Assessment of a commercially available automatic deformable image registration

Yoshiyuki Katsuta, Noriyuki Kadoya, Yukio Fujita, Yusuke Onozato, Kengo Ito, Tokihiro Yamamoto, Suguru Dobashi, Ken Takeda, Kazuma Kishi, Kiyokazu Satou, Youjiro Ishikawa, Takaya Yamamoto, Maiko Kozumi, Keiichi Jingu, Haruo Matsushita

研究成果: Conference contribution

2 被引用数 (Scopus)

抄録

Ventilation imaging can be performed using thoracic four dimensional computed tomography (4D-CT) images (max inhale phase and max exhale phase) and deformable image registration (DIR). If this method was administered in multi institution, some institution would use commercially available automatic DIR software. But, there are not many reports about commercially available automatic DIR. In this study, we evaluated the accuracy of a commercially available automatic deformable image registration (DIR) algorithm using 4D-CT images. For evaluating the accuracy of DIR, registration error was calculated by difference between manual displacement and automatic calculated displacement (DIR outputs). A B-spline DIR algorithm implemented in a Velocity AI ver. 2.7.0 software (Velocity Medial, GA, USA) was evaluated. 4D-CT images including 300 landmarks /case, throughout the lung, provided by DIR-lab (www.dir-lab.com). In this study, five patients were studied. The goal of DIR was to find a point to point correspondence between inhale image and exhale image. First, manual displacement was calculated by land mark points between max inhale phase and max exhale phase. Next, DIR outputs were calculated by a Velocity AI. After that, registration error was calculated by difference between manual displacement and DIR outputs. The mean 3D registration error (standard deviation) for the five cases was 2.70 (2.24) mm. Fewer large errors were seen, but the frequent histogram had a peak at 1.5mm of 3D error, and the frequencies decline as one moves away from the peak. The average 3D registration errors for case1 were 0.94 mm for 1.5 mm motion distance magnitude, 1.96 mm for 6.0 mm and 3.70 mm for 9.0 mm, respectively. Our result clearly shows that the accuracy of DIR in Velocity AI was within 3.0 mm. Therefore commercially available automatic DIR may be useful for image-guided radiation therapy, adaptive radiation therapy and ventilation imaging.

本文言語English
ホスト出版物のタイトルWorld Congress on Medical Physics and Biomedical Engineering
ページ1849-1852
ページ数4
DOI
出版ステータスPublished - 2013 4月 16
イベントWorld Congress on Medical Physics and Biomedical Engineering - Beijing, China
継続期間: 2012 5月 262012 5月 31

出版物シリーズ

名前IFMBE Proceedings
39 IFMBE
ISSN(印刷版)1680-0737

Other

OtherWorld Congress on Medical Physics and Biomedical Engineering
国/地域China
CityBeijing
Period12/5/2612/5/31

ASJC Scopus subject areas

  • バイオエンジニアリング
  • 生体医工学

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