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Figure 1. On the left(a), the radiologist performing a cardiac procedure with the lead apron and the trunk of the patient, viewed from above. The grey square indicates the position of the X-ray field. On the right (b), the same arrangement is viewed from the left-hand side of the radiologist. The position of the thyroid is indicated by the black rectangle. The coordinate system and the (suggestive) length scale are indicated in the figure. Here, the focal spot of the X-ray tube (black dot) is at z = –70 cm and corresponds to the posteroanterior (PA) projection. The primary X-ray beam is indicated by the dashed cone. The external personal dosimeter is indicated with a grey sphere.
