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Purpose:We aimed to evaluate the entrance skin dose(ESD)during radiofrequency catheter ablation (RFCA). Methods:The X-ray fluoroscopic mode(70 kV,7.5 p/s,13.0×13.0 cm)was evaluated at C-arm angles of 45°left anterior oblique and 35°right anterior oblique. The bed height was raised by 4 to 8 cm from the bed base-point position (BP,0 cm). Fluoroglass dosimeters were placed in three lines at 5-cm intervals on the surface of the phantom. The maximum skin dose conversion factors were calculated as the ratio of the calculated and the actual maximum skin doses. Results:At heights of 6 and 8 cm,calculated ESDs had peak values of 93.0±0.2 and 74.5±2.7 mGy,respectively, whereas the actual maximum skin doses were in the range of 47.4±0.2 to 59.5±0.2 mGy. The maximum skin dose conversion factors were 0.79,0.87,0.53,0.64,and 0.72 at bed heights of 0,2,4,6,and 8 cm from the BP,respectively. Conclusion:A maximum skin dose conversion factor should be taken into consideration when determining the maximum skin dose in overlapping irradiation fields.

Evaluation of the Entrance Skin Dose in Overlapping Irradiation Fields Using an Area Dosimeter during Radiofrequency Catheter Ablation