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COMPARISON OF SURFACE DOSES FROM INDIRECT AND DIRECT DIGITAL RADIOGRAPHY USING OPTICALLY STIMULATED LUMINESCENCE
Su Chul Han1, Yong Ju Na2, Jung Seok Choi2
1Division of Medical Radiation Equipment, Korea Institute of Radiological and Medical Sciences, Seoul01812, Korea.
Abstract:
An optically stimulated luminescence dosemeter was used to compare the surface dose to both eyes from an X-ray delivered frontally to the skull, and the dose could be reduced depending on image acquisition. The detectors were analysed in advance according to each image acquisition method, and the irradiation condition (mA) was obtained to equate the detective quantum efficiency of the two detectors. The surface doses to both eyes were measured in a human phantom. In the detector using the direct conversion method, the surface doses to both eyes were 0.29 ± 0.01 mSv (Rt. eye) and 0.28 ± 0.01 mSv (Lt. eye). In the detector using the indirect conversion method, the surface doses to both eyes were 0.23 ± 0.01 mSv (Rt. eye) and 0.23 ± 0.01 mSv (Lt. eye). Dose reduction by 18.00 ± 8.9% was permitted by the indirect method as compared with the direct method.
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