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Anetai Y, Sumida I, Kumazaki Y, Kito S, Kurooka M, Ueda Y, Otani Y, Narita Y, Kawamorita R, Akita K, Kato T, Nakamura M. Assessment of using a gamma index analysis for patient-specific quality assurance in Japan. J Appl Clin Med Phys 2022; 23:e13745. [PMID: 36018627 PMCID: PMC9588274 DOI: 10.1002/acm2.13745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Revised: 07/07/2022] [Accepted: 07/13/2022] [Indexed: 11/06/2022] Open
Abstract
PURPOSE The Task Group 218 (TG-218) report was published by the American Association of Physicists in Medicine in 2018, recommending the appropriate use of gamma index analysis for patient-specific quality assurance (PSQA). The paper demonstrates that PSQA for radiotherapy in Japan appropriately applies the gamma index analysis considering TG-218. MATERIALS/METHODS This survey estimated the acceptance state of radiotherapeutic institutes or facilities in Japan for the guideline using a web-based questionnaire. To investigate an appropriate PSQA of the facility-specific conditions, we researched an optimal tolerance or action level for various clinical situations, including different treatment machines, clinical policies, measurement devices, staff or their skills, and patient conditions. The responded data were analyzed using principal component analysis (PCA) and multidimensional scaling (MDS). The PCA focused on factor loading values of the first contribution over 0.5, whereas the MDS focused on mapped distances among data. RESULTS Responses were obtained from 148 facilities that use intensity-modulated radiation therapy (IMRT), which accounted for 42.8% of the probable IMRT use in Japan. This survey revealed the appropriate application of the following universal criteria for gamma index analysis from the guideline recommendation despite the facility-specific variations (treatment machines/the number of IMRT cases/facility attributes/responded [representative] expertise or staff): (a) 95% pass rate, (b) 3% dose difference and 2-mm distance-to-agreement, and (c) 10% threshold dose. Conditions (a)-(c) were the principal components of the data by the PCA method and were mapped in a similar distance range, which was easily clustered from other gamma index analytic factors by the MDS method. Conditions (a)-(c) were the universally essential factors for the PSQA in Japan. CONCLUSION We found that the majority of facilities using IMRT in each region of Japan complied with the guideline and conducted PSQA with deliberation under the individual facility-specific conditions.
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Affiliation(s)
- Yusuke Anetai
- Department of Radiology, Kansai Medical University, Hirakata-shi, Osaka, Japan
| | - Iori Sumida
- Department of Radiation Oncology, Osaka University Graduate School of Medicine, Suita-shi, Osaka, Japan.,Physics and clinical support, Accuray Japan K.K., Chiyoda-ku, Tokyo, Japan
| | - Yu Kumazaki
- Department of Radiation Oncology, International Medical Center, Saitama Medical University, Hidaka-shi, Saitama, Japan
| | - Satoshi Kito
- Department of Radiotherapy, Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital, Bunkyo-ku, Tokyo, Japan
| | - Masahiko Kurooka
- Department of Radiology, Tokyo Medical University Hospital, Shinjuku-ku, Tokyo, Japan
| | - Yoshihiro Ueda
- Department of Radiation Oncology, Osaka International Cancer Institute, Osaka-shi, Osaka, Japan
| | - Yuki Otani
- Department of Radiology, Kaizuka City Hospital, Kaizuka, Osaka, Japan
| | - Yuichiro Narita
- Department of Medical Physics, High Precision Radiation Therapy Center, Aomori Shintoshi Hospital, Aomori-shi, Aomori, Japan
| | - Ryu Kawamorita
- Department of Radiation Oncology, Tane General Hospital, Osaka-shi, Osaka, Japan
| | - Kazuhiko Akita
- Kansai BNCT Medical Center, Osaka Medical and Pharmaceutical University, Takatsuki-shi, Osaka, Japan
| | - Takahiro Kato
- Department of Radiological Sciences, School of Health Sciences, Fukushima Medical University, Fukushima-shi, Fukushima, Japan
| | - Mitsuhiro Nakamura
- Division of Medical Physics, Department of Information Technology and Medical engineering, Human Health Sciences, Graduate School of Medicine, Kyoto University, Sakyo-ku, Kyoto, Japan
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