Modern Bt Techniques - Florence 2016

Quality Parameters and Indices

Implant Volume based - Natural Dose Volume Histogram based Indices • Uniformity Index UI • Quality Index QI • Natural Dose Ratio NDR

“Natural” Dose Volume Histograms are calculated by most TPSs Histograms can be inspected for their appearance

Indices are derived and shown based on these NDVHs

Anderson LL Med Phys 13 (6); 898-903, 1986 Van der Laarse R, Prins TPE Nucletron International ; 352–372, 1994.