Basics of Magnetic Resonance Imaging
... imaged tissue will therefore demonstrate an intraluminal void of signal, termed a flow void. It is also possible to use flow to generate signal enhancement. To accomplish this, the slice of tissue to be imaged can be saturated— depleted of its longitudinal magnetization by repeated RF pulsing—thereb ...
... imaged tissue will therefore demonstrate an intraluminal void of signal, termed a flow void. It is also possible to use flow to generate signal enhancement. To accomplish this, the slice of tissue to be imaged can be saturated— depleted of its longitudinal magnetization by repeated RF pulsing—thereb ...
Magnetic resonance imaging- based radiation therapy
... Average local difference in Hounsfield units (HU) between pseudo-CT and actual CT images for soft- and bony tissues were -1±13 HU and -10±139 HU, respectively. Measurement points in soft tissue had coverage of 89 % with smaller absolute error than 20 HUs. In bony tissue average of 88 % of the measur ...
... Average local difference in Hounsfield units (HU) between pseudo-CT and actual CT images for soft- and bony tissues were -1±13 HU and -10±139 HU, respectively. Measurement points in soft tissue had coverage of 89 % with smaller absolute error than 20 HUs. In bony tissue average of 88 % of the measur ...
Title: Multimodal TOF PET and/or SPECT probe operating in low
... standard PET. One or more panel detectors can be added for high efficiency in detecting linphonodes. Another significant reason is that use of the conventional scanner allows acquisition of complete tomographic data rather than limited-angle tomographic information. The limited angle tomographic pro ...
... standard PET. One or more panel detectors can be added for high efficiency in detecting linphonodes. Another significant reason is that use of the conventional scanner allows acquisition of complete tomographic data rather than limited-angle tomographic information. The limited angle tomographic pro ...
Policies Standards And Guidelines For Radiologic Technology
... of x-rays have been overwhelming with an impressive array of diagnostic and therapeutic equipment presently available. Aside from routine diagnostic radiography, many specialties have emerged such as Nuclear Medicine, Radiation ...
... of x-rays have been overwhelming with an impressive array of diagnostic and therapeutic equipment presently available. Aside from routine diagnostic radiography, many specialties have emerged such as Nuclear Medicine, Radiation ...
CT imaging in small animals
... Image orientation and positioning nomenclature in CT also differ from human medicine. The majority of veterinary CT scans are performed with the patient prone rather than supine, and head first or feet first varies with the type of examination. ...
... Image orientation and positioning nomenclature in CT also differ from human medicine. The majority of veterinary CT scans are performed with the patient prone rather than supine, and head first or feet first varies with the type of examination. ...
Functional imaging in liver tumours Maxime Ronot 1,2,3, Ashley
... lesions are challenging because not all of them correspond to HCC at the time of imaging, and around one third may eventually progress to hypervascular HCC over a period of 12-18 months 27–29. In this setting, ancillary findings such as hyperintensity on DW- or on T2-weighted MR sequences have been ...
... lesions are challenging because not all of them correspond to HCC at the time of imaging, and around one third may eventually progress to hypervascular HCC over a period of 12-18 months 27–29. In this setting, ancillary findings such as hyperintensity on DW- or on T2-weighted MR sequences have been ...
MAGNETIC RESONANCE IMAGING OF PAROTID
... Nakashima T, Oda Y, Honda H. Parotid gland tumors: can addition of diffusion-weighted MR imaging to dynamic contrast-enhanced MR imaging improve diagnostic accuracy in ...
... Nakashima T, Oda Y, Honda H. Parotid gland tumors: can addition of diffusion-weighted MR imaging to dynamic contrast-enhanced MR imaging improve diagnostic accuracy in ...
The possibilities of reducing radiation dose and improve image
... Radiation effects are divided into two groups; stochastic effects and deterministic effects. Stochastic effect in radiation is increased probability of cancer induction. Deterministic effects are in example cataract, hair loss and erythema. The International Committee on Radiation Protection (ICRP) ...
... Radiation effects are divided into two groups; stochastic effects and deterministic effects. Stochastic effect in radiation is increased probability of cancer induction. Deterministic effects are in example cataract, hair loss and erythema. The International Committee on Radiation Protection (ICRP) ...
Multislice HELICAL CT SCANNER
... clinicians to accurately diagnose disease at an early stage. With the corresponding increase in the number of CT scans, minimizing the dose in every examination becomes an even greater concern. The design choices made in Aquilion maximize dose efficiency, with tubes that reduce off-focal X-rays and ...
... clinicians to accurately diagnose disease at an early stage. With the corresponding increase in the number of CT scans, minimizing the dose in every examination becomes an even greater concern. The design choices made in Aquilion maximize dose efficiency, with tubes that reduce off-focal X-rays and ...
Biomedical Imaging Science - The Administrative Boards
... 1. Describe the Certificate Program and provide a statement of educational objectives. Biomedical Imaging is a critical area of research with far reaching clinical translational opportunities in several areas including cancer, developmental science, genetics, pharmacology, and neuroscience. The broa ...
... 1. Describe the Certificate Program and provide a statement of educational objectives. Biomedical Imaging is a critical area of research with far reaching clinical translational opportunities in several areas including cancer, developmental science, genetics, pharmacology, and neuroscience. The broa ...
Computed Tomography Radiation Safety Issues in Ontario
... substantially over the past decade, resulting in growing concern over the radiation dose from CT. CT technological advances, such as the 64-slice CT scanner released in 2005, have led to new clinical CT applications that could result in further increases in patient radiation dose. Purpose of this Re ...
... substantially over the past decade, resulting in growing concern over the radiation dose from CT. CT technological advances, such as the 64-slice CT scanner released in 2005, have led to new clinical CT applications that could result in further increases in patient radiation dose. Purpose of this Re ...
Mammography
... Grids are used to reject scatter. The grid is placed between the breast and the image receptor. Linear grids with a grid ratio of 4:1 to 5:1 are typical. Cellular grids used by one manufacturer. Higher grid ratios provide greater x-ray scatter removal but also a greater dose penalty. Organic fiber o ...
... Grids are used to reject scatter. The grid is placed between the breast and the image receptor. Linear grids with a grid ratio of 4:1 to 5:1 are typical. Cellular grids used by one manufacturer. Higher grid ratios provide greater x-ray scatter removal but also a greater dose penalty. Organic fiber o ...
Imaging dose from cone beam computed tomography in radiation
... many have investigated the magnitude of this dose by measurements and calculations. The distribution of papers published on imaging dose from CBCT per year is shown in Fig. 1. This figure only includes papers in peer-reviewed publications with complete methods and results sections. In addition to the ...
... many have investigated the magnitude of this dose by measurements and calculations. The distribution of papers published on imaging dose from CBCT per year is shown in Fig. 1. This figure only includes papers in peer-reviewed publications with complete methods and results sections. In addition to the ...
Magnetic Resonance Imaging in the Detection of Myocardial Viability
... which produces a strong magnetic field, typically 1.5 Tesla, which is about 30000 times the strength of the earth’s magnetic field. When a scanning sequence starts, electromagnetic energy is transmitted as a radiofrequency pulse from a transmitting coil to the body nuclei, at the resonant frequency, ...
... which produces a strong magnetic field, typically 1.5 Tesla, which is about 30000 times the strength of the earth’s magnetic field. When a scanning sequence starts, electromagnetic energy is transmitted as a radiofrequency pulse from a transmitting coil to the body nuclei, at the resonant frequency, ...
Evaluation and Validation of Computed Tomography Dose Accuracy
... fixed exposure parameter of 130kVp and varying tube current-time products from 140mAs to 300mAs for the CT head phantom examination, there were varying deviations in both the CTDIw and CTDIvol from the two techniques. Tube currents of 140 mAs, 240 mAs and 300 mAs yielded 3.5%, 0.61% and -6.45% devia ...
... fixed exposure parameter of 130kVp and varying tube current-time products from 140mAs to 300mAs for the CT head phantom examination, there were varying deviations in both the CTDIw and CTDIvol from the two techniques. Tube currents of 140 mAs, 240 mAs and 300 mAs yielded 3.5%, 0.61% and -6.45% devia ...
Clinical use of electronic portal imaging: Report of AAPM Radiation
... electronic portal imaging devices 共EPIDs兲. The modern era of electronic portal imaging began in the early 1980s with demonstration by the late Norman Baily of the use of a fluoroscopic system to acquire megavoltage transmission images.27 The introduction of the scanning liquid ionization chamber sys ...
... electronic portal imaging devices 共EPIDs兲. The modern era of electronic portal imaging began in the early 1980s with demonstration by the late Norman Baily of the use of a fluoroscopic system to acquire megavoltage transmission images.27 The introduction of the scanning liquid ionization chamber sys ...
Upright Open MRI Centres
... supine, non- weight-bearing position and as a result may not detect pathology that becomes visible only when the patient is scanned in an upright position. Upright Open MRI scanners have clear advantages over supine imaging and may be used as first line MRI for the spine or as an adjunct if supine M ...
... supine, non- weight-bearing position and as a result may not detect pathology that becomes visible only when the patient is scanned in an upright position. Upright Open MRI scanners have clear advantages over supine imaging and may be used as first line MRI for the spine or as an adjunct if supine M ...
Finger fractures imaging: accuracy of cone-beam
... The major mechanism of injury in the DIP, PIP, and MCP joints is represented by hyperextension combined with longitudinal compression: a wide variety of treatment options exist, and the choice is based on the clinical presentation, presence and degree of displacement of bone fragments, articular sur ...
... The major mechanism of injury in the DIP, PIP, and MCP joints is represented by hyperextension combined with longitudinal compression: a wide variety of treatment options exist, and the choice is based on the clinical presentation, presence and degree of displacement of bone fragments, articular sur ...
3D Accuitomo FPD – XYZ Slice View Tomography Clinical
... resolution of both detectors is equally high. The FP detector is equipped with a collimation system that allows use of two different field sizes. So, when the FP detector is used, the field size and the dosage level can be selected according to ...
... resolution of both detectors is equally high. The FP detector is equipped with a collimation system that allows use of two different field sizes. So, when the FP detector is used, the field size and the dosage level can be selected according to ...
Verification and correction of geometrical uncertainties in
... group with electronic portal imaging device and proper correction strategy enables to predict, minimize, and keep under control the amount for most of geometrical errors; it also improves the preciseness of treatment and consequent results. Nature and characteristics of most frequent geometrical err ...
... group with electronic portal imaging device and proper correction strategy enables to predict, minimize, and keep under control the amount for most of geometrical errors; it also improves the preciseness of treatment and consequent results. Nature and characteristics of most frequent geometrical err ...
Nuclear medicine
Nuclear medicine is a medical specialty involving the application of radioactive substances in the diagnosis and treatment of disease. Nuclear medicine scans are usually conducted by radiographers. Nuclear medicine, in a sense, is ""radiology done inside out"" or ""endoradiology"" because it records radiation emitting from within the body rather than radiation that is generated by external sources like X-rays.