Nuclear Magnetic Resonance Imaging*
... flow rates in NMR images, an application of potential significance in the study and treatment of heart disease, circulatory· disorders such as atherosclerosis, and stroke. Thus, although the resolution of NMR images at present is inferior to that of X-ray CT, its improved contrast often results in i ...
... flow rates in NMR images, an application of potential significance in the study and treatment of heart disease, circulatory· disorders such as atherosclerosis, and stroke. Thus, although the resolution of NMR images at present is inferior to that of X-ray CT, its improved contrast often results in i ...
Magnetic resonance imaging—the Aberdeen perspective on
... (Damadian 1971), not unlike our own early tissue sample work. For this proton NMR, the lower electromagnetic frequency necessary has much less absorption and scatter, which, together with much lower magnetic fields and the much higher concentration of water protons, made it a much more practicable p ...
... (Damadian 1971), not unlike our own early tissue sample work. For this proton NMR, the lower electromagnetic frequency necessary has much less absorption and scatter, which, together with much lower magnetic fields and the much higher concentration of water protons, made it a much more practicable p ...
Standardized medical terminology for cardiac computed tomography
... Cardiac computed tomography: This term refers to the use of any form of computed tomographic imaging of the heart that uses the ECG signal for data acquisition or image reconstruction. It may be specified as noncontrast cardiac CT, such as a coronary calcium scan, or contrast-enhanced cardiac CT, su ...
... Cardiac computed tomography: This term refers to the use of any form of computed tomographic imaging of the heart that uses the ECG signal for data acquisition or image reconstruction. It may be specified as noncontrast cardiac CT, such as a coronary calcium scan, or contrast-enhanced cardiac CT, su ...
Rheumatoid Arthritis: MRI as an Efficacy Endpoint in
... Since its advent, magnetic resonance imaging (MRI) has been used increasingly in the clinical assessment of rheumatoid arthritis (RA). The ability of MRI to detect soft tissue findings such as synovial and bone marrow changes in RA in multiple imaging planes has proved to be more effective than radi ...
... Since its advent, magnetic resonance imaging (MRI) has been used increasingly in the clinical assessment of rheumatoid arthritis (RA). The ability of MRI to detect soft tissue findings such as synovial and bone marrow changes in RA in multiple imaging planes has proved to be more effective than radi ...
A robust method, based on a novel source, for performance and
... ositron emission tomography (PET) is a powerful molecular imaging modality enabling measurements of radiotracers distributions in vivo. Spatial resolution is the ability of the system to image an object without blurring and so, it is a measure of how close two adjacent objects can be distinguished. ...
... ositron emission tomography (PET) is a powerful molecular imaging modality enabling measurements of radiotracers distributions in vivo. Spatial resolution is the ability of the system to image an object without blurring and so, it is a measure of how close two adjacent objects can be distinguished. ...
Daniel B. Kopans, MD, FACR - Society of Breast Imaging
... research projects and is the author of over 250 peer reviewed publications. His textbook on Breast Imaging is one of the leading references in the field. Dr. Kopans developed the springhook wire localization system and the methods for positioning it that permitted radiologists to aggressively, but s ...
... research projects and is the author of over 250 peer reviewed publications. His textbook on Breast Imaging is one of the leading references in the field. Dr. Kopans developed the springhook wire localization system and the methods for positioning it that permitted radiologists to aggressively, but s ...
What is Radiology and Radiologic Technology?
... factors. The result must be high-quality images or effective radiation treatments based on a proper assessment of the patient’s age, body type, physical condition, and suspected pathology. Assist the radiologist during procedures by changing films, positioning patients, and preparing contrast media ...
... factors. The result must be high-quality images or effective radiation treatments based on a proper assessment of the patient’s age, body type, physical condition, and suspected pathology. Assist the radiologist during procedures by changing films, positioning patients, and preparing contrast media ...
Document
... Noise in CT is usually defined as the standard deviation () of the CT numbers calculated from pixel values in a predefined region-of-interest (ROI) using an image of a uniform material (usually water). The selected ROI region should be void of objects and cover a sufficiently large image area (circ ...
... Noise in CT is usually defined as the standard deviation () of the CT numbers calculated from pixel values in a predefined region-of-interest (ROI) using an image of a uniform material (usually water). The selected ROI region should be void of objects and cover a sufficiently large image area (circ ...
Positron Emission Tomography in the Routine Management of
... tomography (PET) have made dramatic advances over the past three years, particularly in myocardial perfusion imaging. These advances include cardiac-specific PET technology, specialized software, and profound biological insights into myocardial perfusion far beyond the traditional binary interpretat ...
... tomography (PET) have made dramatic advances over the past three years, particularly in myocardial perfusion imaging. These advances include cardiac-specific PET technology, specialized software, and profound biological insights into myocardial perfusion far beyond the traditional binary interpretat ...
Radiation and You - What is the risk?
... Computed Tomography (CT) uses more radiation than a plain x-ray because it produces a more detailed image. Many of the recent news items have concerned CT, due to its growing use in diagnosing many disease processes. This diagnostic benefit may outweigh the radiation risk, so patients and their refe ...
... Computed Tomography (CT) uses more radiation than a plain x-ray because it produces a more detailed image. Many of the recent news items have concerned CT, due to its growing use in diagnosing many disease processes. This diagnostic benefit may outweigh the radiation risk, so patients and their refe ...
IX. H. Quality Control Monitors and Imaging Formatter
... specific requirements of each type of study. Whole-body scans require large matrices. When large matrices are used for smaller areas, higher resolution images can be obtained, but they have more statistical fluctuation (noise). Statistical fluctuation in large matrix sizes can be reduced by smoothin ...
... specific requirements of each type of study. Whole-body scans require large matrices. When large matrices are used for smaller areas, higher resolution images can be obtained, but they have more statistical fluctuation (noise). Statistical fluctuation in large matrix sizes can be reduced by smoothin ...
Introduction to Radiology - UNC School of Medicine
... How will this study impact your clinical decision making? If it won’t, perhaps its useful to rethink the need for the study. Become adept at how to read basic studies (chest and abdominal films for line and tube placement in particular) ...
... How will this study impact your clinical decision making? If it won’t, perhaps its useful to rethink the need for the study. Become adept at how to read basic studies (chest and abdominal films for line and tube placement in particular) ...
Recent Advances in Pulmonary Imaging
... identified prospectively by MRA. Of the six clots that were missed by MRA, four were subsegmental. Clearly MRA has a high sensitivity and specificity for central, lobar, and segmental vessels but has limitations, which are similar to CT, in its ability to detect subsegmental clots. MRA has the addit ...
... identified prospectively by MRA. Of the six clots that were missed by MRA, four were subsegmental. Clearly MRA has a high sensitivity and specificity for central, lobar, and segmental vessels but has limitations, which are similar to CT, in its ability to detect subsegmental clots. MRA has the addit ...
EdwardRandersonMSSRPPoster_final ps
... Zone (IZ) bands are visible on Optical Coherence Tomography (OCT) images. As these bands originate from the rod and cone photoreceptors, their disruption has been correlated with severe defects in visual acuity.2,3 In this study we sought to use AO imaging in combination with standard clinical imagi ...
... Zone (IZ) bands are visible on Optical Coherence Tomography (OCT) images. As these bands originate from the rod and cone photoreceptors, their disruption has been correlated with severe defects in visual acuity.2,3 In this study we sought to use AO imaging in combination with standard clinical imagi ...
CT Simulator QA
... 3D IGRT Image Quality Tests: Similar to diagnostic CT high contrast resolution: diagnostic CT ...
... 3D IGRT Image Quality Tests: Similar to diagnostic CT high contrast resolution: diagnostic CT ...
Total Body/Total Skin Irradiation
... By far the largest contribution to the radiation exposure, but may be overtaken due to increased CBCT applications A variety of scan protocols have been proposed to reduce the CT doses to the patients while maintaining clinically acceptable image quality ...
... By far the largest contribution to the radiation exposure, but may be overtaken due to increased CBCT applications A variety of scan protocols have been proposed to reduce the CT doses to the patients while maintaining clinically acceptable image quality ...
Setting the 3T benchmark
... MultiTransmit enables consistent uniform image quality to assist with a confident diagnosis, patient after patient. Shown here: High resolution 2D T1-weighted gradient echo sequences. Left: Conventional 3T. Right: MultiTransmit. ...
... MultiTransmit enables consistent uniform image quality to assist with a confident diagnosis, patient after patient. Shown here: High resolution 2D T1-weighted gradient echo sequences. Left: Conventional 3T. Right: MultiTransmit. ...
Nuclear medicine in psychiatry
... no post-traumatic disorder, whereas 95% with rCBF changes do. RCBF SPECT scanning is particularly useful in imaging blood ...
... no post-traumatic disorder, whereas 95% with rCBF changes do. RCBF SPECT scanning is particularly useful in imaging blood ...
Cardiac Imaging Memo from the COO Center receives Scanner Transplant
... and Siemens Biograph 40 PET/CT. Each scanner offers a new set of advantages for Cardiac Imaging. The installation of the Avanto Scanner at the Emory Clinic will improve our ability to perform state-of-the-art cardiac MRI. This advancement allows the radiologists to create moving images of the heart ...
... and Siemens Biograph 40 PET/CT. Each scanner offers a new set of advantages for Cardiac Imaging. The installation of the Avanto Scanner at the Emory Clinic will improve our ability to perform state-of-the-art cardiac MRI. This advancement allows the radiologists to create moving images of the heart ...
Consent Form for Contrast-Enhanced Magnetic Resonance Imaging
... Resonance Imaging (MRI) Scan If you agree to have a contrast-enhanced MRI scan, please sign below. I have received a thorough explanation about contrast-enhanced MRI scans and their risks by reading “Information about Magnetic Resonance Imaging (MRI) Scan with Contrast Medium”, and I understand the ...
... Resonance Imaging (MRI) Scan If you agree to have a contrast-enhanced MRI scan, please sign below. I have received a thorough explanation about contrast-enhanced MRI scans and their risks by reading “Information about Magnetic Resonance Imaging (MRI) Scan with Contrast Medium”, and I understand the ...
Tomographic Image Reconstruction 1 Introduction
... object without the superposition of over- and under-lying structures that usually plagues conventional projection images. For example, in a conventional chest radiograph, the heart, lungs, and ribs are all superimposed on the same film, whereas a computed tomography (CT) slice captures each organ in ...
... object without the superposition of over- and under-lying structures that usually plagues conventional projection images. For example, in a conventional chest radiograph, the heart, lungs, and ribs are all superimposed on the same film, whereas a computed tomography (CT) slice captures each organ in ...
13 Definition of Target Volume and Organs at Risk. Biological Target
... radiation treatment. But also the technique used for irradiation, including the patient’s positioning and fixation, are of major importance. As a consequence, the complexity of the process when defining the target volume requires sound clinical judgement and knowledge from the radiation oncologist. Th ...
... radiation treatment. But also the technique used for irradiation, including the patient’s positioning and fixation, are of major importance. As a consequence, the complexity of the process when defining the target volume requires sound clinical judgement and knowledge from the radiation oncologist. Th ...
CHARACTERIZATION OF A GAS-PURGE METHOD TO ACCESS 11
... Simple carboxylic acids radiolabeled with carbon-11 (t1/2: 20.4 min), especially [11C]-acetate and [11C]-palmitate, have been used widely as tools for imaging with positron emission tomography (PET) to evaluate the rate at which their endogenous counterparts are being oxidatively metabolized by myoc ...
... Simple carboxylic acids radiolabeled with carbon-11 (t1/2: 20.4 min), especially [11C]-acetate and [11C]-palmitate, have been used widely as tools for imaging with positron emission tomography (PET) to evaluate the rate at which their endogenous counterparts are being oxidatively metabolized by myoc ...
Maximizing dose reductions with cardiac CT | SpringerLink
... which will both minimize radiation and afford better image quality, is to restrict the xy field of view. A smaller xy field of view will improve image quality, as the FOV divided by 512 is the resolution in the X–Y axis (to an optimal resolution of about 0.3–0.35 mm for current scanners). The bowtie ...
... which will both minimize radiation and afford better image quality, is to restrict the xy field of view. A smaller xy field of view will improve image quality, as the FOV divided by 512 is the resolution in the X–Y axis (to an optimal resolution of about 0.3–0.35 mm for current scanners). The bowtie ...
AliMohamedAhmedMFKE2012CHAP1
... The use of process tomography is not limited to only obtaining crosssectional image of processes. It can also be used to obtain mass-flows rate or volume flow rates and velocity profiles. Depending on the mechanism of the process tomography sensor can be used in processes involving solids, liquids, ...
... The use of process tomography is not limited to only obtaining crosssectional image of processes. It can also be used to obtain mass-flows rate or volume flow rates and velocity profiles. Depending on the mechanism of the process tomography sensor can be used in processes involving solids, liquids, ...
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.