Health physics aspects of the EMI computerized tomography brain scanner.

Published on Jan 1, 1978in Health Physics1.316
路 DOI :10.1097/00004032-197801000-00008
Theodore Villafana1
Estimated H-index: 1
,
Jim Scouras1
Estimated H-index: 1
+ 2 AuthorsPeter Paras1
Estimated H-index: 1
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Abstract
馃摉 Papers frequently viewed together
1987
3 Authors (Avinash C. Kak, ..., Ge Wang)
1980
1 Author (V. Perez-Mendez)
References0
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Cited By9
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#1Ulf Mostr枚m (Uppsala University)H-Index: 3
#2Christer Ytterbergh (Uppsala University)H-Index: 3
The spatial dose distribution in a cylindrical polystyrene phantom with a diameter of 200 mm was measured for seven computed tomography (CT) scanners. The measurements were performed in the head mode and mainly for narrow slices in the range 1.5 to 4 mm. Both radial and axial dose profiles were measured and the dose distribution for multiple-scan procedures was calculated. The ratio between the surface and centre doses for a single scan varied between the extremes of 1.8 and 4.3 and was generall...
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Abstract Whilst the anthropomorphic phantom is useful in radiotherapy dosimetry, corrections for diagnostic qualities of radiation are necessary for departures from tissue-equivalence. TLD measurements were performed for this reason in the rectum of patients undergoing CT scanning of the pelvis. At high slice densities the energy imparted becomes comparable with that associated with fluoroscopic examinations of the abdomen. At low slice densities the average dose is ca 12 mGy.
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#1Michael Chopp (UR: University of Rochester)H-Index: 161
#2Linda Ewald (UR: University of Rochester)H-Index: 1
Last. Mary Hartson (UR: University of Rochester)H-Index: 1
view all 3 authors...
An acrylic head phantom was irradiated during a computed tomographic scan with four commercial scanners. Measurements of the spatial distribution of the radiation dose on the surface and internal to the phantom were performed for the scan plane and the scattered beam at various distances from the scan plane. The surface scatter dose was found to be considerably smaller than that for internal scatter. A significant increase in radiation exposure within the head phantom due to internal radiation s...
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The patient dose delivered by six C.T. Scanners operated in both head and body modes has been assessed. Surface and internal doses have been measured as well as scattered dose to the gonads. Estimates of the integral dose to the patient have been made on these data. Differences in delivered dose of up to a factor of eight are found between different models.
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Abstract The doses delivered to some critical organs of patients and staff during cerebral angiography, X-ray computer assisted tomographic scanning and 99Tcm brain scanning have been measured or assessed. The results show that doses received by staff and by the patients' gonads are generally quite low. However, patients having two or more of the investigations could receive skin and orbit doses in excess of 25 rad.
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#1B. F. WallH-Index: 1
#2D. A. C. GreenH-Index: 1
Last. R. VeerappanH-Index: 1
view all 3 authors...
Abstract Absorbed doses throughout the head of a Rando standard man phantom have been measured during simulated neurological examinations with the EMI Mk I brain scanner and the second generation CT 1010 brain scanner. Similar measurements have been made with the CT 5005 wholebody scanner which have also included scans through thoracic and abdominal sections of the phantom. Lithium borate thermoluminescent dosimeters placed at regular intervals throughout, and on either side of the scanned volum...
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