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A review of factors affecting patient doses for barium enemas and meals

Health Physics, Department of Clinical Physics & Bio-Engineering, West House, Gartnavel Royal Hospital, Glasgow G12 0XH, UK

View larger version (34K): [in a new window]   Figure 1. Distribution of dose–area products (DAPs) for barium enemas in 20 hospitals in the West of Scotland with data recorded in Table 1 in ascending order of recorded DAP. The components from fluoroscopy and fluorography with the undercouch X-ray tube, and for decubitus imaging are included separately. For units A and G where decubitus images were recorded using the image intensifier and the same X-ray tube as the rest of the examination, an estimate has been made of the component for decubitus images.

View larger version (22K): [in a new window]   Figure 2. Distribution of dose–area products (DAPs) for barium meals in eight hospitals in the West of Scotland for groups of between 11 and 30 patients.

View larger version (15K): [in a new window]   Figure 3. Plot of mean values for dose–area product (DAP) to effective dose (ED) conversion factors derived from different studies; Hart and Wall 1994 [14] x , Gelijns et al 1997 [16] , Ruiz-Cruces et al 2000 [15] +, Kemerink et al 2001 [17] , Lampinen and Rannikko 1999 [18] , together with factors related to tube potential from Martin and Hunter 1994 [4] (solid line), and for a posteroanterior (PA) pelvis projection from Hart et al 1996 [13] (dashed line).