Contrast medium administration and image acquisition parameters
... analysis and sophisticated manipulation of test bolus data with the ability to further reduce cardiovascular variability. However, complex algorithms have been difficult to translate into routine clinical practice and, therefore, are rarely used. Contrast bolus shaping. Shaping the CM bolus is vital ...
... analysis and sophisticated manipulation of test bolus data with the ability to further reduce cardiovascular variability. However, complex algorithms have been difficult to translate into routine clinical practice and, therefore, are rarely used. Contrast bolus shaping. Shaping the CM bolus is vital ...
Chapter 11: Computed Tomography - Human Health Campus
... When performing clinical studies over time, one should take into account that even on the same scanner, with time, a certain drift of the Hounsfield units may occur. In multicenter studies that involve different CT scanners, significant variations in the observed Hounsfield units may also occur betw ...
... When performing clinical studies over time, one should take into account that even on the same scanner, with time, a certain drift of the Hounsfield units may occur. In multicenter studies that involve different CT scanners, significant variations in the observed Hounsfield units may also occur betw ...
quantitative nuclear medicine imaging: concepts
... medicine. Nevertheless, the apparent complexity and sometimes limited accuracy of these methods have prevented them from being widely used in important applications such as targeted radionuclide therapy or kinetic analysis. The intricacy of the effects degrading nuclear medicine images and the lack ...
... medicine. Nevertheless, the apparent complexity and sometimes limited accuracy of these methods have prevented them from being widely used in important applications such as targeted radionuclide therapy or kinetic analysis. The intricacy of the effects degrading nuclear medicine images and the lack ...
Multilayer Energy Discriminating Detector for Medical X
... dual-energy subtraction (low- and high-energy images), however these methods suffer from artifacts due to patient motion between image acquisitions. In this research the use of a multilayer flat panel detector is examined for CEM that is designed to acquire both (low- and high-energy) images simulta ...
... dual-energy subtraction (low- and high-energy images), however these methods suffer from artifacts due to patient motion between image acquisitions. In this research the use of a multilayer flat panel detector is examined for CEM that is designed to acquire both (low- and high-energy) images simulta ...
Cone beam computed tomography: Adding three dimensions to
... is measured in Sieverts. CBCT has much lower effective dose of radiation when compared with traditional medical CT. CBCT dosages are largely determined by FOV, exposure beam type, technique settings (mA, kVp), beam geometry and amount of basis projections.[5] Published data on effective dose gives an ...
... is measured in Sieverts. CBCT has much lower effective dose of radiation when compared with traditional medical CT. CBCT dosages are largely determined by FOV, exposure beam type, technique settings (mA, kVp), beam geometry and amount of basis projections.[5] Published data on effective dose gives an ...
Diagnostic Imaging Quality Assurance
... The TRIAD Kit is a full-function, x-ray dosimeter kit that performs highly sensitive measurements in all modalities for x-ray field service, calibration, and quality assurance testing. The Model 10100A TRIAD Dosimeter Kit features the Model 35050A Dosimeter, a technologically advanced, microprocesso ...
... The TRIAD Kit is a full-function, x-ray dosimeter kit that performs highly sensitive measurements in all modalities for x-ray field service, calibration, and quality assurance testing. The Model 10100A TRIAD Dosimeter Kit features the Model 35050A Dosimeter, a technologically advanced, microprocesso ...
Clinical Training of Medical Physicists Specializing in Diagnostic
... international experts. The publication drew on the experiences of clinical training programmes in Australia and New Zealand, the UK and the USA, and was moderated by physicists working in the Asian region. This publication follows the approach of the IAEA publication Training Course Series No. 37, C ...
... international experts. The publication drew on the experiences of clinical training programmes in Australia and New Zealand, the UK and the USA, and was moderated by physicists working in the Asian region. This publication follows the approach of the IAEA publication Training Course Series No. 37, C ...
PAGE 6 - The Scanner Magazine
... software solutions. The company’s technology gives radiologists, cardiologists, oncologists and other medical specialists time-saving productivity and communications tools that can be accessed throughout the enterprise and via the Web for easy use in the day-to-day practice of medicine. Vital Images ...
... software solutions. The company’s technology gives radiologists, cardiologists, oncologists and other medical specialists time-saving productivity and communications tools that can be accessed throughout the enterprise and via the Web for easy use in the day-to-day practice of medicine. Vital Images ...
Quality Assurance for PET and PET/CT Systems
... fully three dimensional (3-D) PET systems that operate without interplane septa. These scanners were much more sensitive to scattering and randoms originating from radioactivity outside the field-of-view (FOV), and there was a need for performance tests that were more relevant to this mode of operat ...
... fully three dimensional (3-D) PET systems that operate without interplane septa. These scanners were much more sensitive to scattering and randoms originating from radioactivity outside the field-of-view (FOV), and there was a need for performance tests that were more relevant to this mode of operat ...
Mutual information based registration of medical images: a survey
... in the other image. Consequently, the intensity of the clusters for corresponding anatomical structures will decrease and new combinations of grey values emerge, such as skull and brain or skin and background. This will manifest itself in the joint histogram by a dispersion of the clustering. Figure ...
... in the other image. Consequently, the intensity of the clusters for corresponding anatomical structures will decrease and new combinations of grey values emerge, such as skull and brain or skin and background. This will manifest itself in the joint histogram by a dispersion of the clustering. Figure ...
Development of a Whole Body Atlas for Radiation Sharif Qatarneh
... In the following section, a background about major milestones in the latest developments of radiation therapy planning is given. The need for a whole body Atlas in radiation therapy planning is also discussed. In section 3, the structure of the whole body Atlas is outlined and the major components o ...
... In the following section, a background about major milestones in the latest developments of radiation therapy planning is given. The need for a whole body Atlas in radiation therapy planning is also discussed. In section 3, the structure of the whole body Atlas is outlined and the major components o ...
1 The Nature of Biomedical Images
... screen made of compounds of rare-earth elements such as lanthanum oxybromide or gadolinium oxysulfide. The X-ray photons are converted into visible-light photons. A light-sensitive film in contact with the screen (in a light-tight cassette) records the result. The film contains a layer of silver-hal ...
... screen made of compounds of rare-earth elements such as lanthanum oxybromide or gadolinium oxysulfide. The X-ray photons are converted into visible-light photons. A light-sensitive film in contact with the screen (in a light-tight cassette) records the result. The film contains a layer of silver-hal ...
radiation protection in diagnostic radiology - RPOP
... (digital or conventional fluoroscopy) in screening examinations may allow patient dose reductions ...
... (digital or conventional fluoroscopy) in screening examinations may allow patient dose reductions ...
Optimal parameters for clinical implementation of breast cancer
... the tumor cavity.(3-6) Breast cancer patient setup using surgical clips with kV radiography has been demonstrated to be beneficial.(6,7) However, the visibility of the clips in orthogonal kV radiographs strongly depends on the type of clip used (density, size, and material) and distance from the rib ...
... the tumor cavity.(3-6) Breast cancer patient setup using surgical clips with kV radiography has been demonstrated to be beneficial.(6,7) However, the visibility of the clips in orthogonal kV radiographs strongly depends on the type of clip used (density, size, and material) and distance from the rib ...
CT scanner automatic exposure control systems
... patients using an AEC, the tube voltage and current are set according to exam type, but the exposure time is automatically varied to compensate for differences in size and composition of each patient. ...
... patients using an AEC, the tube voltage and current are set according to exam type, but the exposure time is automatically varied to compensate for differences in size and composition of each patient. ...
Electromagnetic Tracking in the Clinical Environment:A
... generator can be positioned in the room in a flexible manner so that it does not restrict access to the patient or the mobility of medical staff and equipment. The reality however, is that there are currently no systems that facilitate tracking of sensors smaller than 2mm diameter, within a volume lar ...
... generator can be positioned in the room in a flexible manner so that it does not restrict access to the patient or the mobility of medical staff and equipment. The reality however, is that there are currently no systems that facilitate tracking of sensors smaller than 2mm diameter, within a volume lar ...
Policies Standards And Guidelines For Radiologic Technology
... the use of radionuclides to assist in diagnosis or treatment of diseases. Perform radiographic or nuclear medicine procedures and related techniques to produce images for the interpretation by and at the request of a licensed medical practitioner. 5.2. provide radiation therapy services as an essent ...
... the use of radionuclides to assist in diagnosis or treatment of diseases. Perform radiographic or nuclear medicine procedures and related techniques to produce images for the interpretation by and at the request of a licensed medical practitioner. 5.2. provide radiation therapy services as an essent ...
Evaluation of the Three Dimensional Localization
... accuracy which is required for precise target dose delivery and normal tissue sparing during the treatment. The invasive stereotactic frame-based localization system was the gold standard in SRS for many years based on its high reliability; however, the invasive nature has significant disadvantages ...
... accuracy which is required for precise target dose delivery and normal tissue sparing during the treatment. The invasive stereotactic frame-based localization system was the gold standard in SRS for many years based on its high reliability; however, the invasive nature has significant disadvantages ...
Sir Godfrey Newbold Hounsfield KT CBE. 28 August 1919
... X-ray tube and generator. With this in place of the -ray source, the scanning time was reduced to nine hours and it was possible to scan a coronal section of a brain specimen, although one that had been removed from the skull. The result was encouraging: grey and white matter could be distinguished ...
... X-ray tube and generator. With this in place of the -ray source, the scanning time was reduced to nine hours and it was possible to scan a coronal section of a brain specimen, although one that had been removed from the skull. The result was encouraging: grey and white matter could be distinguished ...
- Wiley Online Library
... devices such as computed tomography (CT) and magnetic resonance imaging (MRI) increased dramatically. These new digital imaging modalities not only greatly enhanced the diagnostic capabilities of the medical profession but also necessitated the intercommunication of diverse imaging devices such as w ...
... devices such as computed tomography (CT) and magnetic resonance imaging (MRI) increased dramatically. These new digital imaging modalities not only greatly enhanced the diagnostic capabilities of the medical profession but also necessitated the intercommunication of diverse imaging devices such as w ...
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.