Proton Radiography for real-time Intensity Modulated Proton Therapy plan adaptation

Host: Cancer Research Center Groningen (CRCG) Research Institute of the UMCG, Netherlands.

Planned secondments: IBA(Belgium), ProtonVDA(USA), QST(Japan).

Project description

Proton therapy can achieve his full potential only when range uncertainty sources, such as the CT calibration curve, setup errors and anatomical changes are precisely managed. Exact knowledge of the relative stopping power (RSP) of the patient tissues is critical to accurately predict the proton range in treatment planning. However, in current clinical practice the SPR prediction is approximated from X-ray computed tomography (CT) and the associated uncertainties require significant safety margins. Proton radiography (PR) potentially may bypass this approximation by directly measuring the RSP, while also detecting patient setup and anatomical variations.

In this project, the researcher will study and develop methods to reduce the (multiple Coulomb scattering) MCS interference for quantitative analysis of PR images obtained by flat panel detectors.

Next, methods to interpret and analyze PR images by applying and extending Neural Network algorithms to reliably extract calibration curve and setup errors from PR images will be developed.

Finally, methods to merge proton and X-ray tomographic data in which PR is employed as a QA tool that provides means of in vivo range verification and ultimately validate CBCT based synthetic CTs to enable the study of real-time plan adaptation workflows will be investigated .

The successful candidate will be enrolled in the Cancer Research Center Groningen (CRCG) Research Institute of the UMCG, under the supervision of Prof. Stefan Both. The UMCG is one of the largest hospitals in the Netherlands. It is a non-profit educational and research organization and part of the University of Groningen (UG).

As part of the CRCG, the ESRs will be embedded in the department of Radiation Oncology, which has a strong track record in the development and validation of prediction models describing the relationship between complex 3D-dose distributions and the risk of radiation-induced side effects. Research activities related to photon as well as to proton therapy are accommodated within GRayLines, an integrated research program including technology development, imaging, clinical studies, radiobiology and HTA. As such, the UMCG provides an ideal environment to merge technological developments with basic, translational and clinical science, and transferable skills.

For more information concerning the research project please contact: Stefan Both.

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Academish Ziekenhuis Groningen


The UMCG is one of the largest academic hospitals in the Netherlands and the first to offer proton therapy. Innovative cancer treatment is one of our key research areas. In the field of Radiation Oncology we focus on high precision, innovation and healthy ageing of cancer survivors.