Dual wavelength optical CT scanning of anthropomorphic shaped 3D dosimeters

8th International Conference on 3D Radiation Dosimetry

De Deene, Yves^1

Department of Engineering, Faculty of Science, Macquarie University, Sydney, Australia^1

关键词: 3d dosimeters;    Dual wavelength;    Imaging artifacts;    Non-cylindrical;    Preirradiation;    Scanning techniques;    Transmission profiles;    Two different wavelengths;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/573/1/012058/pdf
DOI  :  10.1088/1742-6596/573/1/012058

来源: IOP

【 摘 要 】

To create an optical density map of 3D dosimeter phantoms, the ratio of the transmission profile (either a line or planar) acquired after irradiation of the dosimeter and a pre-irradiation reference scan of the same dosimeter phantom is taken. Any uncertainty in repositioning of the phantom may result in an uncertainty in the optical density map and finally also in the derived dose maps. Correct repositioning is paramount when scanning noncylindrical dosimeter phantoms as any repositioning error will give rise to severe imaging artifacts. We hereby propose a different scanning technique that does not require any repositioning of the dosimeter phantom. In this method, no pre-irradiation san is recorded but the dosimeter phantom is scanned twice with light at two different wavelengths. It is demonstrated that this method is accurate in scanning non-cylindrical anthropomorphic shaped phantoms.