上海交通大学医学院 教 案 课程名称 Medical Imaging 2008年3月1日
... increasing the area of the patient that can be covered in a given time by the x-ray beam. Available systems have moved from two slices to 64 slices, which covers 40 mm of patient length for each 1-second or less rotation of the tube. Prototype 256-detector scanners are being developed. The key advan ...
... increasing the area of the patient that can be covered in a given time by the x-ray beam. Available systems have moved from two slices to 64 slices, which covers 40 mm of patient length for each 1-second or less rotation of the tube. Prototype 256-detector scanners are being developed. The key advan ...
Projection-based Material Decomposition by Machine Learning
... Energy-selective photo-counting detectors yield CT projection data with multiple image channels. Therefore, the pixel intensity values of each image channel can be used as training features to build the classifiers [1]. This results in three features per pixel in this study. The second approach is p ...
... Energy-selective photo-counting detectors yield CT projection data with multiple image channels. Therefore, the pixel intensity values of each image channel can be used as training features to build the classifiers [1]. This results in three features per pixel in this study. The second approach is p ...
locally fabricated metal step wedge for quality assurance in
... Radiology is the medical applications of this radiant energy to improve health care, as in radiography, mammography, radiotherapy, and so on. The main aim of diagnostic radiology is to produce a picture in the form of shadows of varying degrees of blackness (grayness) of particular anatomical struct ...
... Radiology is the medical applications of this radiant energy to improve health care, as in radiography, mammography, radiotherapy, and so on. The main aim of diagnostic radiology is to produce a picture in the form of shadows of varying degrees of blackness (grayness) of particular anatomical struct ...
Brilliance iCT - Philips InCenter
... demonstrated the robustness and diagnostic accuracy of MDCT angiography (MDCTA) for the detection of coronary artery disease (CAD) [1-3], the increased mid-term prognostic value of MDCTA [4] and the positive impact of MDCTA on clinical decision making in the emergency room [5-8]. The combination of ...
... demonstrated the robustness and diagnostic accuracy of MDCT angiography (MDCTA) for the detection of coronary artery disease (CAD) [1-3], the increased mid-term prognostic value of MDCTA [4] and the positive impact of MDCTA on clinical decision making in the emergency room [5-8]. The combination of ...
IGRT in CMUH
... • Kilovoltage cone-beam CT (kV CBCT) • Megavoltage cone-beam CT (MV CBCT) • Megavoltage fan-beam CT (MV CT) • Korreman S, Rasch C, McNair H et al. The European Society of Therapeutic Radiology and Oncology– European Institute of Radiotherapy (ESTRO–EIR) report on 3D CT-based in-room image guidance s ...
... • Kilovoltage cone-beam CT (kV CBCT) • Megavoltage cone-beam CT (MV CBCT) • Megavoltage fan-beam CT (MV CT) • Korreman S, Rasch C, McNair H et al. The European Society of Therapeutic Radiology and Oncology– European Institute of Radiotherapy (ESTRO–EIR) report on 3D CT-based in-room image guidance s ...
Considerations Regarding Radiation Exposure in
... achieve this range. Many PET-CT devices default to 140 kVp for attenuation correction scans; however, reduction to 80-120 kVp can significantly reduce the dose and should be considered in adult patients. 20,21,22,23 Lower tube currents and exposure times (as low as 16-50 mAs) may also be used to dec ...
... achieve this range. Many PET-CT devices default to 140 kVp for attenuation correction scans; however, reduction to 80-120 kVp can significantly reduce the dose and should be considered in adult patients. 20,21,22,23 Lower tube currents and exposure times (as low as 16-50 mAs) may also be used to dec ...
Poster - Indico
... • The proton range verification with x-ray imaging using single CZT detector, as described in this paper could be a simple tool for accurate in vivo range verifications in proton therapy. • According to our simulations, it is achievable to use two CZT detectors system, which have different thickness ...
... • The proton range verification with x-ray imaging using single CZT detector, as described in this paper could be a simple tool for accurate in vivo range verifications in proton therapy. • According to our simulations, it is achievable to use two CZT detectors system, which have different thickness ...
exposurefactors
... is used to describe the mean energy or penetrating ability of the x-ray beam. – The quality is controlled by kilovoltage. Copyright © 2012, 2006, 2000, 1996 by Saunders, an imprint of Elsevier Inc. ...
... is used to describe the mean energy or penetrating ability of the x-ray beam. – The quality is controlled by kilovoltage. Copyright © 2012, 2006, 2000, 1996 by Saunders, an imprint of Elsevier Inc. ...
the First Positron Emission tomography–Magnetic Resonance
... quantitative evaluation (e.g. of a therapy response).10 Our preliminary experience shows that clinical PETMRI can achieve reasonable workflow and scanning time. Compared with PET-CT, PET-MRI can provide comparable anatomic and molecular information (Figures 5-7), but with much less radiation. Minimi ...
... quantitative evaluation (e.g. of a therapy response).10 Our preliminary experience shows that clinical PETMRI can achieve reasonable workflow and scanning time. Compared with PET-CT, PET-MRI can provide comparable anatomic and molecular information (Figures 5-7), but with much less radiation. Minimi ...
SOMATOM Definition AS - Delta Medical Systems
... Superior image quality is the sound foundation for precise contouring and accurate radiotherapy treatment planning. Computed Tomography is the first-choice diagnostic imaging method – supported by PET•CT and MR – and the basis for sustainable treatment planning in radiation therapy. The SOMATOM® Def ...
... Superior image quality is the sound foundation for precise contouring and accurate radiotherapy treatment planning. Computed Tomography is the first-choice diagnostic imaging method – supported by PET•CT and MR – and the basis for sustainable treatment planning in radiation therapy. The SOMATOM® Def ...
Role of CTDI to estimate patient dose from a single slice to multi
... are displayed on the CT scanner console. These values are obtained in the factory by scanning two acrylic cylinders (one with a 16-cm diameter, and the other with a 32-cm diameter) on a representative sample of each CT scanner. In clinical use, when the CT settings for a patient examination are sele ...
... are displayed on the CT scanner console. These values are obtained in the factory by scanning two acrylic cylinders (one with a 16-cm diameter, and the other with a 32-cm diameter) on a representative sample of each CT scanner. In clinical use, when the CT settings for a patient examination are sele ...
Optimization of pulsed fluoroscopy in pediatric
... In diagnostic radiology, this requires an increase in the radiation dose used to form the image for a single frame. Thus, when the frame rate is halved from continuous (25 full fps) to12.5 fps, the image intensifier dose rate must not be reduced to 50%, but to 80%, and at 6.25 Hz it must not be redu ...
... In diagnostic radiology, this requires an increase in the radiation dose used to form the image for a single frame. Thus, when the frame rate is halved from continuous (25 full fps) to12.5 fps, the image intensifier dose rate must not be reduced to 50%, but to 80%, and at 6.25 Hz it must not be redu ...
Principles of CT: Multislice CT
... current in milliamperes · scan time in seconds) or less per rotation, yielding low-quality, noisy images. A straightforward solution to this heat issue, of course, is to develop x-ray tubes with a higher heat capacity; such tubes have been asnd continue to be developed. Another approach is to more e ...
... current in milliamperes · scan time in seconds) or less per rotation, yielding low-quality, noisy images. A straightforward solution to this heat issue, of course, is to develop x-ray tubes with a higher heat capacity; such tubes have been asnd continue to be developed. Another approach is to more e ...
National Diagnostic Reference Levels Factsheet
... It should be noted that these effective dose conversions are to be used with caution. They should not be applied to an individual but rather are statistical estimates of a dose and risk to a population who may receive that dose. ...
... It should be noted that these effective dose conversions are to be used with caution. They should not be applied to an individual but rather are statistical estimates of a dose and risk to a population who may receive that dose. ...
RESEARCH ARTICLE New Directions in X
... Department of Physics, University of California, Berkeley, CA, USA ...
... Department of Physics, University of California, Berkeley, CA, USA ...
Ch 1 Basic Imaging Principles
... The x-rays are collimated (restricted in their geometric spread) to travel within an approximate 2-D “Fan beam” CT collects multiple projections of the same tissues from different orientations by moving the x-ray source around the body. CT systems have rows of digital detectors whose signals are inp ...
... The x-rays are collimated (restricted in their geometric spread) to travel within an approximate 2-D “Fan beam” CT collects multiple projections of the same tissues from different orientations by moving the x-ray source around the body. CT systems have rows of digital detectors whose signals are inp ...
diabetes - NC State University
... 1. Physics and Chemistry of Radiation Absorption (3.1.*) 1. Differentiate between molecular excitation and ionization (3.1.1) 2. Differentiate between particulate and electromagnetic (non-particulate) forms of radiation (3.1.2) 3. Differentiate between the sites of origin of gamma rays and x-rays (3 ...
... 1. Physics and Chemistry of Radiation Absorption (3.1.*) 1. Differentiate between molecular excitation and ionization (3.1.1) 2. Differentiate between particulate and electromagnetic (non-particulate) forms of radiation (3.1.2) 3. Differentiate between the sites of origin of gamma rays and x-rays (3 ...
Chapter 2 Scope of Coverage for Part I and Part II Resident Physicist
... There is a beta decay There is an alpha decay ...
... There is a beta decay There is an alpha decay ...
Chapter 4 DETECTORS FOR X-RAY IMAGING AND COMPUTED
... photodiode, and the pixel contacts are routed on that same side to one or two edges of the photodiode array. With the number of axial slices in the CT exceeding 32, the routing of the many pixel connections to the edges became more and more difficult. This problem is now addressed using backillumina ...
... photodiode, and the pixel contacts are routed on that same side to one or two edges of the photodiode array. With the number of axial slices in the CT exceeding 32, the routing of the many pixel connections to the edges became more and more difficult. This problem is now addressed using backillumina ...
Measurements, CAD, Radiation Dose and more
... Projection X-Ray (XA, CR, DX, MG) or CT • Conveys cumulative dose information as well as details of each irradiation event • The irradiation event is the “smallest” information entity recorded in the realm of Radiation Dose reporting – For example, a CT irradiation event is one continuous irradiatio ...
... Projection X-Ray (XA, CR, DX, MG) or CT • Conveys cumulative dose information as well as details of each irradiation event • The irradiation event is the “smallest” information entity recorded in the realm of Radiation Dose reporting – For example, a CT irradiation event is one continuous irradiatio ...
Slide 1 - Faculty
... slice sensitivity profile is a consequence of the finite widyh of the x-ray focal spot, the penumbra of the collimator, the fact that the image is computed from a number of projection angles encircling the patient, and other minor factors. ...
... slice sensitivity profile is a consequence of the finite widyh of the x-ray focal spot, the penumbra of the collimator, the fact that the image is computed from a number of projection angles encircling the patient, and other minor factors. ...
ACR White Paper on Radiation Dose in Medicine
... Ionizing radiation has been used for diagnostic purposes in medicine for more than a century. The benefits of noninvasive or minimally invasive procedures are integral to modern patient care and greatly exceed the associated risks. The development of remarkable equipment such as multidetector row CT ...
... Ionizing radiation has been used for diagnostic purposes in medicine for more than a century. The benefits of noninvasive or minimally invasive procedures are integral to modern patient care and greatly exceed the associated risks. The development of remarkable equipment such as multidetector row CT ...
Diagnostic X-rays and CT Scans
... • The number of photons removed depends on the material in which the photon is incident. • Removing photons from the beam produces the radiographic shadows in the detector material. • Compton scattered photons are usually useless for imaging since they won’t necessarily strike your detector. • T ...
... • The number of photons removed depends on the material in which the photon is incident. • Removing photons from the beam produces the radiographic shadows in the detector material. • Compton scattered photons are usually useless for imaging since they won’t necessarily strike your detector. • T ...
Backscatter X-ray
Backscatter X-ray is an advanced X-ray imaging technology. Traditional X-ray machines detect hard and soft materials by the variation in transmission through the target. In contrast, backscatter X-ray detects the radiation that reflects from the target. It has potential applications where less-destructive examination is required, and can be used if only one side of the target is available for examination.The technology is one of two types of whole body imaging technologies that have been used to perform full-body scans of airline passengers to detect hidden weapons, tools, liquids, narcotics, currency, and other contraband. A competing technology is millimeter wave scanner. An airport security machine of this type is also referred to as ""body scanner"", ""whole body imager (WBI)"", ""security scanner"", and ""naked scanner"".