ダウンロード数: 106
このアイテムのファイル:
ファイル | 記述 | サイズ | フォーマット | |
---|---|---|---|---|
acm2.12692.pdf | 1.29 MB | Adobe PDF | 見る/開く |
タイトル: | Variation in target volume and centroid position due to breath holding during four-dimensional computed tomography scanning: A phantom study |
著者: | Miyamae, Yuta Akimoto, Mami Sasaki, Makoto Fujimoto, Takahiro Yano, Shinsuke Nakamura, Mitsuhiro |
著者名の別形: | 藤本, 隆広 矢野, 慎輔 中村, 光宏 |
キーワード: | 4DCT breath‐holding time scan mode sorting algorithm |
発行日: | Jan-2020 |
出版者: | John Wiley and Sons Ltd |
誌名: | Journal of Applied Clinical Medical Physics |
巻: | 21 |
号: | 1 |
開始ページ: | 11 |
終了ページ: | 17 |
抄録: | This study investigated the effects of respiratory motion, including unwanted breath holding, on the target volume and centroid position on four‐dimensional computed tomography (4DCT) imaging. Cine 4DCT images were reconstructed based on a time‐based sorting algorithm, and helical 4DCT images were reconstructed based on both the time‐based sorting algorithm and an amplitude‐based sorting algorithm. A spherical object 20 mm in diameter was moved according to several simulated respiratory motions, with a motion period of 4.0 s and maximum amplitude of 5 mm. The object was extracted automatically, and the target volume and centroid position in the craniocaudal direction were measured using a treatment planning system. When the respiratory motion included unwanted breath‐holding times shorter than the breathing cycle, the root mean square errors (RSME) between the reference and imaged target volumes were 18.8%, 14.0%, and 5.5% in time‐based images in cine mode, time‐based images in helical mode, and amplitude‐based images in helical mode, respectively. In helical mode, the RSME between the reference and imaged centroid position was reduced from 1.42 to 0.50 mm by changing the reconstruction method from time‐ to amplitude‐based sorting. When the respiratory motion included unwanted breath‐holding times equal to the breathing cycle, the RSME between the reference and imaged target volumes were 19.1%, 24.3%, and 15.6% in time‐based images in cine mode, time‐based images in helical mode, and amplitude‐based images in helical mode, respectively. In helical mode, the RSME between the reference and imaged centroid position was reduced from 1.61 to 0.83 mm by changing the reconstruction method from time‐ to amplitude‐based sorting. With respiratory motion including breath holding of shorter duration than the breathing cycle, the accuracies of the target volume and centroid position were improved by amplitude‐based sorting, particularly in helical 4DCT. |
著作権等: | © 2019 The Authors. Journal of Applied Clinical Medical Physics published by Wiley Periodicals, Inc. on behalf of American Association of Physicists in Medicine. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
URI: | http://hdl.handle.net/2433/245676 |
DOI(出版社版): | 10.1002/acm2.12692 |
PubMed ID: | 31385421 |
出現コレクション: | 学術雑誌掲載論文等 |
このリポジトリに保管されているアイテムはすべて著作権により保護されています。