Measurement of Dose-Area Product with GafChromic XR Type R Film

Abstract

Abstract: Many of the newer x-ray machines are equipped with electronic means to provide dose area product (DAP) information. For machines without that ability, an alternate method could be the recording of radiation on a film that could handle large amount of cumulative exposure. The use of GafChromic XR Type R film was investigated for this purpose by placing it at the x-ray tube assembly to record the radiation in interventional radiological procedures. DAP was determined with a reflective densitometer and then with a flatbed scanner. Precisions were demonstrated to be 5% and 2% respectively. In a comparison with the machine recorded DAP, a regression analysis showed the validity of both techniques for values less than 1200 Gycm2.