According to ICRP Publication 105, Diagnostic Reference Levels (DRLs) for interventional radiology (IR) are used to promote the management of patient doses with a view to avoid stochastic effects. In addition, the document recommends that the maximum radiation skin dose (MSD) should be monitored in real time during actual IR procedures to avoid deterministic effects. This research has two major purposes. One of the purposes of this study was to compare the
angiographic parameters in percutaneous coronary interventions (PCIs) at 5 facilities, such as fluoroscopic time (FT), kerma-area product (KAP) and cumulative air kerma (AK). The other purpose was to measure accurate patient entrance skin dose (ESD) and maximum skin absorbed dose (MSD) to prevent radiation skin injuries in PCIs. We directly measured the MSD on 165 PCIs at 5 facilities by using multiple radiophotoluminescence glass dosimeters and a modified doimetry gown. Also, we analyzed the correlation between the MSD and FT, KAP and AK. The 75th percentiles of FT, KAP and AK in this study were 37.7 min, 145.3 Gy cm? respectively. There were very strong correlations between MSD and FT, KAP, and AK, with the correlation between MSD and AK being the strongest (r = 0.89). In conclusion, the regression lines using MSD as an outcome value (y) and AK as predictor variables (x) was y = 1.09x (r2=0.80). From the linear regression equation, MSD is estimated to be about 1.09 times that of AK in real time.
|