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KMID : 1151820200140010007
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Journal of the Korean Society of Radiology
2020 Volume.14 No. 1 p.7 ~ p.14
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Quantitative Analysis of 3D-CRT Radiotherapy Planning Factors with or without IR in Patients with High Density Artifacts
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Lee Gyu-Wook
Choi U-Hyeong
Jung Yae-Hyun
Lee Joo-Hee
Yoon In-Ha
Heo Yeong-Cheol
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Abstract
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The purpose of this study is to assess the usefulness of IR to compensate for uncertainties in inserting high density artificial objects in radiation treatment planning in the 3D-CRT treatment technique. CT images of the subjects with phantom and titanium inserted were obtained from images without IR and images with IR, and the dose evaluation factors HI, MU and volume evaluation factors Volume and PCI were compared. The results of the stainless steel and titanium phantom experiments showed that the volume of high density artificial material was reduced by 4.850% and 11.456% respectively when applying IR. MU decreased 0.924% and 1.181%. HI was down 0.106% and 0.272%. PCI decreased 0.358% and 0.867%. When IR was applied to CT images of subjects with vertebroplasty, Femur alignment pin and wrist alignment pin, the volume of artifacts decreased by 47.76%, 23.841%, and 49.339%. MU also decreased 0.924%, 0.294% and 1.675%, while HI decreased 1.232%, 0.412% and 1.695%. PCI decreases 4.022%, 0.512%, and 13.472%. In conclusion, When IR was applied to 3D-CRT treatment plan, both dose and volume in phantom and subject case with high density artificial insert were reduced.
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KEYWORD
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3D-CRT, IR, Radiotherapy planning, cancer, artificial insertion
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