Estimativa de dose nos pulmões para procedimentos
... Figure 4 – (a). Siemens’s Straton X-ray tube and (b). Its schematics, showing the anode directly attached to the tube envelope (source: Siemens Healthcare GmbH, 2015, adapted). ........................ 29 Figure 5 – Detector arrays in modern computed tomography, in a perspective and side view. The s ...
... Figure 4 – (a). Siemens’s Straton X-ray tube and (b). Its schematics, showing the anode directly attached to the tube envelope (source: Siemens Healthcare GmbH, 2015, adapted). ........................ 29 Figure 5 – Detector arrays in modern computed tomography, in a perspective and side view. The s ...
Methods of Studying The Nervous System
... of the waves emitted by hydrogen atoms when they are placed in a magnetic field • Its clarity stems from the fact that neural structures differ considerably in their density of hydrogen atoms Pinel's Biopsychology, 5th Ed. ...
... of the waves emitted by hydrogen atoms when they are placed in a magnetic field • Its clarity stems from the fact that neural structures differ considerably in their density of hydrogen atoms Pinel's Biopsychology, 5th Ed. ...
Computed Tomography Practice Standards 2013
... 1. Performs various power-up techniques per manufacturers specifications. 2. Evaluates lab values prior to administering contrast media, beginning interventional procedures or fusion imaging. 3. Determines patient compliance with pre-examination preparation instructions. 4. Reviews the patient’s med ...
... 1. Performs various power-up techniques per manufacturers specifications. 2. Evaluates lab values prior to administering contrast media, beginning interventional procedures or fusion imaging. 3. Determines patient compliance with pre-examination preparation instructions. 4. Reviews the patient’s med ...
Honored Lecture 2012 du RSNA congrès
... at the University of Texas MD Anderson Cancer Center in Houston, was awarded the 2012 Howard M. Pollack Medal. Dr. Sandler has served as a manuscript reviewer for RadioGraphics and on RSNA’s Scientific Program Committee’s Genitourinary and Breast Imaging Subcommittees. Joel E. Lichtenstein, M.D., ...
... at the University of Texas MD Anderson Cancer Center in Houston, was awarded the 2012 Howard M. Pollack Medal. Dr. Sandler has served as a manuscript reviewer for RadioGraphics and on RSNA’s Scientific Program Committee’s Genitourinary and Breast Imaging Subcommittees. Joel E. Lichtenstein, M.D., ...
X-Ray Imaging and Computed Tomography
... Planar X-ray radiography of overlapping layers of soft tissue or complex bone structures can often be difficult to interpret, even for a skilled radiologist. In these cases, X-ray computed tomography (CT) is used. The basic principles of CT are shown in Figure 1.2. The X-ray source is tightly collim ...
... Planar X-ray radiography of overlapping layers of soft tissue or complex bone structures can often be difficult to interpret, even for a skilled radiologist. In these cases, X-ray computed tomography (CT) is used. The basic principles of CT are shown in Figure 1.2. The X-ray source is tightly collim ...
Chapter 11: Computed Tomography - Human Health Campus
... It developed into a versatile 3D whole body imaging modality for a wide range of applications in for example • oncology, vascular radiology, cardiology, traumatology and interventional radiology. ...
... It developed into a versatile 3D whole body imaging modality for a wide range of applications in for example • oncology, vascular radiology, cardiology, traumatology and interventional radiology. ...
Breast MRI Accreditation Program Requirements
... that never submit a unit for accreditation testing are subject to revocation of their accreditation. Such revocation could adversely affect reimbursement. Although facilities applying for accreditation are not required to submit phantom images for accreditation review at this time, the ACR may requi ...
... that never submit a unit for accreditation testing are subject to revocation of their accreditation. Such revocation could adversely affect reimbursement. Although facilities applying for accreditation are not required to submit phantom images for accreditation review at this time, the ACR may requi ...
Design and Preliminary Accuracy Studies of an MRI
... manipulator axis to be translated forward and backward via a two stage cumulative screw mechanism. The push rod is connected to the steerable needle channel, thus rotating the needle channel about the hinge axis and controlling the needle angle. A narrow slot on the bottom of the endorectal sheath a ...
... manipulator axis to be translated forward and backward via a two stage cumulative screw mechanism. The push rod is connected to the steerable needle channel, thus rotating the needle channel about the hinge axis and controlling the needle angle. A narrow slot on the bottom of the endorectal sheath a ...
SCCT Guidelines for the Interpretation and Reporting of Coronary
... of the study as well as simulate or obscure coronary stenoses.50–52 This is sufficiently common to require identification of artifacts prior to definitive image interpretation. Reconstruction artifacts ‘‘Stairstep artifacts’’ are due to motion occurring between reconstruction of sequential heartbeat ...
... of the study as well as simulate or obscure coronary stenoses.50–52 This is sufficiently common to require identification of artifacts prior to definitive image interpretation. Reconstruction artifacts ‘‘Stairstep artifacts’’ are due to motion occurring between reconstruction of sequential heartbeat ...
Imaging of intracranial haemorrhage
... Washington Hospital Center, Washington DC, USA (C S Kidwell MD); and Department of Radiology, University of California San ...
... Washington Hospital Center, Washington DC, USA (C S Kidwell MD); and Department of Radiology, University of California San ...
Approach to Solid Liver Masses in the Cirrhotic Patient
... wash-out. The diagnostic accuracy of MRI and computed tomography (CT), sensitivity, and specificity in the diagnosis of liver mass is shown in Table 3 [19]. Fine needle aspiration and core biopsy Fine needle aspiration and core biopsy (FNAB) is safe, accurate and cost effective. Its specificity appr ...
... wash-out. The diagnostic accuracy of MRI and computed tomography (CT), sensitivity, and specificity in the diagnosis of liver mass is shown in Table 3 [19]. Fine needle aspiration and core biopsy Fine needle aspiration and core biopsy (FNAB) is safe, accurate and cost effective. Its specificity appr ...
Prospective motion correction in brain imaging: A review
... MRI (fMRI), motion correlated to the stimulus can produce false activations (5); this is particularly problematic when motion is part of the study, such as movement tasks in fMRI. In spectroscopy, the effects of motion are particularly insidious, as motion reduces spectral quality and diagnostic val ...
... MRI (fMRI), motion correlated to the stimulus can produce false activations (5); this is particularly problematic when motion is part of the study, such as movement tasks in fMRI. In spectroscopy, the effects of motion are particularly insidious, as motion reduces spectral quality and diagnostic val ...
Introduction: We hypothesize that high resolution MRI of ex
... Introduction: We hypothesize that high resolution MRI of ex vivo prostate specimen can improve identification of cancer. We report preliminary results in correlating ex vivo MRI of prostate specimen with whole-mount histology and in vivo MRI. Eight excised prostate specimens were imaged immediately ...
... Introduction: We hypothesize that high resolution MRI of ex vivo prostate specimen can improve identification of cancer. We report preliminary results in correlating ex vivo MRI of prostate specimen with whole-mount histology and in vivo MRI. Eight excised prostate specimens were imaged immediately ...
Technical advancements and protocol optimization of diffusion
... In EPI sequence, the chemical shift of fat resonance causes a large displacement of fat signal along the phase encoding direction. If the fat signal is not completely suppressed, it may super impose on the region of interest. Therefore, for DW-EPI in abdomen where fatty tissue is extensively present ...
... In EPI sequence, the chemical shift of fat resonance causes a large displacement of fat signal along the phase encoding direction. If the fat signal is not completely suppressed, it may super impose on the region of interest. Therefore, for DW-EPI in abdomen where fatty tissue is extensively present ...
Vessel Imaging by Interferometric Phase-Contrast X
... CT images, whereas the absorption-contrast x-ray image could not depict the vessel structure at all. Although the vessel 0.05 mm in diameter was depicted by the blood itself,13 the vessel 0.03 mm in diameter was revealed clearly by physiological saline. This significant image contrast produced by ph ...
... CT images, whereas the absorption-contrast x-ray image could not depict the vessel structure at all. Although the vessel 0.05 mm in diameter was depicted by the blood itself,13 the vessel 0.03 mm in diameter was revealed clearly by physiological saline. This significant image contrast produced by ph ...
mari partanen application of diffusion
... Magnetic resonance imaging (MRI) is one of the most important imaging modalities in today’s modern world. It has high contrast sensitivity to soft tissue differences and the use of nonionizing radiation makes it safe to use. MRI is based on nuclear magnetic moment of the hydrogen nuclei (protons). [ ...
... Magnetic resonance imaging (MRI) is one of the most important imaging modalities in today’s modern world. It has high contrast sensitivity to soft tissue differences and the use of nonionizing radiation makes it safe to use. MRI is based on nuclear magnetic moment of the hydrogen nuclei (protons). [ ...
Radiation Dose and Image Quality in Computed
... patients undergoing computed tomography (CT) examinations and image quality with the use of automatic exposure control (AEC) and fixed tube current (FTC) techniques using a head and body phantom in a Siemens emotion 16-slice multidetector computed tomography (MDCT) scanner. The head and body phantom ...
... patients undergoing computed tomography (CT) examinations and image quality with the use of automatic exposure control (AEC) and fixed tube current (FTC) techniques using a head and body phantom in a Siemens emotion 16-slice multidetector computed tomography (MDCT) scanner. The head and body phantom ...
Application of Intelligent Computational Models on Computed
... There are recent reviews had been done on the development of CAD for the analysis of lung medical images [3, 12-14]. Lee et al.[13] reviewed the recent existing methods on automated lung nodule detection, and compare the performance on each method. Based on their survey, the authors had introduced a ...
... There are recent reviews had been done on the development of CAD for the analysis of lung medical images [3, 12-14]. Lee et al.[13] reviewed the recent existing methods on automated lung nodule detection, and compare the performance on each method. Based on their survey, the authors had introduced a ...
Managing Patient Dose in Multi-Detector Computed Tomography
... There is lack of consensus on how image quality is to be specified; with the result that there are significant differences in the ways different companies achieve exposure control. It is important that users are aware of the behaviour of their system. “One-size-fits-all” type protocols must not be u ...
... There is lack of consensus on how image quality is to be specified; with the result that there are significant differences in the ways different companies achieve exposure control. It is important that users are aware of the behaviour of their system. “One-size-fits-all” type protocols must not be u ...
Variation of image counts with patient anatomy and development of... simulation system for whole-body bone scans.
... Figure 7. The Zubal phantom. (Left) Sagittal slice through the torso of the phantom. (Middle and Right) Transverse slices of the torso and head respectively. Voxel based phantoms display a greater level of detail but at the expense of flexibility [78]............ 34 Figure 8. The NCAT male torso pha ...
... Figure 7. The Zubal phantom. (Left) Sagittal slice through the torso of the phantom. (Middle and Right) Transverse slices of the torso and head respectively. Voxel based phantoms display a greater level of detail but at the expense of flexibility [78]............ 34 Figure 8. The NCAT male torso pha ...
Quantitative Imaging With a Pinhole Cardiac SPECT CZT Camera
... Dual Energy Window (DEW) scatter correction (SC) method was developed that compensates for the presence of unscattered photons in the lower-energy window used to measure scatter. The DEW-SC method was validated using phantom experiments. The mean error in absolute activity measurement was 5 ± 4 % wh ...
... Dual Energy Window (DEW) scatter correction (SC) method was developed that compensates for the presence of unscattered photons in the lower-energy window used to measure scatter. The DEW-SC method was validated using phantom experiments. The mean error in absolute activity measurement was 5 ± 4 % wh ...
Transmission and emission x-ray microscopy: operation modes
... limitations on the specimen thickness (<100 nm) and state (dry or frozen hydrated specimen slices). In comparison, x-ray microscopes can image not only thicker specimens in their natural environment (e.g. whole cells) but the unique interactions of x-rays with matter allow control of the specimen ch ...
... limitations on the specimen thickness (<100 nm) and state (dry or frozen hydrated specimen slices). In comparison, x-ray microscopes can image not only thicker specimens in their natural environment (e.g. whole cells) but the unique interactions of x-rays with matter allow control of the specimen ch ...
Focal Orbital Amyloidosis Presenting as Rectus Muscle
... and showed characteristic green birefringence when viewed under polarized light (Fig 1G). The specimen was decolorized after treatment with potassium permanganate. The diagnosis of amyloidosis (AA form) was made histopathologically. Rectal biopsy performed after surgery was negative for amyloid. No ...
... and showed characteristic green birefringence when viewed under polarized light (Fig 1G). The specimen was decolorized after treatment with potassium permanganate. The diagnosis of amyloidosis (AA form) was made histopathologically. Rectal biopsy performed after surgery was negative for amyloid. No ...
Coronary Computed Tomography Angiography
... characteristics. Calculation of computational fluid dynamics by cardiac CT allows the noninvasive estimation of fractional flow reserve, which increases the diagnostic accuracy for detection of hemodynamically significant coronary artery disease. In addition, a combination of myocardial CT perfusion ...
... characteristics. Calculation of computational fluid dynamics by cardiac CT allows the noninvasive estimation of fractional flow reserve, which increases the diagnostic accuracy for detection of hemodynamically significant coronary artery disease. In addition, a combination of myocardial CT perfusion ...
Computed Tomography Radiation Safety Issues in Ontario
... The use of CT for medical diagnosis has substantially increased over the past decade, resulting in increasing patient radiation dose from this imaging modality.(2, 4, 14, 19) The introduction of 64-slice CT scanners has further increased the patient throughput and the indications for CT. There is a ...
... The use of CT for medical diagnosis has substantially increased over the past decade, resulting in increasing patient radiation dose from this imaging modality.(2, 4, 14, 19) The introduction of 64-slice CT scanners has further increased the patient throughput and the indications for CT. There is a ...
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.