Abstract
In late pregnancy the maternal ovaries are usually situated within a radius of 7·5 cm of the anterior iliac spine in the lateral projection and are unlikely to be more than 10 cm from this point. The lowest site recorded in the present series was 4 cm below the anterior superior iliac spine. In the antero-posterior projection, all the ovaries were located within an area bounded by lines 2 cm lateral, 5 cm medial, 9 cm superior and 4 cm inferior, to the anterior superior iliac spine. Consideration of these limits may assist in assessment of radiation dosages to the maternal ovaries. It may also be of value in the adjustment of light beam diaphragms and cones and the placing of lead shields to obtain the maximum field of view with minimum X-ray exposure of the gonads.
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