Automated and fast machine and delivery log-file based QA

Host: Cosylab, Slovenia.

Planned secondments: PSI (Switzerland), Oncoray (Germany).

Project description

Quality assurance (QA) is an essential part of radiotherapy workflow. It ensures that the machine – from accelerator to nozzle – acts according to specifications and the treatment planning system correctly predicted the dose distribution.

The standard QA procedure usually involves shooting each treatment beam in a phantom or a water tank that is filled with measuring equipment. The measurements are then compared to simulations and any discrepancies are investigated. The whole procedure is time consuming and occupies a valuable beam time and time from clinical personnel.

In recent years log-based QA has emerged as an alternative to standard QA procedures. The idea is instead of measuring actual dose distribution, machine files from irradiation are analyzed. The analysis should determine if there are any deviation from expected values.

While the log-based QA has already been developed and implemented clinically there are several areas that need further research and investigation. In scope of adaptive PT and hence RAPTOR project we would like to determine how the log-file analysis can guide adaptation of the treatment plan. Is the information accurate enough to adapt the treatment plan or are there further modifications necessary?

On one hand we need to investigate fast and robust algorithms for log-based QA that can be implemented in almost any PT clinic. On the other hand, we want to see how to exploit this data even further and assist in adapting the treatment plan according to daily patient anatomy and machine specifics.

The PhD student will be employed at Cosylab under the supervision of Dr Kristjan Anderle and will be registered to the PhD program at the faculty of Mathematics and Physics of the University of Liubjana (UL).  COSYLAB is the global leader in control system integration for proton therapy and Big Physics machines: particle and nuclear accelerators and other large facilities such as tokamaks and radio telescopes. UL is the largest university of Slovenia and hosts multiple faculties dedicated to research and study areas.

For more information concerning the research project please contact: Kristjan Anderle

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Cosylab d.d.


Cosylab (Cosylab Control System Laboratory d.d.) is a global technology company that builds and integrates state-of-the-art software and electronics for the world’s most complex, precise and advanced systems. It enables research organizations to discover scientific breakthroughs, hospitals to deliver better cancer treatment and organizations to improve their performance.