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Verification of patient-setup accuracy using a surface imaging system with steep measurement angle
| Title: | Verification of patient-setup accuracy using a surface imaging system with steep measurement angle |
| Authors: | Sasaki, Fumihiro Browse this author | | Yamashita, Yuusuke Browse this author | | Nakano, Satoshi Browse this author | | Ishikawa, Masayori Browse this author →KAKEN DB |
| Keywords: | setup error | | skin marker | | surface-guided radiation therapy | | tomotherapy |
| Issue Date: | 20-Dec-2022 |
| Publisher: | John Wiley & Sons |
| Journal Title: | Journal of applied clinical medical physics |
| Volume: | 24 |
| Issue: | 4 |
| Start Page: | e13872 |
| Publisher DOI: | 10.1002/acm2.13872 |
| PMID: | 36537149 |
| Abstract: | Purpose: We evaluate an SGRT device (Voxelan HEV-600 M/RMS) installed with Radixact, with the view angle of the Voxelan's camera at 74 degrees. The accuracy of Voxelan with this steep angle was evaluated with phantom experiments and inter-fractional setup errors of patients. Methods: In the phantom experiments, the difference between the measured values of Voxelan from the truth was evaluated for translations and rotations. The inter-fractional setup error between the setup using skin markers with laser localizer (laser setup: LS) and the setup using Voxelan (surface setup: SS) was compared for head and neck (N = 19), chest (N = 7) and pelvis (N = 9) cases. The inter-fractional setup error was calculated by subtracting from bone matching by megavoltage computed tomography (MVCT) as ground truth. Results: From the phantom experiments, the average difference between the measured values of Voxelan from the truth was within 1 mm and 1 degree. In all cases, inter-fractional setup error based on MVCT was not significantly different between LS and SS by Welch's t-test (P > 0.05). The vector offset of the LS for head and neck, chest, and pelvis were 6.5, 9.6, and 9.6 mm, respectively, and that of the SS were 5.8, 8.6, and 12.6 mm, respectively. Slight improvement was observed for the head and neck, and chest cases, however, pelvis cases were not improved because the umbilical region could not be clearly visualized as a reference. Conclusion: The results show that SS in Voxelan with an installation angle of 74 degrees is equal to or better than LS. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/87737 |
| Appears in Collections: | 保健科学院・保健科学研究院 (Graduate School of Health Sciences / Faculty of Health Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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