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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.
QUALITY INDEX (QI)
QI is similar to UI, but instead
of the treatment dose (TD) the
low dose (LD) is used.
It is independent on the
prescribed dose
The Quality Index QI is
defined to suppress the
influence of the chosen
reference dose
Natural Dose Volume Histogram
VOLUMETRIC HOMOGENEITY PARAMETERS