jcas-2005-isracas-abstracts
... patients diagnosed with low-grade malignant tumors of the lower jaw were operated on using both the Image-Guided Implantology System (IGIS) and the LXS. In 62 of 63 ESS patients the surgical procedure was uneventful. One patient with an atelectatic maxillary sinus developed a minor complication of p ...
... patients diagnosed with low-grade malignant tumors of the lower jaw were operated on using both the Image-Guided Implantology System (IGIS) and the LXS. In 62 of 63 ESS patients the surgical procedure was uneventful. One patient with an atelectatic maxillary sinus developed a minor complication of p ...
Digital radiography detectors e A technical overview: Part 1
... After the X-ray exposure and the creation of the latent image, the SPS is scanned in a separate CR reader device. The readout is a process that follows exposure of the image plate and constitutes the second step of the CR imaging cycle. A red laser beam scans the photostimulable screen stimulating t ...
... After the X-ray exposure and the creation of the latent image, the SPS is scanned in a separate CR reader device. The readout is a process that follows exposure of the image plate and constitutes the second step of the CR imaging cycle. A red laser beam scans the photostimulable screen stimulating t ...
Simple methods to reduce patient dose in a
... modality that has recently become available on linear accelerators for radiotherapy patient position verification. It was the aim of the present study to implement simple strategies for reduction of the dose delivered in a commercial CBCT system. The dose delivered in a CBCT procedure (Varian, half- ...
... modality that has recently become available on linear accelerators for radiotherapy patient position verification. It was the aim of the present study to implement simple strategies for reduction of the dose delivered in a commercial CBCT system. The dose delivered in a CBCT procedure (Varian, half- ...
Equipment Specifications
... - A reader with system features high-quality image plate processing, a high-speed cassette-feeder and unique configuration flexibility: from multi-reader, multi-terminal configurations to high-speed network communication. It must have preview capability, throughput of at least 80 cassettes/hour, for ...
... - A reader with system features high-quality image plate processing, a high-speed cassette-feeder and unique configuration flexibility: from multi-reader, multi-terminal configurations to high-speed network communication. It must have preview capability, throughput of at least 80 cassettes/hour, for ...
comparison of teflon phantom image from pet/ct scanner and monte
... Applications of Monte Carlo techniques in the field of radiological imaging include performance assessment and optimisation of design geometries and scanning parameters (Ay and Zaidi, 2005). The general idea of MCNP analysis is to create a model which is more or less similar to the real system under ...
... Applications of Monte Carlo techniques in the field of radiological imaging include performance assessment and optimisation of design geometries and scanning parameters (Ay and Zaidi, 2005). The general idea of MCNP analysis is to create a model which is more or less similar to the real system under ...
Prime Factors
... • The sum of the components in a recording system cannot be greater than the system as a whole. • When any component’s function is compromised because of some type of interference, the overall quality of the system is affected. ...
... • The sum of the components in a recording system cannot be greater than the system as a whole. • When any component’s function is compromised because of some type of interference, the overall quality of the system is affected. ...
Body Imaging
... learned. Proper post-processing of imaging data is a central part of the rotation. The remaining 18 months shall be spent as follows: a) Adult fluoroscopy (four weeks): The fellow will consolidate his/her fluoroscopic skills; including being exposed to a variety of less traditional examinations of t ...
... learned. Proper post-processing of imaging data is a central part of the rotation. The remaining 18 months shall be spent as follows: a) Adult fluoroscopy (four weeks): The fellow will consolidate his/her fluoroscopic skills; including being exposed to a variety of less traditional examinations of t ...
slides - Vanderbilt HEP
... pass through most stuff. X-rays also pass through most things, but for the opposite reason: They have too much energy. They can, however, knock an electron away from an atom altogether. Some of the energy from the X-ray photon works to separate the electron from the atom, and the rest sends the el ...
... pass through most stuff. X-rays also pass through most things, but for the opposite reason: They have too much energy. They can, however, knock an electron away from an atom altogether. Some of the energy from the X-ray photon works to separate the electron from the atom, and the rest sends the el ...
CT2 - hullrad Radiation Physics
... – No detector is 100% efficient at converting photon into signal – Modern scanner have 90% efficiencies or above Noise reduction algorithms – Smooth noise without reducing fine detail ...
... – No detector is 100% efficient at converting photon into signal – Modern scanner have 90% efficiencies or above Noise reduction algorithms – Smooth noise without reducing fine detail ...
RAD 216 ADVANCED IMAGING MODALITIES
... scanner directs a fine stream of electrons to a set of target rings in the gantry. The electron-target collision produces several x-ray beams which pass through the patient. There are no moving parts other than the table. ...
... scanner directs a fine stream of electrons to a set of target rings in the gantry. The electron-target collision produces several x-ray beams which pass through the patient. There are no moving parts other than the table. ...
Frequently Asked Questions
... The MRI scan time is dependent on the exact area of the body that is under investigation. The majority of MRI procedures range from twenty minutes to forty-five minutes. Occasionally, more complex scans may take up to sixty minutes. If the ordering physician asks for an MRI of more than one body par ...
... The MRI scan time is dependent on the exact area of the body that is under investigation. The majority of MRI procedures range from twenty minutes to forty-five minutes. Occasionally, more complex scans may take up to sixty minutes. If the ordering physician asks for an MRI of more than one body par ...
Distributed source x-ray tube technology for
... Interest in tomosynthesis imaging has increased in recent years to offer an imaging modality between the threedimensional resolution of CT and the two-dimensional resolution of single projections. Advantages are the good in-plane resolution and the 3D depth information, with dose levels comparable t ...
... Interest in tomosynthesis imaging has increased in recent years to offer an imaging modality between the threedimensional resolution of CT and the two-dimensional resolution of single projections. Advantages are the good in-plane resolution and the 3D depth information, with dose levels comparable t ...
Diagnostic Radiology Residents Physics Curriculum 2009
... 1. Calculate the statistical significance of a measurement or a combination of measurements. 2. Determine how changes in each image processing procedure impact the final image produced. Evaluate how these changes affect the image of different objects or body parts and their associated views. 3. You ...
... 1. Calculate the statistical significance of a measurement or a combination of measurements. 2. Determine how changes in each image processing procedure impact the final image produced. Evaluate how these changes affect the image of different objects or body parts and their associated views. 3. You ...
Treatment Quality Assurance for Linac Based SRS/SBRT
... Recommendation for Patient Positioning, Immobilization, Localization and Delivery • For SBRT, image-guided localization techniques shall be used to guarantee the spatial accuracy of the delivered dose distribution with a high confidence level. • Body frames and associated fiducial systems may be us ...
... Recommendation for Patient Positioning, Immobilization, Localization and Delivery • For SBRT, image-guided localization techniques shall be used to guarantee the spatial accuracy of the delivered dose distribution with a high confidence level. • Body frames and associated fiducial systems may be us ...
Introduction to Radiology - UNC School of Medicine
... every 3 months or so. Abscess drains usually need a sinogram (tube injection) to evaluate the cavity size and for any fistulous connections, about 2 weeks after placement. ...
... every 3 months or so. Abscess drains usually need a sinogram (tube injection) to evaluate the cavity size and for any fistulous connections, about 2 weeks after placement. ...
Document
... Computed tomography (CT) was commercially introduced into radiology in 1972 and was the first fully digital imaging device making it truly revolutionary in diagnostic imaging. In 1979, Godfrey Hounsfield and Allen Cormack were awarded the Nobel Prize in Physiology and Medicine for their contribution ...
... Computed tomography (CT) was commercially introduced into radiology in 1972 and was the first fully digital imaging device making it truly revolutionary in diagnostic imaging. In 1979, Godfrey Hounsfield and Allen Cormack were awarded the Nobel Prize in Physiology and Medicine for their contribution ...
Annals of the ICRP
... Many workers have shown the disproportionate radiation burden to the community from CT compared with the relatively low number of procedures performed. And this is particularly true in paediatric practice. Thus every time a child or young or pregnant patient is referred, one should think about wheth ...
... Many workers have shown the disproportionate radiation burden to the community from CT compared with the relatively low number of procedures performed. And this is particularly true in paediatric practice. Thus every time a child or young or pregnant patient is referred, one should think about wheth ...
Artefacts in cone beam CT - Scientific Research Publishing
... a high energy X-ray photon and one of the outer shell electrons of an atom. This outer shell electron is bound with very little energy to the atom so when the X-ray photon collides with it, the electron is ejected from the atom. Because energy and momentum are both conserved in this collision, the e ...
... a high energy X-ray photon and one of the outer shell electrons of an atom. This outer shell electron is bound with very little energy to the atom so when the X-ray photon collides with it, the electron is ejected from the atom. Because energy and momentum are both conserved in this collision, the e ...
absorbing X-ray photons
... pass through most stuff. X-rays also pass through most things, but for the opposite reason: They have too much energy. They can, however, knock an electron away from an atom altogether. Some of the energy from the X-ray photon works to separate the electron from the atom, and the rest sends the el ...
... pass through most stuff. X-rays also pass through most things, but for the opposite reason: They have too much energy. They can, however, knock an electron away from an atom altogether. Some of the energy from the X-ray photon works to separate the electron from the atom, and the rest sends the el ...
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.