Full Text - Digital Access to Scholarship at Harvard
... In this era of modern technology, we sometimes forget the value of ‘basic’ techniques applied in a continent with a huge cardiovascular morbidity and mortality: Africa. Mocumbi et al. [22] discussed the potential of echocardiography to foster research into cardiovascular neglected diseases in Africa ...
... In this era of modern technology, we sometimes forget the value of ‘basic’ techniques applied in a continent with a huge cardiovascular morbidity and mortality: Africa. Mocumbi et al. [22] discussed the potential of echocardiography to foster research into cardiovascular neglected diseases in Africa ...
Adjusting kV to Improve Image Quality or Reduce Radiation Dose
... Future of Low kV Imaging • 100 kV can be practically implemented already in most patients – Task-specific technique charts will include kV and mAs selection to perform most dose-efficient exam – 140 kV imaging may be most dose-efficient for large pts ...
... Future of Low kV Imaging • 100 kV can be practically implemented already in most patients – Task-specific technique charts will include kV and mAs selection to perform most dose-efficient exam – 140 kV imaging may be most dose-efficient for large pts ...
comparison of localization performance with implanted fiducial
... patient. The imaging geometry consists of a 100 cm source-to-axis distance (SAD), and a 153-cm source-to-detector distance (SDD), which yields a magnification factor of 1.53. A technique of 120 kVp, 100 mA, 20 ms per exposure for a charge of 2 mAs per projection, was used. The imaging dose delivered ...
... patient. The imaging geometry consists of a 100 cm source-to-axis distance (SAD), and a 153-cm source-to-detector distance (SDD), which yields a magnification factor of 1.53. A technique of 120 kVp, 100 mA, 20 ms per exposure for a charge of 2 mAs per projection, was used. The imaging dose delivered ...
Welcome to the 27th European Congress of Radiology
... protection, as well as promoting best practice in keeping radiation doses as low as possible while maintaining image quality, will benefit patients by directly improving the quality and safety of imaging practice. For this reason, we recently published a paper entitled Renewal of radiological equipm ...
... protection, as well as promoting best practice in keeping radiation doses as low as possible while maintaining image quality, will benefit patients by directly improving the quality and safety of imaging practice. For this reason, we recently published a paper entitled Renewal of radiological equipm ...
Role of CTDI to estimate patient dose from a single slice to multi
... used for a different purpose. The most readily available are dose indices known as the Volume Computed Tomography Dose Index (CTDIvol) and dose length product (DLP) which are displayed on the CT scanner console. These values are obtained in the factory by scanning two acrylic cylinders (one with a 1 ...
... used for a different purpose. The most readily available are dose indices known as the Volume Computed Tomography Dose Index (CTDIvol) and dose length product (DLP) which are displayed on the CT scanner console. These values are obtained in the factory by scanning two acrylic cylinders (one with a 1 ...
Generalized DQE analysis of radiographic and dual‐energy imaging
... cone-beam computerized tomography 共CT兲.21 DE imaging offers a sensitive, specific, cost-effective, and seemingly underutilized modality for thoracic imaging. While not a new technique, DE imaging improves conspicuity and reduces anatomical noise by processing two images acquired at two beam energies ...
... cone-beam computerized tomography 共CT兲.21 DE imaging offers a sensitive, specific, cost-effective, and seemingly underutilized modality for thoracic imaging. While not a new technique, DE imaging improves conspicuity and reduces anatomical noise by processing two images acquired at two beam energies ...
Real-Time Imaging of Skeletal Muscle Velocity
... This study indicates that real-time PC MRI is a feasible means to acquire in vivo skeletal muscle tissue velocity data during joint motion. The direction of muscle tissue motion during elbow flexion and extension was consistent among all subjects. Muscle velocity data for these subjects demonstrate t ...
... This study indicates that real-time PC MRI is a feasible means to acquire in vivo skeletal muscle tissue velocity data during joint motion. The direction of muscle tissue motion during elbow flexion and extension was consistent among all subjects. Muscle velocity data for these subjects demonstrate t ...
Optimal Scanning Protocols for Dual
... treatment for PAD [4]. The main concern of stent implantation is the development of in-stent restenosis. Recent studies have shown a 30%–55% restenosis rate after the first year of stent implementation [5–7], indicating that a follow-up examination for the patency of implanted stents is important. A ...
... treatment for PAD [4]. The main concern of stent implantation is the development of in-stent restenosis. Recent studies have shown a 30%–55% restenosis rate after the first year of stent implementation [5–7], indicating that a follow-up examination for the patency of implanted stents is important. A ...
Award Winners
... Third-Generation Dual-Source CT: Advances and Advantages in Clinical Practice T.J. Vrtiska, MD, Rochester, MN; R. Vasconcelos, MD; J. Montoya; T.A. Macedo, MD; T.A. Foley, MD; E.E. Williamson, MD ...
... Third-Generation Dual-Source CT: Advances and Advantages in Clinical Practice T.J. Vrtiska, MD, Rochester, MN; R. Vasconcelos, MD; J. Montoya; T.A. Macedo, MD; T.A. Foley, MD; E.E. Williamson, MD ...
- Frank`s Hospital Workshop
... Excessive heat or small amounts of water may damage the scanner’s electrical components. Do not use in the presence of flammable anesthetics mixtures. Do not autoclave the imaging plates. Autoclaving will damage the imaging plate. If this happens, discard the imaging plate and replace it with a new ...
... Excessive heat or small amounts of water may damage the scanner’s electrical components. Do not use in the presence of flammable anesthetics mixtures. Do not autoclave the imaging plates. Autoclaving will damage the imaging plate. If this happens, discard the imaging plate and replace it with a new ...
Full Text - RSNA Publications Online
... The study was powered to show a difference in sensitivity of approximately 15% between contrast agents for the diagnosis of malignant lesions. By using the McNemar test of equality of paired proportions (nQuery, version 6.01; Statistical Solutions, Cork, Ireland), and assuming 25% discordant pairs, ...
... The study was powered to show a difference in sensitivity of approximately 15% between contrast agents for the diagnosis of malignant lesions. By using the McNemar test of equality of paired proportions (nQuery, version 6.01; Statistical Solutions, Cork, Ireland), and assuming 25% discordant pairs, ...
2003-Conventional and diffusion weighted MRI in methanol poisoning
... methanol analyzes, simple laboratory findings ...
... methanol analyzes, simple laboratory findings ...
III. Profile Details - QIBA Wiki
... X-ray CT uses ionizing radiation. Exposure to ionizing radiation increases known health risks to the subject. It is recognized that there are tradeoffs between radiation dose and image quality. As the radiation dose is reduced, image quality can be degraded. Because of these tradeoffs, the use of th ...
... X-ray CT uses ionizing radiation. Exposure to ionizing radiation increases known health risks to the subject. It is recognized that there are tradeoffs between radiation dose and image quality. As the radiation dose is reduced, image quality can be degraded. Because of these tradeoffs, the use of th ...
Accuracy of turbo spin-echo diffusion
... middle ear CS and currently non-echoplanar DWI has replaced the second look surgery for the follow-up evaluation of postoperative patients in many centers (11, 13, 15). Several different non-echoplanar based techniques have been developed by different vendors, including half-Fourier acquisition sing ...
... middle ear CS and currently non-echoplanar DWI has replaced the second look surgery for the follow-up evaluation of postoperative patients in many centers (11, 13, 15). Several different non-echoplanar based techniques have been developed by different vendors, including half-Fourier acquisition sing ...
Image Guided Radiation Therapy: A Refresher
... i reduction d i for f most RT treatments. … facilitate implementation of new RT techniques (eg, (eg liver and lung SBRT) and in selected sites reduce toxicity and improve local control. The whole chain of interventions in the RT process should be prospectively assessed. This is particularly importan ...
... i reduction d i for f most RT treatments. … facilitate implementation of new RT techniques (eg, (eg liver and lung SBRT) and in selected sites reduce toxicity and improve local control. The whole chain of interventions in the RT process should be prospectively assessed. This is particularly importan ...
W(h)ither human cardiac and body magnetic
... At ultrahigh fields the crux of the matter is that the wavelength becomes sufficiently short versus the size of the upper torso, abdomen and pelvis. As deep-lying organs surrounded by the lung, stomach, bowels and other inhomogeneous tissue structures within the comparatively large volume of the tho ...
... At ultrahigh fields the crux of the matter is that the wavelength becomes sufficiently short versus the size of the upper torso, abdomen and pelvis. As deep-lying organs surrounded by the lung, stomach, bowels and other inhomogeneous tissue structures within the comparatively large volume of the tho ...
A Method to Measure the Detective Quantum Efficiency of
... this is the Healing Arts Radiation Protection Act) mandate allowable patient exposures for standard examinations, we do not know whether we are getting the best possible images for these exposures. We believe the only way of ensuring optimal image quality and low patient exposures in medical radiogr ...
... this is the Healing Arts Radiation Protection Act) mandate allowable patient exposures for standard examinations, we do not know whether we are getting the best possible images for these exposures. We believe the only way of ensuring optimal image quality and low patient exposures in medical radiogr ...
ACR–SPR Practice Parameter for the Performance of Renal
... patients. Practice Parameters and Technical Standards are not inflexible rules or requirements of practice and are not intended, nor should they be used, to establish a legal standard of care 1. For these reasons and those set forth below, the American College of Radiol ogy and our collaborating med ...
... patients. Practice Parameters and Technical Standards are not inflexible rules or requirements of practice and are not intended, nor should they be used, to establish a legal standard of care 1. For these reasons and those set forth below, the American College of Radiol ogy and our collaborating med ...
- Wiley Online Library
... In the past, there have been several studies on artifact reduction in 3D images reconstructed from truncated data.(14-22) Most of the reported methods estimated the incomplete part without any prior information. As a result, the image artifacts are reduced outside the ROI to a certain degree, depend ...
... In the past, there have been several studies on artifact reduction in 3D images reconstructed from truncated data.(14-22) Most of the reported methods estimated the incomplete part without any prior information. As a result, the image artifacts are reduced outside the ROI to a certain degree, depend ...
2011 SCCT guidelines on radiation dose and dose
... imaging requirements, which should be tailored to provide only the information necessary for diagnosis. It is important to note that a tailored examination for noncoronary cardiovascular CT frequently does not meet the requirements for adequate evaluation of the coronary arteries. Despite lower radi ...
... imaging requirements, which should be tailored to provide only the information necessary for diagnosis. It is important to note that a tailored examination for noncoronary cardiovascular CT frequently does not meet the requirements for adequate evaluation of the coronary arteries. Despite lower radi ...
14 Contrast Media
... sensitivity to contrast media greater than that of xray computed tomography (CT). First-pass brain studies now also make possible the assessment of regional cerebral blood volume. New hardware developments, together with advances in contrast media design, continue to drive the expansion of contrast ...
... sensitivity to contrast media greater than that of xray computed tomography (CT). First-pass brain studies now also make possible the assessment of regional cerebral blood volume. New hardware developments, together with advances in contrast media design, continue to drive the expansion of contrast ...
differential diagnosis of corpus callosum lesions
... • Imaging: early stage periventricular white matter necrosis, subacute stage cyst formation and late stage parenchymal loss, ventricular enlargement, thinning of the CC due to degeneration of transcallosal fibers mostly in splenium and posterior body. ...
... • Imaging: early stage periventricular white matter necrosis, subacute stage cyst formation and late stage parenchymal loss, ventricular enlargement, thinning of the CC due to degeneration of transcallosal fibers mostly in splenium and posterior body. ...
Experimental measurement of x-ray scatter
... and scattered radiation still spoil the reconstructed image quality and make robust quantitative measurements difficult to achieve in practice. It has long been recognized that x-ray scatter poses a significant threat to CT scanning by further reducing soft tissue contrast (Tofts and Gore 1980). In ...
... and scattered radiation still spoil the reconstructed image quality and make robust quantitative measurements difficult to achieve in practice. It has long been recognized that x-ray scatter poses a significant threat to CT scanning by further reducing soft tissue contrast (Tofts and Gore 1980). In ...
Chapter 15 SPECIAL PROCEDURES AND TECHNIQUES IN
... A miniature linac mounted on a robotic arm not only offers a real potential for frameless radiosurgery and actual image guided dose delivery, with obvious benefits to the patient and staff, but also enables the use of stereotactic treatment techniques on organs other than the brain. In comparison wi ...
... A miniature linac mounted on a robotic arm not only offers a real potential for frameless radiosurgery and actual image guided dose delivery, with obvious benefits to the patient and staff, but also enables the use of stereotactic treatment techniques on organs other than the brain. In comparison wi ...
Positron emission tomography
Positron emission tomography (PET) is a nuclear medicine, functional imaging technique that produces a three-dimensional image of functional processes in the body. The system detects pairs of gamma rays emitted indirectly by a positron-emitting radionuclide (tracer), which is introduced into the body on a biologically active molecule. Three-dimensional images of tracer concentration within the body are then constructed by computer analysis. In modern PET-CT scanners, three dimensional imaging is often accomplished with the aid of a CT X-ray scan performed on the patient during the same session, in the same machine.If the biologically active molecule chosen for PET is fluorodeoxyglucose (FDG), an analogue of glucose, the concentrations of tracer imaged will indicate tissue metabolic activity as it corresponds to the regional glucose uptake. Use of this tracer to explore the possibility of cancer metastasis (i.e., spreading to other sites) is the most common type of PET scan in standard medical care (90% of current scans). However, on a minority basis, many other radioactive tracers are used in PET to image the tissue concentration of other types of molecules of interest. One of the disadvantages of PET scanners is their operating cost.