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Intra-operative planning:
1) Contouring for Pre-planning
2) Real time planning
Contouring:
Every 3-5 mm for contouring
From the base to the apex with a 3 mm
margin (not posteriorly)
To justify the 3mm margin:
PARTIN tables: 10% extracapsular penetration
Studies by Davis BJ (Cancer 1999),
the 96% extracapsular extension ≤ 3mm in patients with good
prognosis
GTV
is usually not considered (may be defined using the information from previous
diagnostic images.
CTV
: Volume that contains GTV and includes all sublinical malignant diseases at a
certain probability level: Prostate + 3mm.
CTV= PTV
: Prostate + 3 mm.
T3: CTV corresponds to the visible contour of the prostate including visible extension
due to extracapsular growth + 3mm.