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Quantification of dose homogeneity in brachytherapy
V
ref
V
1.5xref
V
1.5xref
DNR =
V
ref
DNR is specific to the implant geometry and prescription isodose
The dose distribution is optimal when the
DNR is minimal
,
DHI is maximal
V
ref
= volume receiving equal to or
greater than the reference dose
V
1.5xref
= volume receiving equal to or greater
than 1.5 x the reference dose
Dose homogeneity index (DHI) for implant
Dose homogeneity index (DHI) for target
DNR
V
V V DHI
100
150
100
−=
−
=
1
V100
V150
V100
DHI
−
=