781 / 1245
Pinnacle by Philips
Primary transport for a beam is accomplished by projecting the incident
energy fluence through the density representation of a patient to compute a
TERMA (Total Energy Released per unit Mass) volume using poly-energetic
rays, with water equivalent depth hardening and off-axis softening.
o
Transport in water
A three-dimensional superposition of the TERMA with a poly-energetic
energy deposition kernel is used to compute dose. A ray-tracing technique is
used during the superposition to incorporate the effects of heterogeneities
on lateral scatter.
o
To account for heterogeneities, the kernels are density-scaled during
superposition. Superposition is performed using “collapsed cones.”
o
Deposit in water
No mention of medium in the manual, thus;
April 2017
25
,