Record Display for the EPA National Library Catalog

RECORD NUMBER: 33 OF 38

OLS Field Name OLS Field Data
Main Title Study of Head and Neck Exposure from Polytomography.
Author Cassad, J. Robert ; Pierc, Robert N. ;
CORP Author Bureau of Radiological Health, Rockville, Md. Div. of Electronic Products.
Year Published 1970
Report Number BRH/DEP-70-27;
Stock Number PB-195 702
Additional Subjects ( Radiography ; Radiation hazards) ; Radiation dosage ; X rays ; Exposure ; Head(Anatomy) ; Neck(Anatomy) ; Partial body irradiation ; Polytomography
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB-195 702 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 18p
Abstract
An investigation was conducted to determine radiation exposures to the head and neck regions of patients undergoing polytomographic studies of the sella turcica, paranasal sinuses, and petrous pyramid. The highest exposures were measured at the eyelid region for studies of the sella turcica and paranasal sinuses. In studies of the petrous pyramid, the highest exposures were recorded in the external auditory canals. Variation in the total number of exposures, the ratio of frontal and lateral exposures, and beam collimation are cided as principal causes of the wide range of values recorded for a given dosimeter location and type of examination. To reduce eye exposures, it is recommended that PA rather than AP projections be used for tomography of the petrous pyramid, sella turcica, sphenoid sinus, and other mid- and posteriorly-located structures of the skull. (Author)