Evaluation of the system accuracy of frameless stereotactic radiosurgery using a combination of cone beam CT, six degrees of freedom couch, and surface image-guided systems.
IF 2 4区 医学Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING
Hao-Wen Cheng, Jonathan Li, Sheng-Hsuan Sun, Guanghua Yan, Chihray Liu
{"title":"Evaluation of the system accuracy of frameless stereotactic radiosurgery using a combination of cone beam CT, six degrees of freedom couch, and surface image-guided systems.","authors":"Hao-Wen Cheng, Jonathan Li, Sheng-Hsuan Sun, Guanghua Yan, Chihray Liu","doi":"10.1002/acm2.70082","DOIUrl":null,"url":null,"abstract":"<p><strong>Purpose: </strong>This study aims to evaluate the accuracy of the frameless linear accelerator-based stereotactic radiosurgery (FSRS) system incorporating cone-beam CT (CBCT), six degrees of freedom (6-DoF) couch, room laser, and surface image-guided (SG) systems. It focuses on assessing the FSRS system's accuracy and ability to detect position errors using head phantoms at different couch angles. Turntables were used to simulate the couch rotation to overcome the limitation of the available couch rotation angles for a 360° CBCT scan.</p><p><strong>Methods: </strong>Two head phantoms, each positioned on its respective turntable, were used for measurements, with the turntables placed on the couch. Factors affecting the evaluations of the FSRS system's accuracy were analyzed, including quality assurance (QA) procedures for the SG system, the automatic CBCT-CT registration method, the CBCT clip box volume, and the selected region of interest (ROI) size in the SG system. Discrepancies in isocenter shifts between CBCT and SG systems were measured to evaluate the FSRS system's accuracy and its ability to correct isocenter shifts at different turntable angles. The FSRS system's ability to detect position errors at different turntable angles was also evaluated by introducing ± 2.0 mm translational errors.</p><p><strong>Results: </strong>With the appropriate CBCT-CT registration method and ROI size of the SG system, the accuracy evaluations of the FSRS system indicated average discrepancies between the readouts from the CBCT and the SG system ≤ 0.9 mm/0.8° for the head phantoms. Error simulation demonstrated that the FSRS system was able to detect position errors when 2 mm translational errors were intentionally introduced, with most average discrepancies < 1 mm/1°.</p><p><strong>Conclusion: </strong>This study introduces an innovative approach to quantifying the impact of couch rotation on the FSRS system using head phantoms with turntables. The overall accuracy of the FSRS system was on the order of 1.1 mm/1°.</p>","PeriodicalId":14989,"journal":{"name":"Journal of Applied Clinical Medical Physics","volume":" ","pages":"e70082"},"PeriodicalIF":2.0000,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Applied Clinical Medical Physics","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.1002/acm2.70082","RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING","Score":null,"Total":0}
引用次数: 0
Abstract
Purpose: This study aims to evaluate the accuracy of the frameless linear accelerator-based stereotactic radiosurgery (FSRS) system incorporating cone-beam CT (CBCT), six degrees of freedom (6-DoF) couch, room laser, and surface image-guided (SG) systems. It focuses on assessing the FSRS system's accuracy and ability to detect position errors using head phantoms at different couch angles. Turntables were used to simulate the couch rotation to overcome the limitation of the available couch rotation angles for a 360° CBCT scan.
Methods: Two head phantoms, each positioned on its respective turntable, were used for measurements, with the turntables placed on the couch. Factors affecting the evaluations of the FSRS system's accuracy were analyzed, including quality assurance (QA) procedures for the SG system, the automatic CBCT-CT registration method, the CBCT clip box volume, and the selected region of interest (ROI) size in the SG system. Discrepancies in isocenter shifts between CBCT and SG systems were measured to evaluate the FSRS system's accuracy and its ability to correct isocenter shifts at different turntable angles. The FSRS system's ability to detect position errors at different turntable angles was also evaluated by introducing ± 2.0 mm translational errors.
Results: With the appropriate CBCT-CT registration method and ROI size of the SG system, the accuracy evaluations of the FSRS system indicated average discrepancies between the readouts from the CBCT and the SG system ≤ 0.9 mm/0.8° for the head phantoms. Error simulation demonstrated that the FSRS system was able to detect position errors when 2 mm translational errors were intentionally introduced, with most average discrepancies < 1 mm/1°.
Conclusion: This study introduces an innovative approach to quantifying the impact of couch rotation on the FSRS system using head phantoms with turntables. The overall accuracy of the FSRS system was on the order of 1.1 mm/1°.
期刊介绍：
Journal of Applied Clinical Medical Physics is an international Open Access publication dedicated to clinical medical physics. JACMP welcomes original contributions dealing with all aspects of medical physics from scientists working in the clinical medical physics around the world. JACMP accepts only online submission.
JACMP will publish:
-Original Contributions: Peer-reviewed, investigations that represent new and significant contributions to the field. Recommended word count: up to 7500.
-Review Articles: Reviews of major areas or sub-areas in the field of clinical medical physics. These articles may be of any length and are peer reviewed.
-Technical Notes: These should be no longer than 3000 words, including key references.
-Letters to the Editor: Comments on papers published in JACMP or on any other matters of interest to clinical medical physics. These should not be more than 1250 (including the literature) and their publication is only based on the decision of the editor, who occasionally asks experts on the merit of the contents.
-Book Reviews: The editorial office solicits Book Reviews.
-Announcements of Forthcoming Meetings: The Editor may provide notice of forthcoming meetings, course offerings, and other events relevant to clinical medical physics.
-Parallel Opposed Editorial: We welcome topics relevant to clinical practice and medical physics profession. The contents can be controversial debate or opposed aspects of an issue. One author argues for the position and the other against. Each side of the debate contains an opening statement up to 800 words, followed by a rebuttal up to 500 words. Readers interested in participating in this series should contact the moderator with a proposed title and a short description of the topic
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
