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SU‐FF‐T‐309: Quality Assurance for Imaging Guided Stereotactic RadioSurgery with Novalis Tx™ System

Publication ,  Conference
Chang, Z; Wang, Z; wu, Q; Bowsher, J; Yoo, S; Yin, F
Published in: Medical Physics
January 1, 2009

Purpose: To present QA measurements over extended periods at our institute and recommend a QA program for image‐guided radiosurgery on Novalis Tx system. Method and Materials: Novalis Tx system is developed based on a Trilogy linear accelerator featuring BrainLAB 6D‐ExacTrac, HD120‐MLC, MV‐EPID and KV‐OBI&CBCT. Utilization of any new technology and equipment necessitates a comprehensive QA program to maintain and monitor system performance characteristics. In this study, we carried out a systematic QA program, including linear accelerator QA, treatment planning QA, planning MRI and CT QA, treatment imaging QA, patient‐specific QA, and system setup procedures for image‐guided radiosurgery. Methodology, frequencies and criteria of QA tests were based on AAPM TG40, TG42, TG51, TG66, and ACR MRI QC. Results: Comprehensive QA was performed from March to December 2008. 1) Daily Winston‐Lutz tests of 199 measurements showed that isocenter of gantry rotation was 0.44±0.21mm; isocenter of couch rotation was 0.34±0.20mm, within 1mm tolerance. Other linear accelerator QA results were within TG40 criteria. 2) Treatment planning QA was conducted with spot‐checks and a RPC SRS head phantom test. In spot‐checks, dosimetric discrepancies were within 3% (3.5% for the 4mm cone). RPC radiosurgery test was passed with less than 1% dosimetric deviation, and 100% geometric match. 3) Daily MRI QA showed that average geometric distortion was −0.2±0.4mm, −0.3±0.4mm, and −0.9±0.1mm along vertical, lateral, and longitudinal directions, within 1mm on phantom, 50% of ACR specifications. 4) OBI QA showed that imaging isocenter displacement was 0.46±0.30mm at AP and 0.76±0.19mm at RLAT. 5) Over ten months, 128 patients with intracranial lesions were treated with radiosurgery. All second MU checks were within 3%, and there were none treatment errors associated with the SRS treatments. Conclusion: Comprehensive QA program for image‐guided radiosurgery has been developed with proper methodology, frequency and criteria on Novalis Tx system, demonstrated with extensive measurements. © 2009, American Association of Physicists in Medicine. All rights reserved.

Duke Scholars

Published In

Medical Physics

DOI

ISSN

0094-2405

Publication Date

January 1, 2009

Volume

36

Issue

6

Start / End Page

2592

Related Subject Headings

  • Nuclear Medicine & Medical Imaging
  • 5105 Medical and biological physics
  • 4003 Biomedical engineering
  • 1112 Oncology and Carcinogenesis
  • 0903 Biomedical Engineering
  • 0299 Other Physical Sciences
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Chang, Z., Wang, Z., wu, Q., Bowsher, J., Yoo, S., & Yin, F. (2009). SU‐FF‐T‐309: Quality Assurance for Imaging Guided Stereotactic RadioSurgery with Novalis Tx™ System. In Medical Physics (Vol. 36, p. 2592). https://doi.org/10.1118/1.3181789
Chang, Z., Z. Wang, Q. wu, J. Bowsher, S. Yoo, and F. Yin. “SU‐FF‐T‐309: Quality Assurance for Imaging Guided Stereotactic RadioSurgery with Novalis Tx™ System.” In Medical Physics, 36:2592, 2009. https://doi.org/10.1118/1.3181789.
Chang Z, Wang Z, wu Q, Bowsher J, Yoo S, Yin F. SU‐FF‐T‐309: Quality Assurance for Imaging Guided Stereotactic RadioSurgery with Novalis Tx™ System. In: Medical Physics. 2009. p. 2592.
Chang, Z., et al. “SU‐FF‐T‐309: Quality Assurance for Imaging Guided Stereotactic RadioSurgery with Novalis Tx™ System.” Medical Physics, vol. 36, no. 6, 2009, p. 2592. Scopus, doi:10.1118/1.3181789.
Chang Z, Wang Z, wu Q, Bowsher J, Yoo S, Yin F. SU‐FF‐T‐309: Quality Assurance for Imaging Guided Stereotactic RadioSurgery with Novalis Tx™ System. Medical Physics. 2009. p. 2592.

Published In

Medical Physics

DOI

ISSN

0094-2405

Publication Date

January 1, 2009

Volume

36

Issue

6

Start / End Page

2592

Related Subject Headings

  • Nuclear Medicine & Medical Imaging
  • 5105 Medical and biological physics
  • 4003 Biomedical engineering
  • 1112 Oncology and Carcinogenesis
  • 0903 Biomedical Engineering
  • 0299 Other Physical Sciences