Diffusion-weighted MRI of urinary bladder and prostate cancers
... important in the assessment of disease response to treatment methods. Conventional assessment by measuring lesion size is insensitive to early treatment-related changes (22). The present study has several potential limitations. First, the patient population was relatively small. Second, not all of t ...
... important in the assessment of disease response to treatment methods. Conventional assessment by measuring lesion size is insensitive to early treatment-related changes (22). The present study has several potential limitations. First, the patient population was relatively small. Second, not all of t ...
Honored Lecture 2012 du RSNA congrès
... female radiology residents since 2003, according to a recent survey. The total number of residents increased 29 percent during that time. Read more on Page 20. ...
... female radiology residents since 2003, according to a recent survey. The total number of residents increased 29 percent during that time. Read more on Page 20. ...
Prediction of respiratory tumour motion for real-time image
... 2002, Berbeco et al 2004). The x-ray images are generally taken at a constant frequency, with each image providing the location of the tumour at a certain instant in time. After the image is taken, but before the radiation beam can target the tumour at its new location, there is always a system late ...
... 2002, Berbeco et al 2004). The x-ray images are generally taken at a constant frequency, with each image providing the location of the tumour at a certain instant in time. After the image is taken, but before the radiation beam can target the tumour at its new location, there is always a system late ...
Diffusion Tensor Imaging and Tractography Technical Considerations
... of T2 and T2* image contrast that occurs with extended EPI echo trains.12,13 Moreover, due to the shorter readout, the TE may be decreased; this decrease has the effect of improving SNR and further reducing susceptibility and off-resonance artifacts as well as T2 shinethrough (Figs 3 and 4). These s ...
... of T2 and T2* image contrast that occurs with extended EPI echo trains.12,13 Moreover, due to the shorter readout, the TE may be decreased; this decrease has the effect of improving SNR and further reducing susceptibility and off-resonance artifacts as well as T2 shinethrough (Figs 3 and 4). These s ...
Evaluation of the combined effects of target size, respiratory motion
... internal organ motion is significant. However, the best methodology for applying 4D-PET/CT to moving target definition is not currently well understood. With the goal of better understanding how to best apply the 4D information to radiotherapy target definition, in this initial study, we have invest ...
... internal organ motion is significant. However, the best methodology for applying 4D-PET/CT to moving target definition is not currently well understood. With the goal of better understanding how to best apply the 4D information to radiotherapy target definition, in this initial study, we have invest ...
Does Iterative Reconstruction Improve Image Quality and Reduce
... Several studies done between 2012 and 2015 have shown that the use of IR algorithms do indeed aid in reducing radiation dose and improving image quality in CT examinations when compared to the FBP algorithm.6,10 However, there has yet to be any known review published on related studies to establish ...
... Several studies done between 2012 and 2015 have shown that the use of IR algorithms do indeed aid in reducing radiation dose and improving image quality in CT examinations when compared to the FBP algorithm.6,10 However, there has yet to be any known review published on related studies to establish ...
ACR Bulletin January 2011 - American College of Radiology
... unless true added value is generated and proven. If we continue to perpetuate behavior and practice patterns through which we are perceived as ancillary, we will never achieve our goal. Leaders in radiology have told us for decades that we need to emerge from our darkened reading rooms. That advice ...
... unless true added value is generated and proven. If we continue to perpetuate behavior and practice patterns through which we are perceived as ancillary, we will never achieve our goal. Leaders in radiology have told us for decades that we need to emerge from our darkened reading rooms. That advice ...
Managing Patient Dose in Multi-Detector Computed Tomography
... There are a number of new influencing parameters specific to MDCT which systematically increase or decrease patient dose compared to single-detector row CT scanners (SDCT). As in earlier developments in CT, there is potential for dose reduction, but the actual dose reduction depends upon how the sys ...
... There are a number of new influencing parameters specific to MDCT which systematically increase or decrease patient dose compared to single-detector row CT scanners (SDCT). As in earlier developments in CT, there is potential for dose reduction, but the actual dose reduction depends upon how the sys ...
Noninvasive cardiovascular imaging in coronary artery disease
... Coronary calcium score Coronary calcification is seen predominantly in the context of atherosclerosis. Within a coronary artery, the quantity of calcification is closely related to the extent of atherosclerotic plaque burden. Although the burden of coronary calcium tends to be greater in persons exp ...
... Coronary calcium score Coronary calcification is seen predominantly in the context of atherosclerosis. Within a coronary artery, the quantity of calcification is closely related to the extent of atherosclerotic plaque burden. Although the burden of coronary calcium tends to be greater in persons exp ...
Self-Referral CT Screening Application Guide (PDF: 420KB/34pages)
... (ALARA). As an applicant, you should consider the ALARA philosophy in the development of work plans involving your procedure and protocol for CT self-referral screening examinations. The success of an ALARA program depends on the cooperation of each person who works at your facility. Management shou ...
... (ALARA). As an applicant, you should consider the ALARA philosophy in the development of work plans involving your procedure and protocol for CT self-referral screening examinations. The success of an ALARA program depends on the cooperation of each person who works at your facility. Management shou ...
ASFNR Recommendations for Clinical Performance of MR Dynamic
... in spin-echo relaxivity (⌬R2) for all vessel sizes44,45; therefore, GRE DSC-MRI has inherently higher SNR and sensitivity than SE DSC-MRI, providing either greater signal changes with equal contrast agent doses or equal signal changes with reduced contrast agent dose. ⌬R2* is also linear with respec ...
... in spin-echo relaxivity (⌬R2) for all vessel sizes44,45; therefore, GRE DSC-MRI has inherently higher SNR and sensitivity than SE DSC-MRI, providing either greater signal changes with equal contrast agent doses or equal signal changes with reduced contrast agent dose. ⌬R2* is also linear with respec ...
Electronic Posters: Pulse Sequences, Reconstruction
... more image quality improvements for some applications. For example, EPI images suffer from field inhomogeneity artifacts resulting from signal losses in some areas especially around air-tissue interfaces. These artifacts can be minimized with, for example, thin slice thickness. This strategy, howeve ...
... more image quality improvements for some applications. For example, EPI images suffer from field inhomogeneity artifacts resulting from signal losses in some areas especially around air-tissue interfaces. These artifacts can be minimized with, for example, thin slice thickness. This strategy, howeve ...
19 2D and 3D Planning in Brachytherapy
... The greatest benefit when using 3D imaging modalities such as CT, MRI or US for the localization and reconstruction of catheters is that there is no need of identifying and matching of catheters describing markers or points on two different projections, as is the case for the PRM method (Tsalpatouros ...
... The greatest benefit when using 3D imaging modalities such as CT, MRI or US for the localization and reconstruction of catheters is that there is no need of identifying and matching of catheters describing markers or points on two different projections, as is the case for the PRM method (Tsalpatouros ...
chapter 7. clinical treatment planning in external photon
... required for treatment planning purposes and allows for a treatment plan to be properly carried out. The type of gathered data varies greatly depending on the type of treatment plan to be generated (e.g., manual calculation of parallel-opposed beams versus a complex 3D treatment plan with image fusi ...
... required for treatment planning purposes and allows for a treatment plan to be properly carried out. The type of gathered data varies greatly depending on the type of treatment plan to be generated (e.g., manual calculation of parallel-opposed beams versus a complex 3D treatment plan with image fusi ...
Quality Control in Diagnostic Radiology
... diagnostic medical physicist. The diagnostic medical physicist must be knowledgeable in current equipment designs, intended use, and the appropriateness of the various test instruments that may be used in performance evaluation. The diagnostic medical physicist acts as a local expert on Joint Commis ...
... diagnostic medical physicist. The diagnostic medical physicist must be knowledgeable in current equipment designs, intended use, and the appropriateness of the various test instruments that may be used in performance evaluation. The diagnostic medical physicist acts as a local expert on Joint Commis ...
Cone beam computed tomography functionalities in dentistry
... no geometric distortion, and 3D demonstration. It is worth mentioning that, by using a relatively low ionic radiation, CBCT provides a 3D representation from hard tissues along with little information from soft tissues.[6] Common CT systems have similar advantages (in addition to providing informati ...
... no geometric distortion, and 3D demonstration. It is worth mentioning that, by using a relatively low ionic radiation, CBCT provides a 3D representation from hard tissues along with little information from soft tissues.[6] Common CT systems have similar advantages (in addition to providing informati ...
The Influence of Accurate Attenuation Correction - ORCA
... and so will be different in a normal healthy state compared to a diseased state. For example, a cancerous tumour which has an increased rate of cell turnover may take up more of a radiopharmaceutical, than the surrounding healthy tissue. The difference in the number of detected gamma photons from ab ...
... and so will be different in a normal healthy state compared to a diseased state. For example, a cancerous tumour which has an increased rate of cell turnover may take up more of a radiopharmaceutical, than the surrounding healthy tissue. The difference in the number of detected gamma photons from ab ...
Nuclear medicine
Nuclear medicine is a medical specialty involving the application of radioactive substances in the diagnosis and treatment of disease. Nuclear medicine scans are usually conducted by radiographers. Nuclear medicine, in a sense, is ""radiology done inside out"" or ""endoradiology"" because it records radiation emitting from within the body rather than radiation that is generated by external sources like X-rays.