A prototype optical-CT system for PRESAGE 3D dosimeter readout

9th International Conference on 3D Radiation Dosimetry

Miles, Devin^1 ; Yoon, Paul^1 ; Kodra, Jacob^1 ; Adamovics, John^2 ; Oldham, Mark^1

Dept. of Radiation Oncology, Duke University Medical Center, Durham

NC, United States^1

Dept. of Chemistry and Biology, Rider University, Lawrenceville

NJ, United States^2

关键词: 3d dosimeters;    CCD detectors;    Dose calculation;    Integrated lens;    Large volumes;    Multi-purpose;    Optical scanners;    Point sources;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/847/1/012026/pdf
DOI  :  10.1088/1742-6596/847/1/012026

来源: IOP

【 摘 要 】

This work introduces the Duke Integrated-lens Optical Scanner (DIOS), a prototype optical-CT system designed for convenient and low-cost readout of PRESAGE 3D dosimeters. A key novelty of the DIOS is the incorporation of a multi-purpose light-collimating tank (the LC-tank). The LC-tank collimates light from a point source, maintains parallel ray geometry through a dosimeter mounted inside the tank, and refocuses emergent light onto a CCD detector. A second purpose is to dramatically reduce the amount of refractive matched fluid required in prior optical-CT scanners. This is achieved by substituting large quantities of refractive-matched fluid with solid RI-matched polyurethane. The advantages of DIOS include eliminating the need for expensive telecentric lenses, and eliminating the impracticality of large volumes of RI matched fluid. The DIOS is potentially more susceptible to stray-light artifacts. Preliminary phantom testing shows promising agreement between PRESAGE/DIOS readout and prior commissioned optical-CT scanners, as well as with Eclipse dose calculations.