دورية أكاديمية
MR-linac MLC positioning QA by digitally stitching dual double-exposed films.
| العنوان: | MR-linac MLC positioning QA by digitally stitching dual double-exposed films. |
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| المؤلفون: | Sun SH; Department of Radiation Oncology, University of Florida, Gainesville, Florida, USA., Kollitz E; Department of Radiation Oncology, University of Florida, Gainesville, Florida, USA., Tseng WC; Department of Radiation Oncology, University of Florida, Gainesville, Florida, USA., Schwarz A; Department of Radiation Oncology, University of Florida, Gainesville, Florida, USA., Maloney L; Department of Radiation Oncology, University of Florida, Gainesville, Florida, USA., Li J; Department of Radiation Oncology, University of Florida, Gainesville, Florida, USA., Liu C; Department of Radiation Oncology, University of Florida, Gainesville, Florida, USA., Yan G; Department of Radiation Oncology, University of Florida, Gainesville, Florida, USA. |
| المصدر: | Journal of applied clinical medical physics [J Appl Clin Med Phys] 2024 Jul; Vol. 25 (7), pp. e14325. Date of Electronic Publication: 2024 Mar 11. |
| نوع المنشور: | Journal Article |
| اللغة: | English |
| بيانات الدورية: | Publisher: Wiley on behalf of American Association of Physicists in Medicine Country of Publication: United States NLM ID: 101089176 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1526-9914 (Electronic) Linking ISSN: 15269914 NLM ISO Abbreviation: J Appl Clin Med Phys Subsets: MEDLINE |
| أسماء مطبوعة: | Publication: 2017- : Malden, MA : Wiley on behalf of American Association of Physicists in Medicine Original Publication: Reston, VA : American College of Medical Physics, c2000- |
| مواضيع طبية MeSH: | Radiotherapy Planning, Computer-Assisted*/methods , Quality Assurance, Health Care*/standards , Radiotherapy Dosage* , Radiotherapy, Intensity-Modulated*/methods , Particle Accelerators*/instrumentation, Humans ; Magnetic Resonance Imaging/methods ; Film Dosimetry/methods ; Film Dosimetry/instrumentation ; Phantoms, Imaging ; Neoplasms/radiotherapy |
| مستخلص: | Purpose: The picket fence (PF) test is highly recommended for multi-leaf collimator (MLC) quality assurance. However, since the electronic portal imaging device (EPID) on the Elekta Unity only covers a small area, it is not feasible to perform the PF test for the entire MLC. Here, we propose a technique for the PF test by stitching two double-exposed films. Methods: Two EBT3 films were used to encompass the entire MLC, with each one covering one half of the area. Two fields were employed to apply double exposure: a PF pattern consisting of 11 2 mm wide pickets and a 2.84 cm x 22 cm open field. The edges of the open field defined by the diaphragms were used to correct film rotation as well as align them horizontally. The PF pattern was also measured with the EPID where the pickets were used to align the films vertically. Individual leaf positions were detected on the merged film for quantitative analysis. Various MLC positioning errors were introduced to evaluate the technique's sensitivity. Results: The merged films covered 72 leaf pairs properly (four leaf pairs on both sides were outside the treatment couch). With the EPID, the leaf positioning accuracy was -0.02 ± 0.07 mm (maximum: 0.29 mm) and the picket width variation was 0.00 ± 0.03 mm (maximum: 0.11 mm); with the films, the position accuracy and width variation were -0.03 ± 0.13 mm (maximum: 0.80 mm) and 0.00 ± 0.13 mm (maximum: 0.74 mm), respectively. The EPID was able to detect errors of 0.5 mm or above with submillimeter accuracy; the films were only able to detect errors > 1.0 mm. Conclusion: We developed a quantitative technique for the PF test on the Elekta Unity. The merged films covered nearly the entire MLC leaf banks. The technique exhibited clinically acceptable accuracy and sensitivity to MLC positioning errors. (© 2024 The Authors. Journal of Applied Clinical Medical Physics is published by Wiley Periodicals, Inc. on behalf of The American Association of Physicists in Medicine.) |
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| فهرسة مساهمة: | Keywords: Elekta Unity; MLC positioning accuracy; MR‐linac; Picket Fence test |
| تواريخ الأحداث: | Date Created: 20240311 Date Completed: 20240712 Latest Revision: 20240714 |
| رمز التحديث: | 20240714 |
| مُعرف محوري في PubMed: | PMC11244661 |
| DOI: | 10.1002/acm2.14325 |
| PMID: | 38467039 |
| قاعدة البيانات: | MEDLINE |
Full Text Finder | تدمد: | 1526-9914 |
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| DOI: | 10.1002/acm2.14325 |