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Dosimetry
•
In
interstitial implants
, CT scan slices with
dummy sources and radio-opaque markers in the
edges of the CTV .
•
optimized dosimetry adjusting isodose curves to the
CTV
•
Avoid hot spots (Keep the Dose-nonuniformity-ratio
DNR <0.35)
•
With parallel tubes or needles the modified Paris
System (SSDS van der Laarse) is used and the
prescription is to 90% isodose.