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Open Access 01-12-2012 | Research

Four-dimensional measurement of the displacement of metal clips or postoperative surgical staples during 320-multislice computed tomography scanning of gastric cancer

Authors: Hideomi Yamashita, Kae Okuma, Wataru Takahashi, Akira Sakumi, Akihiro Haga, Kenji Ino, Masaaki Akahane, Kuni Ohtomo, Keiichi Nakagawa

Published in: Radiation Oncology | Issue 1/2012

Abstract

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 > 0.7) 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 = 6), middle (n = 4), and lower (n = 5) stomach regions; b) between metal clips (n = 5) and surgical staples (n = 10); and c) between full (n = 9) and empty (n = 6) 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.

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Title: Four-dimensional measurement of the displacement of metal clips or postoperative surgical staples during 320-multislice computed tomography scanning of gastric cancer
Authors: Hideomi Yamashita
Kae Okuma
Wataru Takahashi
Akira Sakumi
Akihiro Haga
Kenji Ino
Masaaki Akahane
Kuni Ohtomo
Keiichi Nakagawa
Publication date: 01-12-2012
Publisher: BioMed Central
Published in: Radiation Oncology / Issue 1/2012
Electronic ISSN: 1748-717X
DOI: https://doi.org/10.1186/1748-717X-7-137

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Four-dimensional measurement of the displacement of metal clips or postoperative surgical staples during 320-multislice computed tomography scanning of gastric cancer

Abstract

Purpose

Methods

Results

Conclusions

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusions

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