Real-world examples of sensitivity failures of the 3%/3mm pass rate metric and published action levels when used in IMRT/VMAT system commissioning Journal Article
| Authors: | Nelms, B.; Jarry, G.; Chan, M.; Hampton, C.; Watanabe, Y.; Feygelman, V. |
| Article Title: | Real-world examples of sensitivity failures of the 3%/3mm pass rate metric and published action levels when used in IMRT/VMAT system commissioning |
| Abstract: | In IMRT/VMAT system commissioning (as with any system), quality is improved by striving for tight tolerances of stringent metrics of accuracy. For 5 cases, passing rates for 3%/3mm gamma analysis were generated following the TG119 instructions. Subsequently, more stringent/sensitive criteria combined with advanced volumetric dose analysis were applied, and in each case significant systematic errors were clearly identified despite the high 3%/3mm passing rates. In 4 of 5 cases, the error was easily remedied. These real-world examples of observed "false negatives" (insensitivities) point towards the inappropriateness of the 3%/3mm gamma passing rate metric as the basis for acceptance testing/commissioning of the IMRT/VMAT delivery chain. |
| Keywords: | three dimensional; physics; acceptance testing; delivery chain; dose analysis; false negatives; gamma analysis; pass rate; real-world; tight tolerances |
| Journal Title: | Journal of Physics: Conference Series |
| Volume: | 444 |
| Issue: | 1 |
| ISSN: | 1742-6588 |
| Publisher: | IOP Publishing Ltd |
| Date Published: | 2013-01-01 |
| Start Page: | 012086 |
| Language: | English |
| DOI: | 10.1088/1742-6596/444/1/012086 |
| PROVIDER: | scopus |
| DOI/URL: | |
| Notes: | --- - "Conference code: 99145" - "Export Date: 1 October 2013" - "Sponsors: Elekta; ScandiDos; Varian; NSW Ministry of Health" - "Source: Scopus" |
