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Optimization volume:
o Homogen
o Homogen = Homogen cropped with 1 cm to PTV-N(#).
Purpose:
To avoid dose higher than 103% of 45Gy
.
PTV-N(#)
Homogen
o Homogen
Especially around bladder, rectum
and sigmoid hot area should be
avoided, because in the homogen
area brachy dose is added to the
external beam dose.
Courtesy :
Marianne S Assenholt