Four-dimensional measurement of the displacement of metal clips or postoperative surgical staples during 320-multislice computed tomography scanning of gastric cancer
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- 作者：Hideomi Yamashita (1)
Kae Okuma (1)
Wataru Takahashi (1)
Akira Sakumi (1)
Akihiro Haga (1)
Kenji Ino (1)
Masaaki Akahane (1)
Kuni Ohtomo (1)
Keiichi Nakagawa (1) - 关键词：Intra ; fraction motion ; Four ; dimension computed tomography ; Gastric cancer ; Internal margin ; Respiratory motion
- 刊名：Radiation Oncology
- 出版年：2012
- 出版时间：December 2012
- 年：2012
- 卷：7
- 期：1
- 全文大小：654KB
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Kae Okuma (1)
Wataru Takahashi (1)
Akira Sakumi (1)
Akihiro Haga (1)
Kenji Ino (1)
Masaaki Akahane (1)
Kuni Ohtomo (1)
Keiichi Nakagawa (1)
1. Departments of Radiology, University of Tokyo Hospital, Tokyo, Japan
文摘
Purpose To investigate the respiratory motion of metal clips or surgical staples placed in the gastric wall for planning of radiation therapy in gastric cancer patients. Methods This study examined 15 metal markers in the gastric walls of 12 patients with gastric cancer treated with external-beam photon RT. Motion assessment was analyzed in 41 respiratory phases covering 20?s acquired with computed tomography (CT) in the RT position using 320-multislice CT. The intra-fraction displacement was assessed in the cranio-caudal (CC), antero-posterior (AP), and right-left (RL) directions. Results Motion in the CC direction showed a very strong correlation (R2-gt;-.7) with the respiratory curve in all 15 markers. The mean (+/?SD) intra-fractional gastric motion (maximum range of displacement) was 12.5 (+/?3.4) mm in the CC, 8.3 (+/?2.2) mm in the AP, and 5.5 (+/?3.0) mm in the RL direction. No significant differences in magnitude of motion were detected in the following: a) among the upper (n--), middle (n--), and lower (n--) stomach regions; b) between metal clips (n--) and surgical staples (n--0); and c) between full (n--) and empty (n--) stomachs. Conclusions Motion in primary gastric tumor was evaluated with 320-multislice CT. According to this study, the 95th percentile values from the cumulative distributions of the RL, AP, and CC direction were 6.3?mm, 9.0?mm, and 13.6?mm, respectively.