Optimisation of radiation dose and image quality for AP pelvis
... 5.2.2.3. Optimisation strategies in digital radiography (CR & DR) ................................ 106 5.2.3. Computed radiography-detector (physical overview) ............................................... 111 5.2.4. Radiographic acquisition factors (Technological and Operational) ................ ...
... 5.2.2.3. Optimisation strategies in digital radiography (CR & DR) ................................ 106 5.2.3. Computed radiography-detector (physical overview) ............................................... 111 5.2.4. Radiographic acquisition factors (Technological and Operational) ................ ...
Reduction of CT dose for CT-based PET attenuation correction
... proposed for accurate CT based PET attenuation correction (CTAC) for bone imaging. However, for both methods, the radiation dose from the CT scan is unacceptably high with the current CT techniques. This directly limits the clinical application of the quantitative PET imaging. ...
... proposed for accurate CT based PET attenuation correction (CTAC) for bone imaging. However, for both methods, the radiation dose from the CT scan is unacceptably high with the current CT techniques. This directly limits the clinical application of the quantitative PET imaging. ...
optimisation and establishment of diagnostic
... The development of this thesis would not have been possible without the help of several friends that followed me from the first minute. To all of them my sincere thank you, for sharing outstanding moments and helping me to remove the stones from a long and winding road. To Profess ...
... The development of this thesis would not have been possible without the help of several friends that followed me from the first minute. To all of them my sincere thank you, for sharing outstanding moments and helping me to remove the stones from a long and winding road. To Profess ...
MIRD Pamphlet No. 23: Quantitative SPECT for Patient
... report radiobiologic quantities that account for the biologic consequences of both spatial and temporal nonuniformities in these dose estimates. This report presents an overview of 3-dimensional SPECT methods and requirements for internal dosimetry at both regional and voxel levels. Combined SPECT/C ...
... report radiobiologic quantities that account for the biologic consequences of both spatial and temporal nonuniformities in these dose estimates. This report presents an overview of 3-dimensional SPECT methods and requirements for internal dosimetry at both regional and voxel levels. Combined SPECT/C ...
Novel Techniques for Integrating Video Augmented X
... The standard mobile C-arm fluoroscope, found in nearly every hospital worldwide, is the primary technology used in guiding orthopedic and trauma surgeries. It produces a realtime X-ray image that provides surgeons with live visual information of the anatomy to be treated. However, there are several ...
... The standard mobile C-arm fluoroscope, found in nearly every hospital worldwide, is the primary technology used in guiding orthopedic and trauma surgeries. It produces a realtime X-ray image that provides surgeons with live visual information of the anatomy to be treated. However, there are several ...
Slides to IAEA Diagnostic Radiology Physics: A Handbook for
... This means, for example, that we can calculate the average fluence of an X ray beam either by averaging over a Region or averaging over Multiple Images When an appropriate imaging system is used to image an ergodic process (such as a uniform scene imaged with X rays), calculations performed from a n ...
... This means, for example, that we can calculate the average fluence of an X ray beam either by averaging over a Region or averaging over Multiple Images When an appropriate imaging system is used to image an ergodic process (such as a uniform scene imaged with X rays), calculations performed from a n ...
Quantification in fluorine-18-fluorodeoxyglucose dedicated breast
... Accuracy of affine registration between the PET and CT as a function of detector height. Error bars represent the range. . . . . . . Accuracy of affine registration between the PET and CT as a function of reposition number. Error bars represent the range. . . . . Influence of PET electronics and act ...
... Accuracy of affine registration between the PET and CT as a function of detector height. Error bars represent the range. . . . . . . Accuracy of affine registration between the PET and CT as a function of reposition number. Error bars represent the range. . . . . Influence of PET electronics and act ...
evaluation of a diffraction-enhanced imaging (dei)
... (Under the direction of Etta Pisano) Conventional mammographic image contrast is derived from x-ray absorption, resulting in breast structure visualization due to density gradients that attenuate radiation without distinction between transmitted, scattered, or refracted x-rays. Diffractionenhanced i ...
... (Under the direction of Etta Pisano) Conventional mammographic image contrast is derived from x-ray absorption, resulting in breast structure visualization due to density gradients that attenuate radiation without distinction between transmitted, scattered, or refracted x-rays. Diffractionenhanced i ...
Tomotherapy vs IMRT (952kB PPT)
... tomotherapy, are inherently much more reliable since the sensors need to read only in open or closed ...
... tomotherapy, are inherently much more reliable since the sensors need to read only in open or closed ...
Reducing Radiation Dose to the Female Breast During
... reduced breast dose by 85%, 81%, 18%, and 6%, respectively, while the shielded protocol increased breast dose by 68%. Results for the small-diameter/high-contrast signal followed similar trends, but with smaller magnitude of the percent changes in dose. The 80 kV protocols demonstrated the greatest ...
... reduced breast dose by 85%, 81%, 18%, and 6%, respectively, while the shielded protocol increased breast dose by 68%. Results for the small-diameter/high-contrast signal followed similar trends, but with smaller magnitude of the percent changes in dose. The 80 kV protocols demonstrated the greatest ...
Honored Lecture 2012 du RSNA congrès
... female radiology residents since 2003, according to a recent survey. The total number of residents increased 29 percent during that time. Read more on Page 20. ...
... female radiology residents since 2003, according to a recent survey. The total number of residents increased 29 percent during that time. Read more on Page 20. ...
diagnostic imaging in the community
... It may seem easy for patients in a suburb of a big city to go to a large central hospital. However, there is often difficulty in transport and ambulances are needed, both to take the patient for the examination and to bring them back to their own doctor and home. Equally important, if all patients f ...
... It may seem easy for patients in a suburb of a big city to go to a large central hospital. However, there is often difficulty in transport and ambulances are needed, both to take the patient for the examination and to bring them back to their own doctor and home. Equally important, if all patients f ...
image guided radiation therapy applications for
... neck region are circumvented with ultrasound imaging, and after dosimetric verification it is argued that adaptive replanning may be more beneficial than patient realignment when intensity modulated radiation therapy techniques are used. Some of the largest dose delivery errors were found in externa ...
... neck region are circumvented with ultrasound imaging, and after dosimetric verification it is argued that adaptive replanning may be more beneficial than patient realignment when intensity modulated radiation therapy techniques are used. Some of the largest dose delivery errors were found in externa ...
Axially Extended-Volume C-Arm CT Using a Reverse Helical
... because it is difficult to perform a single scan that simultaneously provides information for trajectory calibration and tomographic data of the patient. C-arm CT usually performs trajectory calibration once and uses the calibrated trajectory in subsequent tomographic scans. Fourth, there is the iss ...
... because it is difficult to perform a single scan that simultaneously provides information for trajectory calibration and tomographic data of the patient. C-arm CT usually performs trajectory calibration once and uses the calibrated trajectory in subsequent tomographic scans. Fourth, there is the iss ...
Image Quality and Dose Evaluation of Filtered Back Projection
... 1.8 A representation of first generation CT scanner (Parallel Beam, Translate-Rotate). . 1.9 A representation of second generation CT scanner (Fan Beam, Translate-Rotate). . . 1.10 A representation of third generation CT scanner (Fan Beam, Rotate only). . . . . . 1.11 A representation of fourth gene ...
... 1.8 A representation of first generation CT scanner (Parallel Beam, Translate-Rotate). . 1.9 A representation of second generation CT scanner (Fan Beam, Translate-Rotate). . . 1.10 A representation of third generation CT scanner (Fan Beam, Rotate only). . . . . . 1.11 A representation of fourth gene ...
New dimensions in endodontic imaging: Part 2. Cone beam
... into a format that closely resembles that produced by medical CT scanners (Figs 3 and 4). Each mini-exposure or projection image generates a pixel matrix consisting of 262 144 (512 · 512) pixels. The result- ...
... into a format that closely resembles that produced by medical CT scanners (Figs 3 and 4). Each mini-exposure or projection image generates a pixel matrix consisting of 262 144 (512 · 512) pixels. The result- ...
Delivery accuracy of image guided radiation therapy using Elekta
... highlighted in red. ..............................................................................................................21 Figure 2.6: Isodose plot of the treatment plan in the coronal orientation. The PTV is highlighted in red. ............................................................. ...
... highlighted in red. ..............................................................................................................21 Figure 2.6: Isodose plot of the treatment plan in the coronal orientation. The PTV is highlighted in red. ............................................................. ...
Calculation, verification and monitoring of patient dose in Diagnostic
... Routine Coronary Angiography is a relatively high dose diagnostic procedure. The results from a diagnostic procedure may indicate the need for an interventional examination, which has the potential for even higher patient dose. Doses for these procedures are monitored via an integrated dose area pro ...
... Routine Coronary Angiography is a relatively high dose diagnostic procedure. The results from a diagnostic procedure may indicate the need for an interventional examination, which has the potential for even higher patient dose. Doses for these procedures are monitored via an integrated dose area pro ...
Automatic Calculation of the Arterial Input Function for Cerebral
... assessed by a neuroradiologist. In each case, conventional images were available for interpretation or comparison in the event that the automatically processed images were considered technically inadequate. In all cases, commercially available software was also available to evaluate time courses fro ...
... assessed by a neuroradiologist. In each case, conventional images were available for interpretation or comparison in the event that the automatically processed images were considered technically inadequate. In all cases, commercially available software was also available to evaluate time courses fro ...
Lung Nodule Volume Assessment and - QIBA Wiki
... X-ray computed tomography provides an effective means of detecting and monitoring pulmonary nodules, and can lead to increased survival (1) and reduced mortality (2) in individuals at high risk for lung cancer. Size quantification on serial imaging is helpful in evaluating whether a pulmonary nodule ...
... X-ray computed tomography provides an effective means of detecting and monitoring pulmonary nodules, and can lead to increased survival (1) and reduced mortality (2) in individuals at high risk for lung cancer. Size quantification on serial imaging is helpful in evaluating whether a pulmonary nodule ...
Diagnostic Reference Levels in Medical Imaging
... The measurement of quantities related to patient dose for optimisation of protection in medical imaging with ionising radiation began more than half a century ago. Beginning in the 1950s, national surveys of such quantities for diagnostic x-ray examinations were performed in the United States and th ...
... The measurement of quantities related to patient dose for optimisation of protection in medical imaging with ionising radiation began more than half a century ago. Beginning in the 1950s, national surveys of such quantities for diagnostic x-ray examinations were performed in the United States and th ...
3D Medical Image Reconstruction - Estudo Geral
... asymptomatic at earlier stages, but it has a high survival rate at the earliest stages. These characteristics make the screening and the accurate diagnostic important issues. With the aim of reduce the damage caused by breast diseases, new image techniques have arisen and the current techniques are ...
... asymptomatic at earlier stages, but it has a high survival rate at the earliest stages. These characteristics make the screening and the accurate diagnostic important issues. With the aim of reduce the damage caused by breast diseases, new image techniques have arisen and the current techniques are ...
PDF - Journal of Advanced Medical and Dental Sciences
... CBCT is a reliable tool in the assessment of the proximity to vital structures that may interfere with orthodontic treatment. Orthodontists can use CBCT images in orthodontic assessment and cephalometric analysis. Today, CBCT is already the tool of choice in the assessment of facial growth, age, air ...
... CBCT is a reliable tool in the assessment of the proximity to vital structures that may interfere with orthodontic treatment. Orthodontists can use CBCT images in orthodontic assessment and cephalometric analysis. Today, CBCT is already the tool of choice in the assessment of facial growth, age, air ...
Cone-Beam Computed Tomography Examinations of
... increases with dose [66, p. 45]. Deterministic effects are associated with high single radiation doses [66, p. 44] and are thus not common in diagnostic radiology [98]. For stochastic effects, the total risk is determined by the cumulative dose of lifetime exposures to ionising radiation. For an ind ...
... increases with dose [66, p. 45]. Deterministic effects are associated with high single radiation doses [66, p. 44] and are thus not common in diagnostic radiology [98]. For stochastic effects, the total risk is determined by the cumulative dose of lifetime exposures to ionising radiation. For an ind ...
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.