Recently… New identical Linac…
Why did QART fail?
•
Full tests from CT scanning to irradiation of phantoms have
been performed. The measurements were performed on the
right linac.
But
the calculations were performed using the
existing Linac model in the TPS.
•
Routinely EPID patient dosimetry QA is performed at this
institution.
But
this is a relative measurement (scaled to
coincide with calculations in normalisation point).
Occasionally Matrix-measurements are performed at a linac,
e.g., if beams do not fit on the EPID.
But
on the new linac only
small fields were used. (HD 2.5 mm MLC)