Reducing Dose for Digital Cranial Radiography
... 3.8 years). All radiographs were assessed using relative visual grading analysis (VGA) with a four-point scoring scale [29–31] as shown in Table 1. The inclusion of radiographers in this study was considered suitable because the observers were only required to assess the visibility of key anatomic l ...
... 3.8 years). All radiographs were assessed using relative visual grading analysis (VGA) with a four-point scoring scale [29–31] as shown in Table 1. The inclusion of radiographers in this study was considered suitable because the observers were only required to assess the visibility of key anatomic l ...
Adult patient doses in interventional neuroradiology
... area was continually exposed to the x-ray beam. During interventional neuroradiologic procedures, a 20° to 30° rotation of the x-ray source in the sagittal plane of the patient may be used when acquiring radiographic images. Although the central axis of the x-ray beam changes position on the surface ...
... area was continually exposed to the x-ray beam. During interventional neuroradiologic procedures, a 20° to 30° rotation of the x-ray source in the sagittal plane of the patient may be used when acquiring radiographic images. Although the central axis of the x-ray beam changes position on the surface ...
DIAGNOSTIC IMAGING 1 – 1/08/08 Osteopenia: Low Bone Density
... Contrast (Image): # of Shades of Black and White. The highest contrast has 2 shades of gray (also known as -white and black). In the lung fields, we benefit from many shades of gray. A). Bone film = we like high contrast (black and white only). B). In a chest film/GI film = we benefit from lower con ...
... Contrast (Image): # of Shades of Black and White. The highest contrast has 2 shades of gray (also known as -white and black). In the lung fields, we benefit from many shades of gray. A). Bone film = we like high contrast (black and white only). B). In a chest film/GI film = we benefit from lower con ...
Introducing Radiology Select: Radiation Dose and Dose Reduction
... dose management. The aim of this edition of Radiology Select was, therefore, to collect the best articles published in Radiology from 2008 to mid-2013 that address these important and rapidly evolving issues. We reviewed articles with the general topic of radiation dose, defined major categories for ...
... dose management. The aim of this edition of Radiology Select was, therefore, to collect the best articles published in Radiology from 2008 to mid-2013 that address these important and rapidly evolving issues. We reviewed articles with the general topic of radiation dose, defined major categories for ...
Conceptual Amendment to SB 219 General 1
... room with the person being supervised or an adjacent room and immediately available to furnish assistance and direction. “Personal supervision” means supervision where the person providing supervision is present in the room with the person being supervised. “Radiation therapy” means the administrati ...
... room with the person being supervised or an adjacent room and immediately available to furnish assistance and direction. “Personal supervision” means supervision where the person providing supervision is present in the room with the person being supervised. “Radiation therapy” means the administrati ...
Image-guided radiation therapy (IGRT): practical
... Cone beam computed tomography (CBCT) is the most widespread three-dimensional IGRT system. It utilizes an X-ray tube source. The X-ray source and a flat panel detector are mounted on the gantry of the linear accelerator; it is not only possible to acquire planar images, but also multiple projections ...
... Cone beam computed tomography (CBCT) is the most widespread three-dimensional IGRT system. It utilizes an X-ray tube source. The X-ray source and a flat panel detector are mounted on the gantry of the linear accelerator; it is not only possible to acquire planar images, but also multiple projections ...
Detector technology in simultaneous spectral
... components of the NanoPanel Prism detector electronics design. The ASIC is used in a unique concept for analogto-digital conversion of the signals with very low power dissipation and yet low noise (both wideband and low frequency noise). The ASIC is mounted closely to the FIP for better layout, shor ...
... components of the NanoPanel Prism detector electronics design. The ASIC is used in a unique concept for analogto-digital conversion of the signals with very low power dissipation and yet low noise (both wideband and low frequency noise). The ASIC is mounted closely to the FIP for better layout, shor ...
National Diagnostic Reference Levels Factsheet
... assurance tool), they are advisory and NOT a dose limit, therefore should not be applied to individual patients. The application of a FRL is for the local imaging facility to establish a reference dose for their common imaging protocols that can be used for internal and external comparison. DRLs can ...
... assurance tool), they are advisory and NOT a dose limit, therefore should not be applied to individual patients. The application of a FRL is for the local imaging facility to establish a reference dose for their common imaging protocols that can be used for internal and external comparison. DRLs can ...
CT Accreditation Program: Image Quality and Dose
... The Physics Subcommittee met in March of 1999 for a “Scan-a-thon,” where we discussed and scanned all then-current commercial (and several “home-made”) CT image quality phantoms, in attempt to determine if any existing phantom met the needs of the program. We attempted to find a method by which diff ...
... The Physics Subcommittee met in March of 1999 for a “Scan-a-thon,” where we discussed and scanned all then-current commercial (and several “home-made”) CT image quality phantoms, in attempt to determine if any existing phantom met the needs of the program. We attempted to find a method by which diff ...
Uterine Artery Embolization: Optimization with Preprocedural
... imaging). The two reviewers performed all the 3D reconstructions together in consensus and used the 3D model for their assessment. The uterine artery with its characteristic tortuous course was identified and traced backward to its origin, where the 3D-reconstructed figure of the pelvic arterial tre ...
... imaging). The two reviewers performed all the 3D reconstructions together in consensus and used the 3D model for their assessment. The uterine artery with its characteristic tortuous course was identified and traced backward to its origin, where the 3D-reconstructed figure of the pelvic arterial tre ...
171.pdf
... Contrast enhanced magnetic resonance (CE-MR) mammography imaging is an emerging imaging technique for the detection and diagnosis of breast cancer. It requires the acquisition of a 3D MR scan prior to the injection of a contrast agent like Gadolinium DTPA, followed by a dynamic sequence of 3D MR sca ...
... Contrast enhanced magnetic resonance (CE-MR) mammography imaging is an emerging imaging technique for the detection and diagnosis of breast cancer. It requires the acquisition of a 3D MR scan prior to the injection of a contrast agent like Gadolinium DTPA, followed by a dynamic sequence of 3D MR sca ...
MAESTRO Deliverable N° D8 : Report on the development of a
... image enhancement too. However, the difference between these two techniques is that the image enhancement uses subjective criteria to improve the appearance of the image, while image restoration tries to reverse specific damage to the image using objective criteria [80]. There are two reasons why an i ...
... image enhancement too. However, the difference between these two techniques is that the image enhancement uses subjective criteria to improve the appearance of the image, while image restoration tries to reverse specific damage to the image using objective criteria [80]. There are two reasons why an i ...
Image quality vs radiation dose of four cone beam computed
... The results of the analysis of the segmentation accuracy can be found in Table 2. The highest accuracy for the segmentation of the mandible was found for the i-CAT (protocols I2 and I3), this accuracy was also higher than for the Somatom Sensation 16. The lowest accuracy was found for the MercuRay. ...
... The results of the analysis of the segmentation accuracy can be found in Table 2. The highest accuracy for the segmentation of the mandible was found for the i-CAT (protocols I2 and I3), this accuracy was also higher than for the Somatom Sensation 16. The lowest accuracy was found for the MercuRay. ...
comparison of image quality test methods in computed
... information on the perceptibility of details of different size, although it does provide data on how well objects of different attenuation can be imaged, the question is if that method is good enough for evaluation and maintenance of an adequate image quality. In the present work comparison of the s ...
... information on the perceptibility of details of different size, although it does provide data on how well objects of different attenuation can be imaged, the question is if that method is good enough for evaluation and maintenance of an adequate image quality. In the present work comparison of the s ...
example from X-ray Diagnostic Radiology
... to specific Regulations. This might reflect in a superficial attitude to the QC tests linked mainly to “bureaucratic” collection of QC records. ...
... to specific Regulations. This might reflect in a superficial attitude to the QC tests linked mainly to “bureaucratic” collection of QC records. ...
Medical Physics: Some Recollections in Diagnostic X
... In 1895, Wilhelm Conrad Roentgen surprised the world with a revolutionary discovery that gave birth to the professions of diagnostic and therapeutic medical physics. Since then, physicists have worked avidly to develop new discoveries to advance the technology of medical imaging and radiation therap ...
... In 1895, Wilhelm Conrad Roentgen surprised the world with a revolutionary discovery that gave birth to the professions of diagnostic and therapeutic medical physics. Since then, physicists have worked avidly to develop new discoveries to advance the technology of medical imaging and radiation therap ...
Image artifact in dental cone
... Van Daatselaar et al.7 reported that in an experimental limited-volume CBCT imaging study of a dried mandible using a charge-coupled device (CCD) x-ray detector, a ‘‘bright band artifact’’ was observed in the edges of imaging area. They mentioned that this bright band artifact was caused by the plac ...
... Van Daatselaar et al.7 reported that in an experimental limited-volume CBCT imaging study of a dried mandible using a charge-coupled device (CCD) x-ray detector, a ‘‘bright band artifact’’ was observed in the edges of imaging area. They mentioned that this bright band artifact was caused by the plac ...
Considerations Regarding Radiation Exposure in
... the referring physician in order to avoid unnecessary repeated exposure. Risk-benefit ratios of whole body PETCT must be carefully evaluated before each study is ordered. This is especially important in cases where the clinical utility is less well established, in addition to the younger patient pop ...
... the referring physician in order to avoid unnecessary repeated exposure. Risk-benefit ratios of whole body PETCT must be carefully evaluated before each study is ordered. This is especially important in cases where the clinical utility is less well established, in addition to the younger patient pop ...
What is Cone-Beam CT and How Does it Work? ,
... to conventional CT using either fan-beam or spiral-scan geometries, to provide more rapid acquisition of a data set of the entire FOV and it uses a comparatively less expensive radiation detector. Obvious advantages of such a system, which provides a shorter examination time, include the reduction o ...
... to conventional CT using either fan-beam or spiral-scan geometries, to provide more rapid acquisition of a data set of the entire FOV and it uses a comparatively less expensive radiation detector. Obvious advantages of such a system, which provides a shorter examination time, include the reduction o ...
ACR-SPR Practice Parameter for the Performance of Computed
... during free breathing for certain indications, such as radiation therapy planning. B. The primary goal of CT scanning is to obtain diagnostic information from images of sufficient quality from the task. Protocols should be optimized to give the lowest dose required to achieve appropriate image quali ...
... during free breathing for certain indications, such as radiation therapy planning. B. The primary goal of CT scanning is to obtain diagnostic information from images of sufficient quality from the task. Protocols should be optimized to give the lowest dose required to achieve appropriate image quali ...
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.