Assessing Leakage Workloads of Medical Linear Accelerators for IMRT and TBI Techniques
Current estimates for leakage workloads are not well quantified for Intensity Modulated Radiation Therapy (IMRT) and Total Body Irradiation (TBI) treatments. When analyzed on a large scale, using a large sample, a well defined leakage workload may be established. A database of 17 cancer treatment centers and 73 linear accelerators were used to make the assessment. There were 374,003 total treatments, with 213,757 low energy (4 and 6 MV) treatments, 106,343 of which were IMRT and 149,730 high energy (15, 16, 18, and 20 MV) treatments, 64,138 of which were IMRT. There were 184 TBI treatments, with 98 being low energy and 86 being high energy. The numbers are too scant to make any statements about the contribution TBI makes to workload, there is more than enough data to estimate the IMRT contribution to leakage workload. An IMRT factor, CI, of 5.1 may be used for low energy photon calculations, and a CI of 4.4 may be used for high energy photon calculations, where CI is: CI=MUIMRT/MUconv.
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