Isotropic diffusion weighting in radial fast spin
... averaged to yield a “trace” image with average diffusion weighting (2). Because the trace of the diffusion tensor is invariant to rotation, the intensity in the resulting trace image is invariant to tissue orientation (7). A number of schemes for imparting isotropic diffusion weighting in individual ...
... averaged to yield a “trace” image with average diffusion weighting (2). Because the trace of the diffusion tensor is invariant to rotation, the intensity in the resulting trace image is invariant to tissue orientation (7). A number of schemes for imparting isotropic diffusion weighting in individual ...
Technical aspects and utility of fMRI using BOLD and ASL
... ASL perfusion images (Detre and Alsop, 1999). Table 1 lists a side-by-side comparison between BOLD and ASL perfusion fMRI. Examples of functional activation data obtained using BOLD and ASL perfusion fMRI are shown in Fig. 2. In general, the application of ASL approaches in functional imaging has be ...
... ASL perfusion images (Detre and Alsop, 1999). Table 1 lists a side-by-side comparison between BOLD and ASL perfusion fMRI. Examples of functional activation data obtained using BOLD and ASL perfusion fMRI are shown in Fig. 2. In general, the application of ASL approaches in functional imaging has be ...
Cervical spine trauma radiographs: Swimmers and supine obliques
... analysis of the data and evaluation of any significant findings within, and in comparison with the results from 1999, is presented. In summary, six main points are detailed: 1. All x-ray departments surveyed use a minimum of three projections to demonstrate the cervical spine in alert adults with susp ...
... analysis of the data and evaluation of any significant findings within, and in comparison with the results from 1999, is presented. In summary, six main points are detailed: 1. All x-ray departments surveyed use a minimum of three projections to demonstrate the cervical spine in alert adults with susp ...
1452 K - Iranian Journal of Nuclear Medicine
... Manuscripts are considered with the understanding that they are submitted solely to the "Iran J Nucl Med" and have not been published elsewhere previously either in print or electronic format, and are not under consideration by another publication or electronic medium. Submission of an article for p ...
... Manuscripts are considered with the understanding that they are submitted solely to the "Iran J Nucl Med" and have not been published elsewhere previously either in print or electronic format, and are not under consideration by another publication or electronic medium. Submission of an article for p ...
Contrast enhanced and functional magnetic resonance imaging for
... Several other studies analyzed the relation between infarct enhancement and viability. In one study,5 a subendocardial signal increase was 100% predictive for wall motion improvement in the very short term (2 weeks). Transmural or nonhomogeneous infarct segments showed no improvement in wall motion. ...
... Several other studies analyzed the relation between infarct enhancement and viability. In one study,5 a subendocardial signal increase was 100% predictive for wall motion improvement in the very short term (2 weeks). Transmural or nonhomogeneous infarct segments showed no improvement in wall motion. ...
Clinical Use of Electronic Portal Imaging : Report of AAPM Radiation
... exposed under a metal plate, with no phosphor, has a quantum efficiency of ~1%. Figure 2 shows that the quantum efficiency increases as the thickness of the phosphor screen increases, because the incident x-ray quanta can also interact directly within the phosphor screen36. Therefore, somewhat fortu ...
... exposed under a metal plate, with no phosphor, has a quantum efficiency of ~1%. Figure 2 shows that the quantum efficiency increases as the thickness of the phosphor screen increases, because the incident x-ray quanta can also interact directly within the phosphor screen36. Therefore, somewhat fortu ...
II. Clinical Context and Claims - QIBA Wiki
... following treatment with an experimental drug therapy. Secondary objectives may include change in metabolic activity using PET/CT, and other yet-to-be defined image feature. Trials employing quantitative imaging may also be designed to assess safety and tolerability of an experimental drug xxx. In m ...
... following treatment with an experimental drug therapy. Secondary objectives may include change in metabolic activity using PET/CT, and other yet-to-be defined image feature. Trials employing quantitative imaging may also be designed to assess safety and tolerability of an experimental drug xxx. In m ...
RESEARCH ARTICLE New Directions in X
... that could be resolved with these instruments to around a micrometer, or slightly less. A huge amount of information was accumulated using these microscopes especially about biology and medicine. The microscopist is very often faced with the need to improve the resolution, to see more detail in the ...
... that could be resolved with these instruments to around a micrometer, or slightly less. A huge amount of information was accumulated using these microscopes especially about biology and medicine. The microscopist is very often faced with the need to improve the resolution, to see more detail in the ...
accepted manuscript
... High-resolution X-ray Computed Tomography (HRXCT) or micro-CT (µCT) is a frequently used non-destructive 3D imaging and analysis technique for the investigation of internal structures of a large variety of objects, including geomaterials. Although the possibilities of X-ray micro-CT are becoming bet ...
... High-resolution X-ray Computed Tomography (HRXCT) or micro-CT (µCT) is a frequently used non-destructive 3D imaging and analysis technique for the investigation of internal structures of a large variety of objects, including geomaterials. Although the possibilities of X-ray micro-CT are becoming bet ...
5/2/2011 The Use of In-room kV Imaging for IGRT Disclosure
... – 45 offset (Jaffray, Chawla et al. 1995) – 90o offset with CBCT capability (Jaffray et al. 1999). – Precursor to modern commercial systems ...
... – 45 offset (Jaffray, Chawla et al. 1995) – 90o offset with CBCT capability (Jaffray et al. 1999). – Precursor to modern commercial systems ...
The Evolution of Stereotactic Radiosurgery
... - source change & radiation safety concern • Cyberknife: - high accuracy (submillimeter) - SRS/SBRT - cone collimation (MLC under development) - long treatment time • Linac: - Deliver all types of radiation treatment - capable of conforming to all target shapes (cone & MLC) - less cost - accuracy at ...
... - source change & radiation safety concern • Cyberknife: - high accuracy (submillimeter) - SRS/SBRT - cone collimation (MLC under development) - long treatment time • Linac: - Deliver all types of radiation treatment - capable of conforming to all target shapes (cone & MLC) - less cost - accuracy at ...
Use of CBCT in the diagnosis of cervical spine spondylosis
... The fields-of-view (H x D) of the unit are 60 x 60 mm, 75 x 100 mm, 75 x145 mm and 130 x145 mm, and they are selectable according to the diagnostic task at hand. SCANORA 3D provides a seated patient platform and the region of interest can be freely located in the head and neck area thanks to motoriz ...
... The fields-of-view (H x D) of the unit are 60 x 60 mm, 75 x 100 mm, 75 x145 mm and 130 x145 mm, and they are selectable according to the diagnostic task at hand. SCANORA 3D provides a seated patient platform and the region of interest can be freely located in the head and neck area thanks to motoriz ...
Subtraction techniques enable single
... changes in acute and subacute PE [4]. Perfusion imaging has been shown to increase sensitivity for PE, in particular for small emboli at a subsegmental level or in more distal vessels and to improve prediction of prognosis and therapy monitoring [5,6]. As an alternative, similar iodine maps can be c ...
... changes in acute and subacute PE [4]. Perfusion imaging has been shown to increase sensitivity for PE, in particular for small emboli at a subsegmental level or in more distal vessels and to improve prediction of prognosis and therapy monitoring [5,6]. As an alternative, similar iodine maps can be c ...
Venous malformations
... -Following aspiration, doxycycline mixed with contrast were injected into the lymphatic malformation. ...
... -Following aspiration, doxycycline mixed with contrast were injected into the lymphatic malformation. ...
IMPLEMENTATION AND CHARACTERIZATION OF CONE-BEAM COMPUTED TOMOGRAPHY USING A COBALT-60
... Cobalt-60 (Co-60) radiation therapy is a simple and reliable method of treating cancer by irradiating treatment volumes within the patient with high energy gamma rays. Medical linear accelerators (linacs) began to replace Co-60 units during the 1960’s in more developed countries, but Co-60 has remai ...
... Cobalt-60 (Co-60) radiation therapy is a simple and reliable method of treating cancer by irradiating treatment volumes within the patient with high energy gamma rays. Medical linear accelerators (linacs) began to replace Co-60 units during the 1960’s in more developed countries, but Co-60 has remai ...
Application Training 2016
... to reduce potential treatment errors, rescans, and gain more system availability at the same time. You want to decrease overtime, efficiently onboard new staff, and retain your well-trained employees. ...
... to reduce potential treatment errors, rescans, and gain more system availability at the same time. You want to decrease overtime, efficiently onboard new staff, and retain your well-trained employees. ...
Methods for improving limited field-of
... CT systems use detectors around 20!20 cm2 , providing around 15 cm of image FOV at isocenter. Systems utilizing EPIDs and FPIs around 40!40 cm2 provide FOVs of approximately 30 cm at isocenter. Use of a wider detector can improve the FOV, as can use of a laterally offset detector with overscanning o ...
... CT systems use detectors around 20!20 cm2 , providing around 15 cm of image FOV at isocenter. Systems utilizing EPIDs and FPIs around 40!40 cm2 provide FOVs of approximately 30 cm at isocenter. Use of a wider detector can improve the FOV, as can use of a laterally offset detector with overscanning o ...
A New Approach for the Enhancement of Dual
... 2.2 The limitation of Conventional CT imaging...................................................................... 8 2.3 Dual-Energy CT .................................................................................................................... 11 3. Dual-Energy CT Image Enhancement ..... ...
... 2.2 The limitation of Conventional CT imaging...................................................................... 8 2.3 Dual-Energy CT .................................................................................................................... 11 3. Dual-Energy CT Image Enhancement ..... ...
Kidneys and Adrenal Glands
... of both kidneys and is generally the coronal plane. The coronal plane is often advantageous for imaging of renal neoplasms, because it allows evaluation of both kidneys, the renal vessels, the inferior vena cava, and the spine in a small number of slices. The imaging FOV generally varies between 30 ...
... of both kidneys and is generally the coronal plane. The coronal plane is often advantageous for imaging of renal neoplasms, because it allows evaluation of both kidneys, the renal vessels, the inferior vena cava, and the spine in a small number of slices. The imaging FOV generally varies between 30 ...
Stimulated Echo Diffusion Weighted Imaging of the Liver at 3 Tesla
... to microscopic motion, which is due to Brownian motion of water molecules and blood microcirculation in biological tissue (1). The DW signal depends not only on bvalues but also the diffusion time (D) (2). This is because water molecule diffusion is hindered or restricted by cellular microstructures ...
... to microscopic motion, which is due to Brownian motion of water molecules and blood microcirculation in biological tissue (1). The DW signal depends not only on bvalues but also the diffusion time (D) (2). This is because water molecule diffusion is hindered or restricted by cellular microstructures ...
The American College of Radiology, with more than 30,000
... Follow-up of tumor response to therapy B. Pediatric Indications At the time of this practice parameter revision, there are no is little data to support a supporting the role of CT brain perfusion imaging in pediatric stroke [51,52]. It may be reasonable to use CT brain perfusion imaging in individua ...
... Follow-up of tumor response to therapy B. Pediatric Indications At the time of this practice parameter revision, there are no is little data to support a supporting the role of CT brain perfusion imaging in pediatric stroke [51,52]. It may be reasonable to use CT brain perfusion imaging in individua ...
SNM Practice Guideline for Hepatobiliary Scintigraphy
... The administered activity for infants and children is 1.8 MBq/kg (0.05 mCi/kg), with a minimum administered activity of 18.5 MBq (0.5 mCi) (79). Mebrofenin is always preferred in neonates with hyperbilirubinemia, with a minimum administered activity of 37 MBq (1.0 mCi), as up to 24-h delayed images ...
... The administered activity for infants and children is 1.8 MBq/kg (0.05 mCi/kg), with a minimum administered activity of 18.5 MBq (0.5 mCi) (79). Mebrofenin is always preferred in neonates with hyperbilirubinemia, with a minimum administered activity of 37 MBq (1.0 mCi), as up to 24-h delayed images ...
Quality control methods for magnetic resonance imaging in
... One definition of quality assurance (QA) is: “a program for the systematic monitoring and evaluation of the various aspects of a project, service, or facility to ensure that standards of quality are being met” (Merriam-Webster 2015). A definition of quality control (QC) is “an aggregate of activitie ...
... One definition of quality assurance (QA) is: “a program for the systematic monitoring and evaluation of the various aspects of a project, service, or facility to ensure that standards of quality are being met” (Merriam-Webster 2015). A definition of quality control (QC) is “an aggregate of activitie ...
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.