Imaging for early stage breast cancer

Quantification of dose homogeneity for PTV in IMRT

D

98%

Homogeneity index

D

50%

HI ≈ steepness of PTV curve

D

2%

low HI high HI

homogeneous dose distribution inhomogeneous dose distribution

Prescribing, Recording, and Reporting Photon-Beam Intensity-Modulated Radiation Therapy (IMRT), ICRU Report 83, 2010