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The arrows shows the low dose LD and high dose HD
The LD and HD is used to define the QI and UI, respectively
Major T, Fröhlich G, Polgar C. Assessment of dose homogeneity in conformal interstitial breast brachytherapy
with special respect to ICRU recommendations. J Contemp Brachytherapy. 2011; 3(3):150–5.
UNIFORMITY INDEX (UI)
The narrower the peak, the
more uniform the dose
distribution is.
The UI depends on the
prescribed dose and high
dose HD, it can be used to
compare implants with the
same dose prescription only.
It expresses the amount of the
treatment volume which is
concentrated between the
prescription dose, PD, and the
high dose side of the peak,
HD.
Natural Dose Volume Histogram
VOLUMETRIC HOMOGENEITY PARAMETERS