European Journal of Medical Physics
... optimization instrument of the DRLs, assessed only for few procedures and mainly for IC, is rarely implemented and used. The ICRP is putting new efforts in redefining the methods to assess and use DRLs as a tool to limit non acceptable dose levels and helping in the optimization process. For staff ex ...
... optimization instrument of the DRLs, assessed only for few procedures and mainly for IC, is rarely implemented and used. The ICRP is putting new efforts in redefining the methods to assess and use DRLs as a tool to limit non acceptable dose levels and helping in the optimization process. For staff ex ...
A literature review of electronic portal imaging for
... either before or during treatment. Devices such as point detectors, film and gel have been widely reported. More detailed information about the various systems used for verification of IMRT can be found elsewhere, e.g. [6,7]. Like EPIDs, various matrix detectors have been produced for measuring ener ...
... either before or during treatment. Devices such as point detectors, film and gel have been widely reported. More detailed information about the various systems used for verification of IMRT can be found elsewhere, e.g. [6,7]. Like EPIDs, various matrix detectors have been produced for measuring ener ...
ABR “Exam of the Future” Sharpens Focus on Images
... (ASRT), respectively. The Image Wisely campaign launched at RSNA 2010 and initially focused on CT. From 2011 to 2012 the second phase was completed, targeting nuclear medicine. Planning for the third phase is under way, targeting radiography and fluoroscopy. More than 17,000 individuals have pledg ...
... (ASRT), respectively. The Image Wisely campaign launched at RSNA 2010 and initially focused on CT. From 2011 to 2012 the second phase was completed, targeting nuclear medicine. Planning for the third phase is under way, targeting radiography and fluoroscopy. More than 17,000 individuals have pledg ...
Three-Dimensional C-arm Cone-beam CT: Applications in the Interventional Suite
... only been applied in the interventional radiology clinic in recent years. The clinical emergence of C-arm cone-beam CT has lagged only a little behind that of flat-panel detector fluoroscopy systems, which, as early research has demonstrated, offer higher spatial resolution than conventional image i ...
... only been applied in the interventional radiology clinic in recent years. The clinical emergence of C-arm cone-beam CT has lagged only a little behind that of flat-panel detector fluoroscopy systems, which, as early research has demonstrated, offer higher spatial resolution than conventional image i ...
QA for helical tomotherapy: Report of the AAPM Task Group 148
... resembles that of a helical CT scanner. The beam is generated by a 6 MV linear accelerator that is mounted on a slip ring gantry. The beam passes through a primary collimator and is further collimated into a fan-beam shape by an adjustable jaw. For further collimation, a binary multileaf collimator ...
... resembles that of a helical CT scanner. The beam is generated by a 6 MV linear accelerator that is mounted on a slip ring gantry. The beam passes through a primary collimator and is further collimated into a fan-beam shape by an adjustable jaw. For further collimation, a binary multileaf collimator ...
DICOM Conformance Template
... Future Evolution - GE understands that the DICOM Standard will evolve to meet the user's growing requirements. GE is actively involved in the development of the DICOM Standard. DICOM will incorporate new features and technologies and GE may follow the evolution of the Standard. The GEHC protocol is ...
... Future Evolution - GE understands that the DICOM Standard will evolve to meet the user's growing requirements. GE is actively involved in the development of the DICOM Standard. DICOM will incorporate new features and technologies and GE may follow the evolution of the Standard. The GEHC protocol is ...
Criteria for Acceptability of Medical Radiological Equipment
... This report provides a compendium of criteria which radiological, nuclear medicine and radiotherapy equipment in normal use ought to be able to pass. The most common form of criterion is a “suspension level” for a measurement of a performance or safety parameter. Failure to meet a suspension level w ...
... This report provides a compendium of criteria which radiological, nuclear medicine and radiotherapy equipment in normal use ought to be able to pass. The most common form of criterion is a “suspension level” for a measurement of a performance or safety parameter. Failure to meet a suspension level w ...
DoseWatch Ver. 1.3, 1.4: Direction # DOC1203862
... Future Evolution - GE understands that the DICOM Standard will evolve to meet the user's growing requirements. GE is actively involved in the development of the DICOM Standard. DICOM will incorporate new features and technologies and GE may follow the evolution of the Standard. The GEHC protocol is ...
... Future Evolution - GE understands that the DICOM Standard will evolve to meet the user's growing requirements. GE is actively involved in the development of the DICOM Standard. DICOM will incorporate new features and technologies and GE may follow the evolution of the Standard. The GEHC protocol is ...
cone beam ct: non-dental applications
... CBCT 3D-cephalometric analysis Conventional lateral cephalograms were used for many years for ortho dontic assessment, treatment and follow-up. On these 2D projection images both the bony structures and the overlying soft tissues could be evaluated and measured prior to surgery or non-surgical orth ...
... CBCT 3D-cephalometric analysis Conventional lateral cephalograms were used for many years for ortho dontic assessment, treatment and follow-up. On these 2D projection images both the bony structures and the overlying soft tissues could be evaluated and measured prior to surgery or non-surgical orth ...
Manuscript published in IEEE Transactions on Medical Imaging, vol
... the discrete time point t (Fig. 3). In our application, the liver arteries move because of respiration. For our model, we define p0i the position of the 3D point pi in the world coordinate system at time t = 0 (starting position at 3DRA acquisition), and pti its position at time t. 3) Matrix A of st ...
... the discrete time point t (Fig. 3). In our application, the liver arteries move because of respiration. For our model, we define p0i the position of the 3D point pi in the world coordinate system at time t = 0 (starting position at 3DRA acquisition), and pti its position at time t. 3) Matrix A of st ...
Respiratory Motion Correction in Positron Emission Tomography
... of image quality introduced by respiratory motion in positron emission tomography (PET), so that diagnostic performance for lung cancer can be improved. Lung cancer is currently the most common cause of cancer death both in the UK and in the world. PET/CT, which is a combination of PET and CT, provi ...
... of image quality introduced by respiratory motion in positron emission tomography (PET), so that diagnostic performance for lung cancer can be improved. Lung cancer is currently the most common cause of cancer death both in the UK and in the world. PET/CT, which is a combination of PET and CT, provi ...
Optimization of image acquisition parameters in chest
... Although new CT technology and reconstruction algorithms have led to possibilities of reducing the resulting radiation dose to the patient from a CT examination [16], most clinical tasks still result in effective doses up to several mSv [7, 17-20], considerably higher than that for a CXR examination ...
... Although new CT technology and reconstruction algorithms have led to possibilities of reducing the resulting radiation dose to the patient from a CT examination [16], most clinical tasks still result in effective doses up to several mSv [7, 17-20], considerably higher than that for a CXR examination ...
Radiological Protection in Cone Beam Computed Tomography
... dealing specifically with this technology. The perception that CBCT involves lower doses was only true in initial applications. CBCT is now used widely by specialists who have little or no training in radiological protection. Advice on appropriate utilisation of CBCT needs to be made widely availabl ...
... dealing specifically with this technology. The perception that CBCT involves lower doses was only true in initial applications. CBCT is now used widely by specialists who have little or no training in radiological protection. Advice on appropriate utilisation of CBCT needs to be made widely availabl ...
Anniversary Paper: Development of x
... metrics based on information and detection theory such as noise-power spectrum 共NPS兲, noise equivalent quanta 共NEQ兲, and signal detectability were also developed and applied to evaluating CT image quality.26,27 Image artifacts also occupied an important body of early research. The deleterious effect ...
... metrics based on information and detection theory such as noise-power spectrum 共NPS兲, noise equivalent quanta 共NEQ兲, and signal detectability were also developed and applied to evaluating CT image quality.26,27 Image artifacts also occupied an important body of early research. The deleterious effect ...
X-ray-based attenuation correction for positron emission
... low-energy photons are preferentially absorbed when passing through matter (Eq. 2), the energy spectrum is shifted toward higher photon energies. This produces the well known beam-hardening effect, where thick or dense body regions transmit photons with a “hardened” spectrum (that is, having a large ...
... low-energy photons are preferentially absorbed when passing through matter (Eq. 2), the energy spectrum is shifted toward higher photon energies. This produces the well known beam-hardening effect, where thick or dense body regions transmit photons with a “hardened” spectrum (that is, having a large ...
Shading correction algorithm for improvement of cone beam CT
... Once deviations from the planned patient position have been observed using CBCT imaging it is important to be able to assess what consequence this has for the treatment in terms of the dose received by the target and organs at risk. Ideally the daily delivered dose distribution would be calculated b ...
... Once deviations from the planned patient position have been observed using CBCT imaging it is important to be able to assess what consequence this has for the treatment in terms of the dose received by the target and organs at risk. Ideally the daily delivered dose distribution would be calculated b ...
Public Summary Document - Word 93 KB
... CBCT is a method to acquire 3D images through the use of a rotating gantry to which an x-ay source and detector are fixed. In contrast to the fan shaped beams and multiple detectors used in multi-slice computed tomography (CT), CBCT uses a cone-shaped x-ray beam with a flat panel detector to acquire ...
... CBCT is a method to acquire 3D images through the use of a rotating gantry to which an x-ay source and detector are fixed. In contrast to the fan shaped beams and multiple detectors used in multi-slice computed tomography (CT), CBCT uses a cone-shaped x-ray beam with a flat panel detector to acquire ...
medical physics 2012/13
... access to the OLAT throughout their training. In addition, The Reference Guide for Healthcare Science Training and Education in England will be published in autumn 2012. This will contextualise the STP within the wider MSC programme. 9. All STP trainees will be registered with the NSHCS for the dura ...
... access to the OLAT throughout their training. In addition, The Reference Guide for Healthcare Science Training and Education in England will be published in autumn 2012. This will contextualise the STP within the wider MSC programme. 9. All STP trainees will be registered with the NSHCS for the dura ...
PDF, 1.2 MB
... A wireless image consultation system for radiological sub-specialist consultations based on a portable computer and a mobile phone with secure access to the hospital network was set up and tested. The transmitted images of 68 patients were acceptable for final diagnosis in 72% of the cases. The wire ...
... A wireless image consultation system for radiological sub-specialist consultations based on a portable computer and a mobile phone with secure access to the hospital network was set up and tested. The transmitted images of 68 patients were acceptable for final diagnosis in 72% of the cases. The wire ...
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.