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Slide 1
Slide 1

... technologies (2D vs 3D, Radiography vs CT vs Fluoroscopy)? What are the two major types of MRI images (T1, T2), and how are they different? How are Angiograms produced (both Xray and MRI)? Why are the advantages of combining imaging modalities? ...
quantitative nuclear medicine imaging: concepts
quantitative nuclear medicine imaging: concepts

... efforts to the filling of these gaps. As a result, many efficient methods are now available that make quantification a clinical reality, provided appropriate compensation tools are used. Despite these efforts, many clinical institutions still lack the knowledge and tools to adequately measure and es ...
18F FDG PET/CT Evaluation of Patients with Ovarian Carcinoma
18F FDG PET/CT Evaluation of Patients with Ovarian Carcinoma

... The results in our study showed a lower sensitivity of 81% for lesions in the pelvis compared to 96% for disease in other sites. This difference is likely due to post-surgical and post-treatment induced inflammatory uptake within the pelvis. This hypothesis is supported by a study (32) showing that ...
Medical Physics Personnel for Medical Imaging Requirements
Medical Physics Personnel for Medical Imaging Requirements

... The SFPM has long been aware of the shortage in France of the human resources in medical physics required to apply the principle of optimisation and perform all the associated tasks, and this shortage can have a significant impact on patient radiation protection, particularly in medical imaging appl ...
Cone Beam Ct for Dental and Maxillofacial Radiology
Cone Beam Ct for Dental and Maxillofacial Radiology

... areas of medicine. New applications of CT, sometimes in areas where they were hardly expected, are still coming into existence today. One example of such innovative use of CT is the development of the Cone Beam Computed Tomography (CBCT) designed to meet the needs of dental practice. The development ...
J.Nuc.Med.Tech 28/4
J.Nuc.Med.Tech 28/4

... reconstructed image in multiple planes and to separate overlapping structures may obviate the need for multiple images. A potential further advantage of SPECT scanning lies in improved quantification of cardiac function, for tumor/organ volume determination, and for the quantification of radioisotop ...
Diagnostic Value of Only F-fluorodeocyglucose Positron Emission
Diagnostic Value of Only F-fluorodeocyglucose Positron Emission

... patients (29%) out of 702 nodal levels in 114 patients. The mean age of patients with only a PET/CT–positive LN was 62.1 years (range, 21-85 years), including 27 men and 6 women. Among the patients with only PET/CT–positive LNs, 16 primary tumors were localized in the oral cavity, 8 in the oropharyn ...
EAE- MRI in patients with ascending aortic dilation
EAE- MRI in patients with ascending aortic dilation

... Imaging of the thoracic aorta is the only method to detect thoracic aortic diseases and determine risk for future complications. Radiologic imaging technologies have improved in terms of accuracy of detection of TAD. However, increased use of these technologies increases the potential risk associate ...
Wilms Tumor: Imaging of Pediatric Renal Masses
Wilms Tumor: Imaging of Pediatric Renal Masses

... expands within the renal parenchyma to displace and distort the pelvicalyceal system. ...
MotionFree - GE Healthcare
MotionFree - GE Healthcare

... for PET attenuation correction. The ability to properly register the PET and CT images for a more effective attenuation correction (CTAC) significantly contributes to reduce the artifact associated with patient motion. This is especially the case for image artifacts caused by cardiac motion. In the c ...
Identification of Venous Signal on Arterial Spin Labeling Improves
Identification of Venous Signal on Arterial Spin Labeling Improves

... venous system can be a sign of small shunting vascular malformations, and incorporating this information leads to a better clinical assessment. This is important, because while angiography in proper hands is not a high-risk procedure, it is time- and personnel-intensive and can cause patient discomf ...
Ce document est le fruit d`un long travail approuvé
Ce document est le fruit d`un long travail approuvé

... - Discussion et conlcusions……………………………………………………………………………………….. 47 CHAPITRE 2 – LA TOMODENSITOMETRIE………………………………………………………………………….. 48 - Article 1 : Dose reduction in musculoskeletal CT: Tips and Tricks……………………………. 50 - Article 2 : Imaging follow-up of patients with osteoid osteomas after percutaneous ...
Role of 18F-fluorodeoxyglucose positron emission tomography
Role of 18F-fluorodeoxyglucose positron emission tomography

... and the majority of patients with early stage CTCL seem to have unremarkable imaging studies. Kumar et al. (2006) [23] also compared CT and 18F-FDG PET in the evaluation of PCLs. They retrospectively analyzed 31 pairs of 18F-FDG PET and CT scans performed within 1 month of each other in 19 patients ...
Diffusion tensor imaging of white matter pathology in the mouse brain
Diffusion tensor imaging of white matter pathology in the mouse brain

... teristics of disease processes. It is also difficult to use histology to perform comprehensive ana­lysis of neuropathology. For example, quantification of axonal density and lesion volume using his­ tology can be labor intensive and time consum­ ing. Quantitative noninvasive imaging markers that can ...
ICD Registry™ v2.2 - Integrating the Healthcare Enterprise (IHE)
ICD Registry™ v2.2 - Integrating the Healthcare Enterprise (IHE)

... Standardize report organization and representation of clinical information • Organize content that is familiar for clinicians • Looking to provide electronic equivalent of existing hardcopy reports Patient Care Use Case Report generated to document the imaging exam/procedure for consumption by CVIS ...
Society of Nuclear Medicine Procedure Guideline
Society of Nuclear Medicine Procedure Guideline

... These guidelines are an educational tool designed to assist practitioners in providing appropriate care for patients. They are not inflexible rules or requirements of practice and are not intended, nor should they be used, to establish a legal standard of care. For these reasons and those set forth ...
Evaluation of fluorodeoxyglucose positron emission tomography in
Evaluation of fluorodeoxyglucose positron emission tomography in

... distant site. There were nine (39.1%) isolated local recurrences and five (21.7%) isolated lung metastases. Eight patients (34.7%) had lung metastases combined with other sites of recurrence and one (4.3%) had isolated distant metastases at sites other than the lung. Not all these patients had FDG P ...
IAEA-PGEC-VIII.3P1Equipm_b - International Atomic Energy Agency
IAEA-PGEC-VIII.3P1Equipm_b - International Atomic Energy Agency

... Computed Tomography (CT) was introduced into clinical practice in 1972 and revolutionized X Ray imaging by providing high quality images which reproduced transverse cross sections of the body. Tissues are therefore not superimposed on the image as they are in conventional projections The technique o ...
Delivery accuracy of image guided radiation therapy using Elekta
Delivery accuracy of image guided radiation therapy using Elekta

... treatment plan; the tick marks on the horizontal and vertical axes represent 1 cm intervals in the plane of isocenter. (Right) Screen capture of the corresponding MV port film. The white dots denote 1 cm intervals in the plane of isocenter. .......................36 Figure 2.19: (Left) Screen captur ...
Flash speed. Lowest dose. - VCU Department of Radiology
Flash speed. Lowest dose. - VCU Department of Radiology

... Under most frequent conditions, conventional single source cardiac CT depends upon high dose except with extremely stable and low heart rates. For routine cases, however, the dose required in less than ideal circumstances is significantly higher than cardiac cath, that normally requires at least 5 m ...
Reporting Standards for Percutaneous Thermal
Reporting Standards for Percutaneous Thermal

... then use CT to perform precise final positioning. When multitined expandable electrode systems are used for RF ablation, final tine position before the application of RF energy should be verified with imaging. The imaging modality used for initial applicator placement will usually be the same modali ...
Full PDF - American Journal of Physiology
Full PDF - American Journal of Physiology

... from technetium-99m (99mTc) are lost after passing through 4.5 cm of soft tissue (87). Scatter and attenuation are therefore not uniform throughout the body, causing distortion of the image. Quantitative SPECT requires that measurements are corrected for these image-degrading factors (Fig. 1) (5, 62 ...
Physiological imaging of the lung: single-photon
Physiological imaging of the lung: single-photon

... from technetium-99m (99mTc) are lost after passing through 4.5 cm of soft tissue (87). Scatter and attenuation are therefore not uniform throughout the body, causing distortion of the image. Quantitative SPECT requires that measurements are corrected for these image-degrading factors (Fig. 1) (5, 62 ...
Accuracy of 18F-fluorodeoxyglucose Positron Emission Tomography
Accuracy of 18F-fluorodeoxyglucose Positron Emission Tomography

... which was related to anastomotic site uptake. The increase in 18F-FDG uptake of the anastomotic site is often a diagnostic dilemma as local inflammation or post-treatment changes could demonstrate SUVmax overlapping with that of local recurrence.10 This finding should therefore be interpreted with c ...
Radiation Dose and Image Quality in Computed
Radiation Dose and Image Quality in Computed

... ABSTRACT ............................................................................................................... iii ...
< 1 ... 25 26 27 28 29 30 31 32 33 ... 173 >

Image-guided radiation therapy

Image-guided radiation therapy (IGRT) is the process of frequent two and three-dimensional imaging, during a course of radiation treatment, used to direct radiation therapy utilizing the imaging coordinates of the actual radiation treatment plan. The patient is localized in the treatment room in the same position as planned from the reference imaging dataset. An example of IGRT would include localization of a cone beam computed tomography (CBCT) dataset with the planning computed tomography (CT) dataset from planning. IGRT would also include matching planar kilovoltage (kV) radiographs or megavoltage (MV) images with digital reconstructed radiographs (DRRs) from the planning CT. These two methods comprise the bulk of IGRT strategies currently employed circa 2013.This process is distinct from the use of imaging to delineate targets and organs in the planning process of radiation therapy. However, there is clearly a connection between the imaging processes as IGRT relies directly on the imaging modalities from planning as the reference coordinates for localizing the patient. The variety of medical imaging technologies used in planning includes x-ray computed tomography (CT), magnetic resonance imaging (MRI), and positron emission tomography (PET) among others. The precision of IGRT is significantly improved when N-localizer technology is used in conjunction with these medical imaging technologies. Through advancements in imaging technology, combined with a further understanding of human biology at the molecular level, the impact of IGRT on radiotherapy treatment continues to evolve.
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