Program Information
Why Gamma Isn't Enough: Revisiting Our Criteria and Interpretation of IMRT QA Results
D Low1*, J O'Daniel2*, (1) UCLA, Los Angeles, CA, (2) Duke University Medical Center, Durham, NC
Presentations
SA-D-BRD-0 (Saturday, March 5, 2016) 4:30 PM - 5:30 PM Room: Grand Ballroom D
Gamma analysis has been an extensively used tool for dose distribution comparisons, most often employed for pre-treatment patient specific quality assurance analysis. For convenience, dose distribution pass/fail comparisons have relied on the gamma failure rate, which has been shown to be insensitive to many clinically relevant dose delivery uncertainties. In this session, the gamma analysis tool will be discussed to show what it can and cannot do. A road map and hints will be discussed to go from where we are now to a practical tool or tools that can take the place of Gamma failure rate analysis. Other patient specific QA analysis tools will be discussed including 3-dimensional DVH analysis and multi-planar analysis.
Learning objectives:
1.To learn and be able to define what Gamma analysis is and what it is not.
2.To understand the situations when Gamma analyses may not be sensitive enough to catch clinically relevant dose delivery errors.
3.To understand when Gamma analysis might be insufficiently sensitive and when this is acceptable and not acceptable.
4.To learn about other analysis tools that can be used that might be appropriate replacements for Gamma analysis.
Handouts
- 113-31155-379492-117883-334353011.pdf (J O'Daniel)
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