Impact of the Lok-bar for High-precision Radiotherapy with Tomotherapy

被引：2
作者：
Hirata, Makoto [1 ]
Monzen, Hajime [1 ]
Tamura, Mikoto [1 ,2 ]
Kubo, Kazuki [1 ,3 ]
Matsumoto, Kenji [1 ,2 ]
Hanaoka, Kohei [1 ,2 ]
Okumura, Masahiko [2 ]
Nishimura, Yasumasa [4 ]
机构：
[1] Kindai Univ, Grad Sch Med Sci, Dept Med Phys, 377-2 Ohno Higashi, Osakasayama, Osaka 5898511, Japan
[2] Kindai Univ Hosp, Dept Cent Radiol, Osaka, Japan
[3] Tane Gen Hosp, Dept Radiat Oncol, Osaka, Japan
[4] Kindai Univ, Fac Med, Dept Radiat Oncol, Osaka, Japan
来源：
ANTICANCER RESEARCH | 2018年 / 38卷 / 05期
关键词：
Artifacts; immobilizer; lok-bar; tomotherapy; HELICAL TOMOTHERAPY; RADIATION-THERAPY; IRRADIATION; ABSORPTION;
D O I：
10.21873/anticanres.12515
中图分类号：
R73 [肿瘤学];
学科分类号：
100214 ;
摘要：
Background/Aim: Patient immobilization systems are used to establish a reproducible patient position relative to the couch. In this study, the impact of conventional lokbars for CT-simulation (CIVCO-bar) and treatment (iBEAMbar) were compared with a novel lok-bar (mHM-bar) in tomotherapy. Materials and Methods: Verification was obtained as follows: i. artifacts in CT images; ii. dose attenuation rate of lok-bar, compared to without lok-bar; and iii. dose differences between the calculated and measured absorbed doses. Results: With the CIVCO-bar, there were obvious metal artifacts, while there were nearly no artifacts with the mHM-bar. The mean dose attenuation rates with the mHM-bar and iBEAM-bar were 1.31% and 2.28%, and the mean dose difference was 1.55% and 1.66% for mHM-bar and iBEAM-bar. Conclusion: Using the mHM-bar reduced artifacts on the CT image and improved dose attenuation are obtained. The lok-bar needs to be inserted as a structure set in treatment planning with tomotherapy.
引用
收藏
页码：2733 / 2738
页数：6
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