Development of a fiber-optic dosimeter based on modified direct measurement for real-time dosimetry during radiation diagnosis

Abstract

For applying modified direct measurement, we developed a fiber-optic dosimeter (FOD) with two dosimeter probes to infer the entrance surface dose (ESD) at the center of an x-ray beam field without the obstruction of radiation imaging. The dosimeter probe of the FOD was fabricated by coupling a plastic scintillating fiber to a plastic optical fiber. Under varying exposure parameters, we measured the scintillating light signals using two dosimeter probes, which were placed at the center and the edge of the beam field, respectively, and compared the results with the absorbed doses obtained using a conventional semiconductor dosimeter. Various correlations between the two dosimeter probes according to the exposure parameters were obtained for measuring ESD using a new modified direct measurement approach during a medical imaging task.