Abstract
In radiotherapy practice, 1D and 2D dosimeters are used for dose verification prior to patient treatment. Along with high accuracy and precision of dose measurements that these dosimeters provide, acquisition of dose deposition data in three dimensions requires extrapolation of measured data. Development of a 3D dosimeter would provide continuous information of dose distribution in matter. In this work, NaCl 3D crystal has shown that radiation deposition can be imaged using blue laser stimulation in two dimensions. It was further shown that the intensity of collected signal has near – linear dose dependence, however complete signal readout is required, to compensate for gradual signal collection at different depths along the profile of the stimulating laser beam, due to attenuation of the beam within the crystal. A method to extend dose measurement to three dimensions using imaging is proposed.
Highlights
For the last few decades, there has been a major interest in three-dimensional dosimeters for ionizing radiation
It was further shown that the intensity of collected signal has near – linear dose dependence, complete signal readout is required, to compensate for gradual signal collection at different depths along the profile of the stimulating laser beam, due to attenuation of the beam within the crystal
Non-reusable 3D dose detection techniques utilize almost tissue equivalent polyacrylamide gels (PAG), Fricke gels or radiochromic plastics as dosimeter materials [1]. 3D dose distribution maps can be read-out by high resolution magnetic resonance imaging (MRI) and computed tomography (CT)
Summary
For the last few decades, there has been a major interest in three-dimensional dosimeters for ionizing radiation. Non-reusable 3D dose detection techniques utilize almost tissue equivalent polyacrylamide gels (PAG), Fricke gels or radiochromic plastics as dosimeter materials [1]. Present work investigated the feasibility of imaging the radiogenic Optically Stimulated Luminescence (OSL) signal from NaCl crystal, with the purpose of creating a new method for three-dimensional radiation dose distribution quantification utilizing a reusable material. The 3D image of dose deposition would be achieved by scanning the irradiated sample with a stimulating laser beam of appropriate wavelength, in XZ plane, while recording the emitted signal along the laser beam in XY plane, facing the camera. NaCl was chosen due to advantageous OSL dose response, excitation and emission [2]
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