- The University of Liverpool Repository
... letters ‘R’ and ‘L’ to indicate the side of anatomy imaged on radiographs1. ASM’s can be added on the receptor prior to X-ray emission using either pre-exposure ASM’s2, or else inserted afterwards using post-processing ASM’s3. Incorrect use of pre-exposure ASMs is classified, as one of the most comm ...
... letters ‘R’ and ‘L’ to indicate the side of anatomy imaged on radiographs1. ASM’s can be added on the receptor prior to X-ray emission using either pre-exposure ASM’s2, or else inserted afterwards using post-processing ASM’s3. Incorrect use of pre-exposure ASMs is classified, as one of the most comm ...
Lecture 8 - Mammography and tomosynthesis
... • Justification for the NHSBSP is based on the net benefit to the population, not the individual • However, this makes patient dose optmisation and quality assurance (QA) critical to effectiveness of the programme – QA also important due to the basic principles of mammography e.g. low kV, high spati ...
... • Justification for the NHSBSP is based on the net benefit to the population, not the individual • However, this makes patient dose optmisation and quality assurance (QA) critical to effectiveness of the programme – QA also important due to the basic principles of mammography e.g. low kV, high spati ...
Scatter Correction Method for X-Ray CT Using Primary Modulation
... software-based methods estimates and corrects for the scatter based on the system geometry and imaged object, and it has been shown for some applications that effective scatter control can be achieved [12]–[19]. To combine the strengths of different types of correction methods, hybrid approaches are ...
... software-based methods estimates and corrects for the scatter based on the system geometry and imaged object, and it has been shown for some applications that effective scatter control can be achieved [12]–[19]. To combine the strengths of different types of correction methods, hybrid approaches are ...
PS 3.17 - Dicom
... NEMA disclaims liability for any personal injury, property, or other damages of any nature whatsoever, whether special, indirect, consequential, or compensatory, directly or indirectly resulting from the publication, use of, application, or reliance on this document. NEMA disclaims and makes no guar ...
... NEMA disclaims liability for any personal injury, property, or other damages of any nature whatsoever, whether special, indirect, consequential, or compensatory, directly or indirectly resulting from the publication, use of, application, or reliance on this document. NEMA disclaims and makes no guar ...
Detection of pulmonary nodules in chest tomosynthesis
... sensitivity, as overlapping anatomy may obscure pathology3–5. Computed tomography (CT), which was introduced to healthcare in the 1970s, is a 3-dimensional technique providing parallel sections of the body, and obscuring anatomy can thus be eliminated. Structures of interest may, therefore, be more ...
... sensitivity, as overlapping anatomy may obscure pathology3–5. Computed tomography (CT), which was introduced to healthcare in the 1970s, is a 3-dimensional technique providing parallel sections of the body, and obscuring anatomy can thus be eliminated. Structures of interest may, therefore, be more ...
medical physics international
... colleagues. The web statistics of www.mpijournal.org shows that for the first three months of the life of the Journal (2/04/2013 – 19/07/2013) the journal web site had 12,474 visitors. Papers from all sections of the MPI Journal have been downloaded hundreds of times, what shows that the constructio ...
... colleagues. The web statistics of www.mpijournal.org shows that for the first three months of the life of the Journal (2/04/2013 – 19/07/2013) the journal web site had 12,474 visitors. Papers from all sections of the MPI Journal have been downloaded hundreds of times, what shows that the constructio ...
European Guidelines on DRLs for Paediatric Imaging
... Diagnostic reference levels (DRLs) have been recommended by the International Commission on Radiological Protection (ICRP) (ICRP, 1991; 1996; 2001; 2007a; 2007b; 2013) as an advisory measure to improve optimization of patient protection, by identifying high patient dose levels which might not be jus ...
... Diagnostic reference levels (DRLs) have been recommended by the International Commission on Radiological Protection (ICRP) (ICRP, 1991; 1996; 2001; 2007a; 2007b; 2013) as an advisory measure to improve optimization of patient protection, by identifying high patient dose levels which might not be jus ...
2016 technical summaries
... allows for tomographic images to be portrayed in any orientation. We have conducted research to determine the resolution of tomosynthesis MPR. We built a phantom that houses a star test pattern to measure resolution. This phantom provides three rotational degrees of freedom. The design consists of t ...
... allows for tomographic images to be portrayed in any orientation. We have conducted research to determine the resolution of tomosynthesis MPR. We built a phantom that houses a star test pattern to measure resolution. This phantom provides three rotational degrees of freedom. The design consists of t ...
Cone Beam Ct for Dental and Maxillofacial Radiology
... tremendous benefit to patients around the world. This development is very pronounced in the Computed Tomography (CT), which is today a well-established diagnostic tool in many areas of medicine. New applications of CT, sometimes in areas where they were hardly expected, are still coming into existen ...
... tremendous benefit to patients around the world. This development is very pronounced in the Computed Tomography (CT), which is today a well-established diagnostic tool in many areas of medicine. New applications of CT, sometimes in areas where they were hardly expected, are still coming into existen ...
cone beam ct for dental and maxillofacial radiology
... models; research evidence for one CBCT machine may not apply to other equipment. As a consequence, caution is needed in generalising research findings. Many of the recommendations made are “Best Practice” rather than carrying any formal evidence grade, based upon the informed judgement of the Guidel ...
... models; research evidence for one CBCT machine may not apply to other equipment. As a consequence, caution is needed in generalising research findings. Many of the recommendations made are “Best Practice” rather than carrying any formal evidence grade, based upon the informed judgement of the Guidel ...
An X-ray Source Model and Characterization Method for Computing
... minimizing the irradiation of healthy tissues. While this conformality increases the radiation treatment plan quality, it also causes higher dose gradients near the edges of the treated area. These plans therefore require more precise patient positioning[135, 35]. Historically, patients were positio ...
... minimizing the irradiation of healthy tissues. While this conformality increases the radiation treatment plan quality, it also causes higher dose gradients near the edges of the treated area. These plans therefore require more precise patient positioning[135, 35]. Historically, patients were positio ...
evaluation of elegp collimator with resolution recovery for spect/ct
... twentieth century. Since then there has been many significant advances in nuclear medicine technology and it has become increasingly more common as a tool for diagnostic imaging [1]. An example of such an advance is the method of creating 3D images with single photon emission computed tomography (SP ...
... twentieth century. Since then there has been many significant advances in nuclear medicine technology and it has become increasingly more common as a tool for diagnostic imaging [1]. An example of such an advance is the method of creating 3D images with single photon emission computed tomography (SP ...
American Association of Physicists in Medicine 40th Annual
... This is a landmark year for the Annual Meeting for two prominent reasons. For the first time, both the positions of Scientific Program Director and Co-Director are filled by women members of the Association. Drs. Mary Martel and Maryellen Giger have worked diligently to develop an outstanding scient ...
... This is a landmark year for the Annual Meeting for two prominent reasons. For the first time, both the positions of Scientific Program Director and Co-Director are filled by women members of the Association. Drs. Mary Martel and Maryellen Giger have worked diligently to develop an outstanding scient ...
Measurements of void fraction distribution in cavitating pipe flow
... visualize the inside of the cavitation region with visible light, it is shown that with x-ray computed tomography (CT) it is possible to capture the time-averaged void fraction distribution in a quasi-steady pipe flow. Different types of cavitation have been investigated including cloud-like cavitat ...
... visualize the inside of the cavitation region with visible light, it is shown that with x-ray computed tomography (CT) it is possible to capture the time-averaged void fraction distribution in a quasi-steady pipe flow. Different types of cavitation have been investigated including cloud-like cavitat ...
comparison of 3d and 4d cbct for the localization of moving targets
... Figure 3.8: 3D CBCT images of the Small I/E patient model (left) and the Large I/E patient model (right). The Small I/E model experiences significant blurring at only one extreme (inhale, bottom) and the Large I/E model experiences significant blurring at both extremes of motion. ................... ...
... Figure 3.8: 3D CBCT images of the Small I/E patient model (left) and the Large I/E patient model (right). The Small I/E model experiences significant blurring at only one extreme (inhale, bottom) and the Large I/E model experiences significant blurring at both extremes of motion. ................... ...
IHE Technical Framework, vol. I: Integration Profiles
... established messaging standards to achieve specific clinical goals. It includes a rigorous testing process for the implementation of this framework. And it organizes educational sessions and exhibits at major meetings of medical professionals to demonstrate the benefits of this framework and encoura ...
... established messaging standards to achieve specific clinical goals. It includes a rigorous testing process for the implementation of this framework. And it organizes educational sessions and exhibits at major meetings of medical professionals to demonstrate the benefits of this framework and encoura ...
LightSpeed™ VCT - Spectrum Medical X
... LightSpeed VCT LightSpeed VCT XT LightSpeed VCT XTe © 2011 General Electric Company. All rights reserved. This product is certified as a LightSpeed™ Multislice CT System. The MHLW certified number is 21100BZY00104000 ...
... LightSpeed VCT LightSpeed VCT XT LightSpeed VCT XTe © 2011 General Electric Company. All rights reserved. This product is certified as a LightSpeed™ Multislice CT System. The MHLW certified number is 21100BZY00104000 ...
PACS Implementation Guide - UK Imaging Informatics Group
... communication, have progressed to the point that it is now possible to acquire medical images in digital form, archive them on computer systems, and display them in diagnostic quality. The display monitor used to present the images can be at an adjacent or distant location to the original point of a ...
... communication, have progressed to the point that it is now possible to acquire medical images in digital form, archive them on computer systems, and display them in diagnostic quality. The display monitor used to present the images can be at an adjacent or distant location to the original point of a ...
pet/ct atlas on quality control and image artefacts
... part by combining PET tomographs with computed tomography (CT) systems into a single gantry-based PET/CT imaging device. PET/CT systems became commercially available in 2001. Since then, over 5000 systems have been installed worldwide, with the number growing continuously and with most clinical PET- ...
... part by combining PET tomographs with computed tomography (CT) systems into a single gantry-based PET/CT imaging device. PET/CT systems became commercially available in 2001. Since then, over 5000 systems have been installed worldwide, with the number growing continuously and with most clinical PET- ...
Fluoroscopy
Fluoroscopy /flɔrˈɒskəpi/ is an imaging technique that uses X-rays to obtain real-time moving images of the interior of an object. In its primary application of medical imaging, a fluoroscope /ˈflɔrɵˌskoʊp/ allows a physician to see the internal structure and function of a patient, so that the pumping action of the heart or the motion of swallowing, for example, can be watched. This is useful for both diagnosis and therapy and occurs in general radiology, interventional radiology, and image-guided surgery. In its simplest form, a fluoroscope consists of an X-ray source and a fluorescent screen, between which a patient is placed. However, since the 1950s most fluoroscopes have included X-ray image intensifiers and cameras as well, to improve the image's visibility and make it available on a remote display screen. For many decades fluoroscopy tended to produce live pictures that were not recorded, but since the 1960s, as technology improved, recording and playback became the norm.Fluoroscopy is similar to radiography and X-ray computed tomography (X-ray CT) in that it generates images using X-rays. The original difference was that radiography fixed still images on film whereas fluoroscopy provided live moving pictures that were not stored. However, today radiography, CT, and fluoroscopy are all digital imaging modes with image analysis software and data storage and retrieval. The use of X-rays, a form of ionizing radiation, requires the potential risks from a procedure to be carefully balanced with the benefits of the procedure to the patient. Because the patient must be exposed to a continuous source of x-rays instead of a momentary pulse, a fluoroscopy procedure generally subjects a patient to a higher absorbed dose of radiation than an ordinary (still) radiograph. Much research has been directed toward reducing radiation exposure, and recent advances in fluoroscopy technology such as digital image processing and flat panel detectors, have resulted in much lower radiation doses than former procedures.The type of fluoroscopy used in airport security (to check for hidden weapons or bombs) uses lower doses of radiation than medical fluoroscopy. It was formerly also used in retail stores in the form of shoe-fitting fluoroscopes, but such use was discontinued because it is no longer considered acceptable to use radiation exposure, however small the dose, for nonessential purposes. Only important applications such as health care, bodily safety, food safety, nondestructive testing, and scientific research meet the risk-benefit threshold for use. The reason for higher doses in medical applications is that they are more demanding about tissue contrast, and for the same reason they sometimes require contrast media.