actual gradient outputs closely match the requested outputs. (mdpi.com)
  • Our goal is to design and construct a new three- dimensional phantom using a 3D printer in order to measure geometric distortion and its reproducibility in three dimensions. (ac.ir)
  • Reproducibility on the phantom was investigated with three different imaging sessions per day for three different days. (ac.ir)
  • Light from a single-mode fiber is relayed obliquely onto the tissue with a gradient index lens-based distal optics assembly and the resulting diffuse reflectance profile is imaged and collected with a 30,000 element, 0.72 mm clear aperture fiber bundle. (spiedigitallibrary.org)
  • The Phantom Menace at 15 was originally published as a postscript to my Q&A column - I'm reprinting it here as its own beast because it got a pretty good reaction and there's no reason to bury it in the back pages. (galactichunter.com)
  • Hasbro expanded upon The Phantom Menace Celebration scene finale where we witness little Ani in full Padawan garb. (galactichunter.com)
  • Next, requirements for designing optical phantoms for validation of small endoscopic instrumentation is presented including a discussion on the diffuse and sub-diffuse scattering regimes and how this relates to common types of epithelial tissue. (spie.org)
  • the phantom comprises a box containing two mechanically resistant "punch‐balloon" lungs, and an ex-vivo human spine preserved by conservation liquid. (opensourceimaging.org)
  • Growing prevalence of disorders such as cardiac failure, various types of cancer, and chronic disorders, is expected to play a key role in the rising demand for advanced phantoms. (grandviewresearch.com)
  • The second phantom was scanned three times without and with simulated cardiac motion (10 and 30 mm/s). (rug.nl)
  • He explains the impact if COVID-19 (SARS-CoV-2) on the cardiovascular service line and cardiac imaging. (itnonline.com)
  • A spoiled gradient recalled (SPGR) pulse sequence was used to produce phase images that were analyzed using a custom coded software developed in Matlab that employed proton-resonance frequency shift (PRFS) thermometry. (city.ac.uk)
  • The final composite phantoms were fabricated by molding the agar based soft tissue phantoms inside/around the ABS bone phantoms. (city.ac.uk)
  • 6. The spine phantom of claim 5 , further comprising a sheet layer affixed to the block, the sheet layer attenuating x-rays differently than the block, the sheet layer and block together having x-ray attenuation characteristics simulating human soft tissue. (google.com)
  • Purpose: To develop a tool enabling soft tissue based image guidance using dual energy radiographs for cases when on-board CT is not available. (osti.gov)
  • Using a weighted logarithmic subtraction of these dual energy images, a soft tissue enhanced and a bone enhanced image were generated and they could be used for the image guidance purpose. (osti.gov)
  • Results: The soft tissue enhanced images suppressed bones (ribs and scapula) overlying on lung, thus enabling a better visualization of soft tissue and lesion, while the bone enhanced image suppressed the soft tissue. (osti.gov)
  • The phantom incorporates structures imaged in the female breast such as microcalcifications, fiber lesions, and tumors with different sizes. (elsevier.com)
  • Method: Dual energy planar radiographs can be applied to image guidance for targeting lung lesions because the bone based alignment only may not be sufficient as the lesions move. (osti.gov)
  • By using these tests periodically we are able to evaluate degradation of image quality over time as well as test the quality during a service call. (conquestimaging.com)
  • Our study further evaluated a variety of radionuclides (β + , β − and γ emitters) for optical imaging. (plos.org)
  • The present study was conducted with the aim of designing a liver phantom for dosimetry. (ac.ir)
  • For the purpose of the study, a real liver tissue was converted into a phantom based on thegram-molecular weight of the components of human liver tissue, mass percentage, and density, and then simulated by MCNPX code for dosimetry. (ac.ir)
  • The Phantom II was initially envisioned as an all-weather attack platform and began as a McDonnell company study project. (militaryfactory.com)
  • In this study, we designed a new phantom containing 13,824 reference features (control points) with AutoCAD software, fabricated it with a 3D printer, and filled it with vegetable oil. (ac.ir)
  • Also, this phantom can be used to study geometric distortion in scenarios that require a small study volume, such as prostate studies. (ac.ir)
  • The present study reports the future potential of spectral molecular imaging in detecting tumour heterogeneity so that treatment can be tuned accordingly, leading to more effective personalised medicine. (hindawi.com)
  • We present a framework which enables realistic 3-D digital phantoms of organs such as the brain and heart to be constructed from polyhedra which have an analytical Fourier transform. (ismrm.org)