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British Journal of Radiology (1995) 68, 877-881
© 1995 British Institute of Radiology
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The British Journal of Radiology, Vol 68, Issue 812 877-881, Copyright © 1995 by British Institute of Radiology

ARTICLES

Assessment of mean glandular dose in mammography

K Faulkner, J Law and KJ Robson
Regional Medical Physics Department, Newcastle General Hospital, Newcastle upon Tyne, UK.

The routine assessment of patient dose in the National Health Service Breast Screening Programme is performed as part of the quality assurance protocol recommended by the Institute of Physical Sciences in Medicine. The mean glandular dose to a standard breast is deduced from measurement of the air kerma at the entrance surface of a 4 cm Perspex phantom by applying a series of conversion factors. The exposure factors for this measurement are those used clinically. The measured mean glandular dose is then compared with nationally accepted action levels. In some centres the assessment of mean glandular dose using Perspex is supplemented by patient dose surveys. The mean glandular dose to a series of patients attending a breast screening unit may be estimated from a knowledge of the exposure factors and compressed breast thickness, using a knowledge of the X-ray tube output. Measurements made on units in the Northern Region of England and in Scotland using both methods are presented. The implication of these measurements with regard to patient dose surveys in mammography and quality assurance programmes are discussed. An analysis of the uncertainties associated with the measurement techniques is presented.


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