Introduction to medical imaging
... • In general, CT images are only obtained after a problem has been identified with a single projection X-ray or ultrasound image; however, there are clinical situations (a head injury, for example) in which the clinician will request a CT image as the first investigation. • CT is particularly useful ...
... • In general, CT images are only obtained after a problem has been identified with a single projection X-ray or ultrasound image; however, there are clinical situations (a head injury, for example) in which the clinician will request a CT image as the first investigation. • CT is particularly useful ...
![Advantages of monochromatic x-rays for imaging [5745-125]](http://s1.studyres.com/store/data/004013408_1-02c726a5fb71254eeb8fd4a8e3fd4859-300x300.png)
Advantages of monochromatic x-rays for imaging [5745-125]
... explained by the beam pathway and the fact that the polychromatic X-rays are emitted from a well-defined focus point resulting in a sharp image. The monochromatic X-rays must have been reflected by the HOPG crystal which consists of numerous crystallites with a mosaicity of 0.4°. This results in a b ...
... explained by the beam pathway and the fact that the polychromatic X-rays are emitted from a well-defined focus point resulting in a sharp image. The monochromatic X-rays must have been reflected by the HOPG crystal which consists of numerous crystallites with a mosaicity of 0.4°. This results in a b ...
Diagnostic X ray equipments
... principle by beveling the anode (anode angle) the effective area of target can be made much smaller than the actual area of electron interaction. The lower is the anode angle; the smaller is effective focal spot size. For general radiography the target angle is usually not less than 15 o ...
... principle by beveling the anode (anode angle) the effective area of target can be made much smaller than the actual area of electron interaction. The lower is the anode angle; the smaller is effective focal spot size. For general radiography the target angle is usually not less than 15 o ...
BasisandPurposeAttachment2009-00806
... that is defensible at a minimum while assuring that technological innovation is not constrained. For example, quality control for monitor images raises complex questions about how best to avoid repeat exposures due to poor image quality. Fluoroscopy, especially pediatric fluoroscopy, has emerged as ...
... that is defensible at a minimum while assuring that technological innovation is not constrained. For example, quality control for monitor images raises complex questions about how best to avoid repeat exposures due to poor image quality. Fluoroscopy, especially pediatric fluoroscopy, has emerged as ...
Medical radiation exposure and accidents. Dosimetry and radiation
... Many years ago, Hippocrates the father of medicine suggested to medical practitioners: “to benefit not harm the patients” [1]. Sometime ago, medical radiation exposure (MRE) constituted only about 15%-20% of the overall average dose we received from natural radiation, derived from earth, the cosmic ...
... Many years ago, Hippocrates the father of medicine suggested to medical practitioners: “to benefit not harm the patients” [1]. Sometime ago, medical radiation exposure (MRE) constituted only about 15%-20% of the overall average dose we received from natural radiation, derived from earth, the cosmic ...
Characterization of an x-ray phase contrast imaging
... reason for this is that the fraction of x-rays produced by the material (carbon filament and glue) that is used for mounting the target in the electron beam is more than 25% of the total amount of x-rays produced. This increases the apparent source size. The measured phase-contrast is at maximum two ...
... reason for this is that the fraction of x-rays produced by the material (carbon filament and glue) that is used for mounting the target in the electron beam is more than 25% of the total amount of x-rays produced. This increases the apparent source size. The measured phase-contrast is at maximum two ...
RADIATION PROTECTION IN DIAGNOSTIC RADIOLOGY
... Optimization of CT practice • Optimal use of ionizing radiation involves the interplay of the imaging process: Diagnostic quality of the CT image Radiation dose to the patient Choice of radiological technique ...
... Optimization of CT practice • Optimal use of ionizing radiation involves the interplay of the imaging process: Diagnostic quality of the CT image Radiation dose to the patient Choice of radiological technique ...
Iterative reconstruction in single source dual-energy CT
... Evaluation was made only on quantitative and qualitative levels, with no comparison of diagnostic accuracy to a reference standard. However, CTPA is now the standard of care for suspected PE in the emergency setting, and DE-CTPA is already well established as being more efficient than single energy ...
... Evaluation was made only on quantitative and qualitative levels, with no comparison of diagnostic accuracy to a reference standard. However, CTPA is now the standard of care for suspected PE in the emergency setting, and DE-CTPA is already well established as being more efficient than single energy ...
A Hybrid Approach for Accurate Estimation of the Scatter
... with the possibility of K- and L-shell fluorescent emission or Auger electron, coherent and incoherent scattering and pair production all together. In the first step, the user is supposed to provide an input file which includes information about the problem such as geometry specification, materials ...
... with the possibility of K- and L-shell fluorescent emission or Auger electron, coherent and incoherent scattering and pair production all together. In the first step, the user is supposed to provide an input file which includes information about the problem such as geometry specification, materials ...
Reducing Unnecessary Medical Imaging Exposure
... Technology Assessment Institute: Summit on CT Dose ...
... Technology Assessment Institute: Summit on CT Dose ...
Improving patient dose management using
... Communications in Medicine) standards produce images with relevant technical and dosimetric information contained in their DICOM header file. This information allows the audit of clinical protocols and the improvement of patient dose management especially during fluoroscopically guided procedures in ...
... Communications in Medicine) standards produce images with relevant technical and dosimetric information contained in their DICOM header file. This information allows the audit of clinical protocols and the improvement of patient dose management especially during fluoroscopically guided procedures in ...
essentials-of-dental-radiography-9th-edition-thomson
... 10. d. Panoramic radiography became popular in the 1960s with the introduction of the panoramic x-ray machine. 11. c. While cone beam volumetric imaging dedicated to dental applications produces less radiation doses than conventional CT scans, the dose is still 4 to 15 times that required for a pano ...
... 10. d. Panoramic radiography became popular in the 1960s with the introduction of the panoramic x-ray machine. 11. c. While cone beam volumetric imaging dedicated to dental applications produces less radiation doses than conventional CT scans, the dose is still 4 to 15 times that required for a pano ...
MINISTRY OF EDUCATION AND SCIENCE OF THE RUSSIAN
... 1. Independently recognize ray images of human organs taking into account the method of Medina visualization on radiographs, angiograms, ultrosonogram, CT and MRI tomograms. 2. Independently interpret the results of the various radiation imaging techniques: a) of the chest (lungs, heart and major bl ...
... 1. Independently recognize ray images of human organs taking into account the method of Medina visualization on radiographs, angiograms, ultrosonogram, CT and MRI tomograms. 2. Independently interpret the results of the various radiation imaging techniques: a) of the chest (lungs, heart and major bl ...
Distributed source x-ray tube technology for
... clinical workflow. IGRT allows more precise dose delivery and this enables a treatment prescription using fewer treatment fractions with a higher dose per fraction. A stationary x-ray tube for IGRT has been developed and manufactured in collaboration of XinRay Systems with Siemens Oncology Care Syst ...
... clinical workflow. IGRT allows more precise dose delivery and this enables a treatment prescription using fewer treatment fractions with a higher dose per fraction. A stationary x-ray tube for IGRT has been developed and manufactured in collaboration of XinRay Systems with Siemens Oncology Care Syst ...
DRAFT TEMPLATE - American College of Radiology
... examination involving ionizing radiation. Deterministic radiation risks are typically the primary concern due to the size of the patient and the relatively large skin doses that occur. Since stochastic effects may not develop until decades after the examination, older, seriously ill adults may not s ...
... examination involving ionizing radiation. Deterministic radiation risks are typically the primary concern due to the size of the patient and the relatively large skin doses that occur. Since stochastic effects may not develop until decades after the examination, older, seriously ill adults may not s ...
CT Lecture 1 - Lorentz Center
... Beam hardening • Another way of thinking about it – Preferential to total attenuation of low-energy x-rays – Makes short x-ray paths equivalent to long ones – Thus they appear denser, ergo brighter ...
... Beam hardening • Another way of thinking about it – Preferential to total attenuation of low-energy x-rays – Makes short x-ray paths equivalent to long ones – Thus they appear denser, ergo brighter ...
CT Radiation Dose Reduction by Modifying Primary Factors
... noise increases, as does image contrast, particularly between water and positive contrast media. For high-contrast situations or regions, such as CT angiography or chest CT, lower tube potential does not necessitate a concomitant increase in tube current. In certain low-contrast situations, such as ...
... noise increases, as does image contrast, particularly between water and positive contrast media. For high-contrast situations or regions, such as CT angiography or chest CT, lower tube potential does not necessitate a concomitant increase in tube current. In certain low-contrast situations, such as ...
ACR Technical Standard for Diagnostic Medical Physics
... most appropriate imaging procedures to prevent unwarranted radiation exposure. Facilities should have and adhere to policies and procedures that require varying ionizing radiation examination protocols (plain radiography, fluoroscopy, interventional radiology, CT) to take into account patient body h ...
... most appropriate imaging procedures to prevent unwarranted radiation exposure. Facilities should have and adhere to policies and procedures that require varying ionizing radiation examination protocols (plain radiography, fluoroscopy, interventional radiology, CT) to take into account patient body h ...
Application of Cone Beam Computed Tomography Imaging to
... dedicated to imaging the maxillofacial region heralds a true paradigm shift from 1. 2D to 3D approach to data acquisition and 2. Also provides opportunities for dental practitioners to request multiplanar imaging. ...
... dedicated to imaging the maxillofacial region heralds a true paradigm shift from 1. 2D to 3D approach to data acquisition and 2. Also provides opportunities for dental practitioners to request multiplanar imaging. ...
Radiation Safety and Physics
... procedures, wearing an apron is not necessary since the surgeon and technologist can stand behind a leaded glass partition some distance from the radiation source while taking images. The radiation received there is negligible. When using a specimen radiography unit, the shielding in the unit reduce ...
... procedures, wearing an apron is not necessary since the surgeon and technologist can stand behind a leaded glass partition some distance from the radiation source while taking images. The radiation received there is negligible. When using a specimen radiography unit, the shielding in the unit reduce ...
A short reader`s guide to 3D tomographic reconstruction
... With all converging collimators (except fan-beam collimators), the data collected cannot be separated into independent 2D slices, and fully 3D reconstruction algorithms are required. In fact, even with parallel and fan-beam collimators, an accurate modeling of the collimator response and of the scat ...
... With all converging collimators (except fan-beam collimators), the data collected cannot be separated into independent 2D slices, and fully 3D reconstruction algorithms are required. In fact, even with parallel and fan-beam collimators, an accurate modeling of the collimator response and of the scat ...
ORION laser target diagnostics
... unique combined long pulse/short pulse laser capability which is not only available to AWE personnel but also gives access to our international partners and visiting UK academia. The ORION laser facility is equipped with a comprehensive suite of some 45 diagnostics covering optical, particle, and x- ...
... unique combined long pulse/short pulse laser capability which is not only available to AWE personnel but also gives access to our international partners and visiting UK academia. The ORION laser facility is equipped with a comprehensive suite of some 45 diagnostics covering optical, particle, and x- ...
DAP and effective dose
... From: E. Bogaert et al., A large-scale multicentre study of patient skin doses in interventional cardiology: dose-area product action levels and dose reference levels, 2009 ...
... From: E. Bogaert et al., A large-scale multicentre study of patient skin doses in interventional cardiology: dose-area product action levels and dose reference levels, 2009 ...
X-ray tube in CT scanner
... X-ray tube function: As with any vacuum tube, there is a cathode to emit electrons into the vacuum and an anode to collect the electrons, thus establishing a flow of electrical current through the tube. A high voltage power source is connected across cathode and anode, for example 30 to 150 kilovol ...
... X-ray tube function: As with any vacuum tube, there is a cathode to emit electrons into the vacuum and an anode to collect the electrons, thus establishing a flow of electrical current through the tube. A high voltage power source is connected across cathode and anode, for example 30 to 150 kilovol ...
CT Accreditation Program: Image Quality and Dose
... The qualified medical physicist plays an essential role in the accreditation program, as he or she must perform initial performance testing upon installation of a CT system, supervise the ongoing equipment quality control program, be available for consultations relating to radiation dose to the pati ...
... The qualified medical physicist plays an essential role in the accreditation program, as he or she must perform initial performance testing upon installation of a CT system, supervise the ongoing equipment quality control program, be available for consultations relating to radiation dose to the pati ...
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"".