556-557 / 3581
Actual treatment beam used for imaging
Direct geometric alignment
Beam has been modeled in TPS and concomitant IGRT dose
Advantages of MV tomography IGRT
can
“easily”
be incorporated into dose calculation.
3D volumetric imaging, no surrogates required.
CT-CT registration, similar information
Registration of dose distribution and anatomy
possible
No high-Z artifacts
22
ESTRO IGRT 2008
MV-CT usable for dose calculation and dose
reconstruction