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3. real sources
Input must now be source specific:
•
Energy distribution of primary fluence
(in essence the source phase space file)
Acuros uses effective sources:
pre-calculated source specific phase
space file
+
a number of points within the source
volume for ray tracing the primary
fluence in the geometry
Brachy sources are small BUT
the number of point sources used
for ray tracing can be important
Figure from: L. Petrokokkinos et al. Med. Phys. 38 1981 (2011)