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The British Journal of Radiology, Vol 70, Issue 840 1280-1282, Copyright © 1997 by British Institute of Radiology

ARTICLES

An evaluation of correction factors applied to dose-area product meter readings for the use of sinus cones

LR Bridge and JE Ison
Mid Kent Medical Physics Services, Mid Kent Oncology Centre, Maidstone, UK.

As a result of the refurbishment of a dedicated skull radiography unit (Siemens Orbix) a dose-area product (DAP) meter was fitted into the light beam diaphragm/X-ray collimating system. Following calibration of the DAP system for X-ray beams defined by the unit's integral rectangular and octagonal iris diaphragms, DAP correction factors were obtained for the clinical use of externally fitted sinus cones. Correction factors can be derived from a simple ratio of coned to unconed beam areas, and these agree well with measured correction factors. The simple ratio of areas factor may be used in clinical practice to reduce potential errors.




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