A Guide to CT Radiation Dose Management
... Introduced in the early 1970s, computed tomography (CT) has become an invaluable diagnostic tool. Today, approximately 81 million CT scans are performed annually in the United States alone.1 ...
... Introduced in the early 1970s, computed tomography (CT) has become an invaluable diagnostic tool. Today, approximately 81 million CT scans are performed annually in the United States alone.1 ...
Managing Patient Dose in Multi-Detector Computed Tomography
... acquired using MDCT systems with less than 16 active detector rows. There are indications that awareness on adapting exposure factors to manage patient dose is increasing but the rate at which technology is changing overtakes adoption of effective ...
... acquired using MDCT systems with less than 16 active detector rows. There are indications that awareness on adapting exposure factors to manage patient dose is increasing but the rate at which technology is changing overtakes adoption of effective ...
Diagnostic Imaging Vol 2 - PACS and specialist imaging
... However, the information provided in this section may be relevant to the design of such facilities. 1.3 Dental radiography (excluding dental CT examinations) makes up approximately 25% of the examinations undertaken in the UK annually. It is also one of the largest groups of examinations performed, ...
... However, the information provided in this section may be relevant to the design of such facilities. 1.3 Dental radiography (excluding dental CT examinations) makes up approximately 25% of the examinations undertaken in the UK annually. It is also one of the largest groups of examinations performed, ...
Chapter 4732 X-ray Definitions: Proposed Revisions to 4732.0110
... airline, railroad, and bus terminals and in similar facilities. An x-ray tube used within a shielded part of a building or x-ray equipment that may temporarily or occasionally incorporate portable shielding is not considered a cabinet x-ray system. Subp. 25. Calibration. "Calibration" means: a deter ...
... airline, railroad, and bus terminals and in similar facilities. An x-ray tube used within a shielded part of a building or x-ray equipment that may temporarily or occasionally incorporate portable shielding is not considered a cabinet x-ray system. Subp. 25. Calibration. "Calibration" means: a deter ...
Dose and image quality for a cone-beam C-arm
... metric as the logical analogue to conventional CT doses and also demonstrated a measurement technique using a conventional ion chamber.15 Dixon has previously suggested the use of a small ion chamber to obtain a direct measurement of the accumulated dose in the central scan plane resulting from a he ...
... metric as the logical analogue to conventional CT doses and also demonstrated a measurement technique using a conventional ion chamber.15 Dixon has previously suggested the use of a small ion chamber to obtain a direct measurement of the accumulated dose in the central scan plane resulting from a he ...
Principles and Practice of PET/CT
... authors, who have ensured the educational value and quality of this guide. Special thanks are extended to the editors, Professor Peter Hogg and Mr. Giorgio Testanera, for their dedication to the success of this publication. In particular, many thanks are due to Siemens Medical for their support and ...
... authors, who have ensured the educational value and quality of this guide. Special thanks are extended to the editors, Professor Peter Hogg and Mr. Giorgio Testanera, for their dedication to the success of this publication. In particular, many thanks are due to Siemens Medical for their support and ...
Principles and Practice of PET/CT
... be conducted to ensure optimal performance. Given that PET-CT radiation protection requirements are complex, we have included a substantial chapter on this. This comprises three elements – ‘staff’, ‘patient’ and ‘department design’. There is also a chapter on patient care, and, as with radiation pro ...
... be conducted to ensure optimal performance. Given that PET-CT radiation protection requirements are complex, we have included a substantial chapter on this. This comprises three elements – ‘staff’, ‘patient’ and ‘department design’. There is also a chapter on patient care, and, as with radiation pro ...
PACS Specification - UK Imaging Informatics Group
... SSO, DTI etc). A verified report on PACS prevents needs of verbal reports documented on paper notes, and mis-understandings, and thus improving patient care & safety. In the future we will see some radiologists requesting for part working from home. Technology needs to support this. a. access to any ...
... SSO, DTI etc). A verified report on PACS prevents needs of verbal reports documented on paper notes, and mis-understandings, and thus improving patient care & safety. In the future we will see some radiologists requesting for part working from home. Technology needs to support this. a. access to any ...
Single Photon Emission Computed Tomography
... light is much more focused than in an Anger camera and can be detected by a photodiode array instead of conventional PMTs, thereby making the detector much more compact. A possible concern for pixelated detectors is that their less efficient light collection may degrade energy resolution. Pixelated ...
... light is much more focused than in an Anger camera and can be detected by a photodiode array instead of conventional PMTs, thereby making the detector much more compact. A possible concern for pixelated detectors is that their less efficient light collection may degrade energy resolution. Pixelated ...
The Evolution of Stereotactic Radiosurgery
... High dose of “ablative” radiation delivered to a target localized in 3-dimensions with overall end to end precision on the order of 1-2 mm delivered over 1-5 treatments ...
... High dose of “ablative” radiation delivered to a target localized in 3-dimensions with overall end to end precision on the order of 1-2 mm delivered over 1-5 treatments ...
Diagnostic X-Ray QA/QC
... The Integrator II, which 1 year later (1984) became known as the base of our QUART dido Series, was the first PTB* approved diagnostic meter of its kind. 1988 QUART dido/time | QUART RöVi Some time after its launch, the RöVi/time was further developed to become the first sandwich/double dosimeter t ...
... The Integrator II, which 1 year later (1984) became known as the base of our QUART dido Series, was the first PTB* approved diagnostic meter of its kind. 1988 QUART dido/time | QUART RöVi Some time after its launch, the RöVi/time was further developed to become the first sandwich/double dosimeter t ...
Dental CBCT performance testing for physicists and technologists
... Manchester University Hospitals NHS Foundation Trust, Manchester, UK. The use of cone beam CT (CBCT) in dentistry has grown rapidly and this trend is likely to continue as old panoramic X-ray systems are replaced. CBCT radiation doses are at least an order of magnitude higher than those of the conve ...
... Manchester University Hospitals NHS Foundation Trust, Manchester, UK. The use of cone beam CT (CBCT) in dentistry has grown rapidly and this trend is likely to continue as old panoramic X-ray systems are replaced. CBCT radiation doses are at least an order of magnitude higher than those of the conve ...
anti scatter grid
... Contrast: capability of the system to make visible small differences in soft tissue density Sharpness: capability of the system to make visible small details (calcifications down to 0.1 mm) Dose: the female breast is a very radiosensitive organ and there is a risk of carcinogenesis associated with t ...
... Contrast: capability of the system to make visible small differences in soft tissue density Sharpness: capability of the system to make visible small details (calcifications down to 0.1 mm) Dose: the female breast is a very radiosensitive organ and there is a risk of carcinogenesis associated with t ...
Conference of Radiation Control Program Directors (CRCPD) Suggested State Regulations, Part F.11 (PDF)
... include normal fluoroscopy (analog or digital), high-level control fluoroscopy, cineradiography (analog and digital), digital subtraction angiography, electronic radiography using the fluoroscopic image receptor, and photospot recording. In a specific mode of operation, certain system variables affe ...
... include normal fluoroscopy (analog or digital), high-level control fluoroscopy, cineradiography (analog and digital), digital subtraction angiography, electronic radiography using the fluoroscopic image receptor, and photospot recording. In a specific mode of operation, certain system variables affe ...
communicating radiation risks in paediatric imaging
... health care. The level of awareness of health professionals about radiation doses and associated risks in medical imaging can be low. Referring medical practitioners need sufficient background, education and resources to communicate clearly and effectively about the benefits and risks of paediatric ...
... health care. The level of awareness of health professionals about radiation doses and associated risks in medical imaging can be low. Referring medical practitioners need sufficient background, education and resources to communicate clearly and effectively about the benefits and risks of paediatric ...
IAEA-PGEC-VIII.3P1Equipm_b - International Atomic Energy Agency
... Computed Tomography (CT) was introduced into clinical practice in 1972 and revolutionized X Ray imaging by providing high quality images which reproduced transverse cross sections of the body. Tissues are therefore not superimposed on the image as they are in conventional projections The technique o ...
... Computed Tomography (CT) was introduced into clinical practice in 1972 and revolutionized X Ray imaging by providing high quality images which reproduced transverse cross sections of the body. Tissues are therefore not superimposed on the image as they are in conventional projections The technique o ...
Experimental measurement of x-ray scatter
... shown in figure 1(c). It should be noted that this novel technique was already validated in our previous study (Johns and Yaffe 1982). By adequately choosing the dimensions of the lead bars, each shadowed area in a projection image was as small as possible while completely blocking the primary x-ray ...
... shown in figure 1(c). It should be noted that this novel technique was already validated in our previous study (Johns and Yaffe 1982). By adequately choosing the dimensions of the lead bars, each shadowed area in a projection image was as small as possible while completely blocking the primary x-ray ...
3D Surface Imaging for PBI Patient Setup G.T.Y. Chen , Ph.D., M. Riboldi
... TRE as a function of breast size and height above chest wall. Protocol extended to 300 PBI patients. Intra-fractional dosimetric variations due to breathing ...
... TRE as a function of breast size and height above chest wall. Protocol extended to 300 PBI patients. Intra-fractional dosimetric variations due to breathing ...
Soft-Tissue Tumors and Tumorlike Lesions
... for imaging to evaluate a softtissue mass in the trunk or extremities. These lesions range from nonneoplastic conditions to benign and malignant tumors. Presently, imaging provides a limited ability to reliably distinguish between benign and malignant soft-tissue lesions. Thus, the primary goal for ...
... for imaging to evaluate a softtissue mass in the trunk or extremities. These lesions range from nonneoplastic conditions to benign and malignant tumors. Presently, imaging provides a limited ability to reliably distinguish between benign and malignant soft-tissue lesions. Thus, the primary goal for ...
Mammography-Chapter 8
... Targets used in combination with specific tube filters to achieve optimal energy spectra ...
... Targets used in combination with specific tube filters to achieve optimal energy spectra ...
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.