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Skin dose and dose–area product values for interventional cardiology procedures

¹ Medical Physics Service ³ Cardiology Service, San Carlos University Hospital ² Radiology Department, Medicine School, Complutense University, 28040 Madrid, Spain

View larger version (69K): [in a new window]   Figure 1. X-ray field images from coronary angiography procedures performed in facility HC-O. Procedure No. 27 (right) yielded a dose–area product (DAP) of 40.3 Gy cm2 and a maximum skin dose (MSD) of 296 mGy, with a mean field size of 71 cm2 and a total irradiated area of 836 cm2. Data from procedure No. 57 (left) were 44.1 Gy cm2 DAP and 161 mGy MSD with a mean field size 90 cm2 and a total irradiated area of 900 cm2. Note that DAP and mean field size were higher in No. 57 for a similar irradiated area, but that MSD was higher in No. 27 owing to higher field concentration. Accordingly, the concentration factor is 6.2 for No. 27 and only 3.3 for No. 57.

View larger version (61K): [in a new window]   Figure 2. X-ray field images from coronary angiography procedure No. 37 performed in facility RI (left) and procedure No. 53 performed in facility RJB (right), illustrating differences in beam collimation between them (larger fields and quite superimposed in No. 53 compared with No. 37) and with respect to Figure 1.