Real-world examples of sensitivity failures of the 3%/3mm pass rate metric and published action levels when used in IMRT/VMAT system commissioning
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 combine...
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| Veröffentlicht in: | Journal of physics. Conference series 2013-01, Vol.444 (1), p.12086-5 |
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| container_title | Journal of physics. Conference series |
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| creator | Nelms, B Jarry, G Chan, M Hampton, C Watanabe, Y Feygelman, V |
| description | 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. |
| doi_str_mv | 10.1088/1742-6596/444/1/012086 |
| format | Article |
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| subjects | Acceptance Acceptance tests Chains Commissioning Criteria Errors Failure Physics Systematic errors Tolerances |
| 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 |
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