SU-E-T-11: LINAC Dose Profiling Using Cherenkov Emission Imaging

Medical Physics
Adam K GlaserBrian W Pogue

Abstract

To demonstrate the potential for fast 3D dose profile imaging of a LINAC beam using images of the induced Cherenkov radiation in a water tank. A specialized time-gated imaging system was developed as a prototype to quantify and compare with Monte Carlo, to illustrate the concept. Images were acquired from a water tank during irradiation from a 6 MV Varian-2100C linear accelerator beam using a time-gated CCD-based imaging system. The camera was placed normal to the tank wall to minimize parallax reflections, and resultant images were produced by evaluating the median of each pixel in a stack of 2000 images taken at a rate of 60 Hz with an exposure time of 10 ms. Experimental data was compared to images obtained from GEANT4 simulations of the optical setup. Examination of the scored quantities for dose and generated Cherenkov photons indicates that there is a strong similarity, which can be explained by considering the electron energy losses per unit path length. However, due to the complex convolution of the Cherenkov emission directionality and camera lens angular field of view, this relationship is distorted. These errors can be calibrated using the GEANT4 simulations to more accurately reflect the intrinsic dose in the water ...Continue Reading

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