Comprehensive quality assurance of a surface-guided radiotherapy system using a new anthropomorphic add-on phantom in a modular setup
Dierl M, Schönfeld AA, Casares-Magaz O, Bert C, Chofor N (2025)
Publication Type: Journal article
Publication year: 2025
Journal
DOI: 10.1016/j.zemedi.2025.10.003
Abstract
Purpose: To demonstrate the suitability of a new anthropomorphic phantom add-on to an existing end-to-end phantom for the quality assurance (QA) of a surface-guided radiotherapy (SGRT) system following ESTRO-ACROP guidelines. Methods: Tests were performed at C-arm linac equipped with a SGRT system. Positional accuracy QA for the SGRT system was assessed in 6 degrees-of-freedom by comparing against the cone-beam computed tomography registration as ground truth. Finally, the effectiveness in tracking and guiding dynamic dose delivery was tested completing end-to-end tests for a simulated sinusoidal and deep-inspiration breath hold (DIBH) treatment deliveries using the phantom-detector setup over a dynamic platform. Results: Positioning accuracy of the SGRT system was within ±0.5mm/±0.5°. For gated delivery with a 5mm tolerance window, the 2%/3mm gamma metric (global gamma, 10% threshold) achieved pass rates of 100% for a sine waveform and 96.5% for a DIBH waveform. End-to-end tests with a 2%/1mm gamma criterion yielded passing rates of 100% for the single-target and 95.3% for the multi-metastasis target plan. Conclusions: A comprehensive QA of a SGRT system was successfully conducted using the new phantom, in accordance with ESTRO-ACROP guidelines. The newly developed anthropomorphic add-on facilitates the comprehensive evaluation of end-to-end positioning accuracy and delivery precision by integrating SGRT with widely adopted equipment in the field of stereotactic radiotherapy.
Authors with CRIS profile
Involved external institutions
Germany (DE)
United States (USA) (US)How to cite
APA:
Dierl, M., Schönfeld, A.A., Casares-Magaz, O., Bert, C., & Chofor, N. (2025). Comprehensive quality assurance of a surface-guided radiotherapy system using a new anthropomorphic add-on phantom in a modular setup. Zeitschrift für Medizinische Physik. https://doi.org/10.1016/j.zemedi.2025.10.003
MLA:
Dierl, Mathias, et al. "Comprehensive quality assurance of a surface-guided radiotherapy system using a new anthropomorphic add-on phantom in a modular setup." Zeitschrift für Medizinische Physik (2025).
BibTeX: Download