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http://dx.doi.org/10.14316/pmp.2013.24.4.295

Estimation of Secondary Scattered Dose from Intensity-modulated Radiotherapy for Liver Cancer Cases  

Kim, Dong Wook (Department of Radiation Oncology, Kyung Hee University Hospital at Gandong)
Sung, Jiwon (Department of Bio-convergence Engineering, Korea University)
Lee, Hyunho (Department of Bio-convergence Engineering, Korea University)
Yoon, Myonggeun (Department of Bio-convergence Engineering, Korea University)
Chung, Weon Kuu (Department of Radiation Oncology, Kyung Hee University Hospital at Gandong)
Bae, Sun Hyun (Department of Radiation Oncology, Kyung Hee University Hospital at Gandong)
Shin, Dong Oh (Department of Radiation Oncology, Kyung Hee University Medical Center)
Chung, Kwangzoo (Department of Radiation Oncology, Samsung Medical Center)
Lim, Young Kyung (Proton Therapy Center, National Cancer Center)
Shin, Donho (Proton Therapy Center, National Cancer Center)
Lee, Se Byeong (Proton Therapy Center, National Cancer Center)
Publication Information
Progress in Medical Physics / v.24, no.4, 2013 , pp. 295-302 More about this Journal
Abstract
We estimated secondary scattered and leakage doses for intensity-modulated radiotherapy (IMRT), volumetric arc therapy (VMAT) and tomotherapy (TOMO) in patients with liver cancer. Five liver patients were planned by IMRT, VMAT and TOMO. Secondary scatter (and leakage) dose and organ equivalent doses (OEDs) are measured and estimated at various points 20 to 80 cm from the iso-center by using radiophotoluminescence glass dosimeter (RPLGD). The secondary dose per Gy from IMRT, VMAT and TOMO for liver cancer, measured 20 to 80 cm from the iso-center, are 0.01~3.13, 0.03~2.34 and 0.04~1.29 cGy, respectively. The mean values of relative OED of secondary dose of VMAT and TOMO for five patients, which is normalized by IMRT, measured as 75.24% and 50.92% for thyroid, 75.14% and 40.61% for bowel, 72.30% and 47.77% for rectum, 76.21% and 49.93% for prostate. The secondary dose and OED from TOMO is relatively low to those from IMRT and VMAT. OED based estimation suggests that the secondary cancer risk from TOMO is less than or comparable to the risks from conventional IMRT and VMAT.
Keywords
Liver cancer; Scatter; Leakage; Intensity-modulated radiotherapy; Volumetric Arc therapy; Helical tomotherapy;
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