657 / 1138
ESTRO SBRT course Sept 2015
22
Recently… New identical Linac…
Why did QART fail?
•
The institution stated to use another HD MLC model. Looking back at all
the data, a systematic deviation could be detected. ( this is a strong
argument for statistical proces analysis, SPC!)
•
An RPC audit had been conducted. However, the MU’s needed were based
on the measurements, not on the TPS calculation. (not mandatory for RPC
check).
Lessons:
- Even in an institution with a lot of RTQA incidents can happen.
- It is not sufficient to look at all steps separately, take an integral look at
things.
- Very detailed knowledge is required to implement the right RTQA
procedures AND people should stricktly adhere to it.