Year: 2015
Type: conference-abstract
Abstract: Purpose/Objective: Cherenkov emission from water tank is possible at 20 frames per second acquisition, and so this allows direct high resolution visualization of the delivery of IMRT and VMAT plans for the first time ever.This study focuses on the temporal and spatial capabilities of the first 2+D, and 3D Cherenkov water imaging systems.Materials and Methods: Cherenkov emission was imaged from a standard water tank, with 1g/L quinine sulphate in solution.The emission was detected using a time-gated ICCD camera synchronized to the LINAC pulses at 200Hz.Images were collected at 20Hz with room lights on, using background acquisition and subtraction.2+D imaging of TG-119 plans was done with imaging treatments from one perspective.3D imaging was done for a static beam by rotating the water tank and camera through 360 degrees during imaging.Results: 2+D imaging of delivery can be achieved with extremely high resolution (300 microns) using the appropriate lens and ICCD, and the ability to capture the volumetric temporal kinetics of delivery is unique to this type of imaging system.The agreement between Cerenkov image and dose map from the treatment planning system was greater than 96% from gamma analysis using a 3%/3mm criteria.3D imaging of individual beams illustrates how high resolution features of the MLC can be captured, and even leakage radiation through the closed MLCs and the end leakage can be visualized with high SNR.Conclusions: The niche area of Cherenkov imaging of IRMT/VMAT delivery in water tanks can allow for high
Source: Radiotherapy and Oncology
Institution: Dartmouth College
Language: English
Subfield: Radiation
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,770
OpenAlex ID: W2621173890