B J Cobb | PubMed Health

PubMed1999

Estimating mean glandular dose using proprietary mammography phantoms.

Screening mammography programs prescribe limits on the radiation dose to the glandular tissue of a compressed breast--the Mean Glandular Dose (MGD)--which may vary between 2 and 3 mGy for a 50% adipose and 50% glandular tissue compressed breast of 4.2 to 5.0 cm thickness. Commercially available breast phantoms offer a choice of equivalent tissue thicknesses and composition ranging typically from 30% adipose and 70% glandular tissue to 50% adipose and 50% glandular tissue. A number of these phantom were compared under clinical conditions and the MGD calculated for each using the factors developed by Wu et al. [Wu, X., Barnes, G.T. and Tucker, D.M. (1991) Spectral dependence of glandular tissue dose in screen film mammography, Radiology 179, 143-148].

Australia↗

PubMed1999

A compliance testing program for diagnostic X-ray equipment.

Compliance testing is nominally that part of a quality assurance program dealing with those aspects of X-ray equipment performance that are subject to radiation control legislation. Quality assurance programs for medical X-ray equipment should be an integral part of the quality culture in health care. However while major hospitals and individual medical centers may implement such programs with some diligence, much X-ray equipment can remain unappraised unless there is a comprehensive regulatory inspection program or some form of compulsion on the equipment owner to implement a testing program. Since the late 1950s all X-ray equipment in the State of Western Australia has been inspected by authorized officers acting on behalf of the Radiological Council, the regulatory authority responsible for administration of the State's Radiation Safety Act. However, economic constraints, coupled with increasing X-ray equipment numbers and a geographically large State have significantly affected the inspection rate. Data available from inspections demonstrate that regular compliance and performance checks are essential in order to ensure proper performance and to minimize unnecessary patient and operator dose. To ensure that diagnostic X-ray equipment complies with accepted standards and performance criteria, the regulatory authority introduced a compulsory compliance testing program for all medical, dental and chiropractic diagnostic X-ray equipment effective from 1 January 1997.

Equipment Safety↗