Dose Course 2018_Flipping book

Zhen et al

• Found: – 3%/3mm showed no correlation that indicates DVH errors decrease with increasing gamma pass rates – Significant number of False Negatives (Gamma>95% but DVH errors>5%) – Correlation increases as reduce %/mm (though still weak) – Inverse correlation found in some cases (DVH errors larger for higher pass rates) • Concluded: – Gamma pass rates don’t correlate to clinically relevant DVH metrics – Action levels presume a strong correlation – DVH based metrics? Vs ‘simple’ gamma metric?

Dublin 2018