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KMID : 1038720180290020047
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Progress in Medical Physics
2018 Volume.29 No. 2 p.47 ~ p.52
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Effect of Low Magnetic Field on Dose Distribution in the SABR Plans for Liver Cancer
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Son Jae-Man
Chun Min-Soo
An Hyun-Joon
Kang Seong-Hee
Chie Eui-Kyu
Yoon Jeong-Min
Choi Chang-Heon
Park Jong-Min
Kim Jung-In
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Abstract
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To investigate the effect of low magnetic field on dose distribution in SABR plans for liver cancer, we calculated and evaluated the dose distribution to each organ with and without magnetic fields. Ten patients received a 50 Gy dose in five fractions using the ViewRay® treatment planning system. For planning target volume (PTV), the results were analyzed in the point minimum (Dmin), maximum (Dmax), mean dose (Dmean) and volume receiving at least 90% (V90%), 95% (V95%), and 100% (V100%) of the prescription dose, respectively. For organs at risk (OARs), the duodenum and stomach were analyzed with D0.5cc and D2cc, and the remained liver except for PTV was analyzed with Dmean, Dmax, and Dmin. Both inner and outer shells were analyzed with the point Dmin, Dmax, and Dmean, respectively. For PTV, the maximum change in volume due to the presence or absence of the low magnetic field showed a percentage difference of up to 0.67±0.60%. In OAR analysis, there is no significant difference for the magnetic field. In both shell structure analyses, although there are no major changes in dose distribution, the largest value of deviation for Dmax in the outer shell is 2.12±2.67 Gy. The effect of low magnetic field on dose distribution by a Co-60 beam was not significantly observed within the body, but the dose deposition was only appreciable outside the body.
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KEYWORD
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Liver cancer, SABR, MR-IGRT, Magnetic field
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