Porträt Prof. Dr. Troost, Esther Gera Cornelia; FWMO

Prof. Dr. Esther Gera Cornelia Troost

Head Image-guided Radiooncology
Phone: +49 351 458 2394





Weitere Informationen

Patients and physicians may contact the University Proton Therapy Dresden hotline at 0351 458 15693 (Monday to Friday from 9am to 11am and 1pm to 3pm) or via via e-mail:


Image Guided High Precision Radiotherapy

Group leader: Prof. Dr. Esther Troost


Computed tomography (CT), magnetic resonance imaging (MRI) and positron-emission-tomography (PET) are different imaging modalities to visualize anatomic, structural and metabolic changes. Foto: OncoRay

The research group focuses on thorough analysis and subsequent clinical implementation of 3D- and 4D-imaging techniques for high-precision radiotherapy of moving targets, e.g., pancreatic tumors. It furthermore explores suitable markers for reliable tumor localization during the course of fractionated radiation. This applies to both photon and proton beam treatment.

Behandlungsplan Protonen Bauchspeicheldrüse

Proton beam treatment plan of a patient with an adenocarcinoma of the pancreas. Using gold markers (blue circles) the delineated target area can be positioned exactly prior to treatment. Foto: OncoRay

3D- and 4D- imaging / new markers for positioning

Based on the imaging obtained in the diagnostic phase or for radiation planning purposes, the group aims at identifying new prognostic or predictive markers enabling the delivery of tailored treatment, increasing tumor control while maintaining or even reducing the normal tissue complication probability.

Tumors of the head and neck barely move. But many other tumors in the body, i.e. tumors of the lung, liver or pancreas, do move due to the continuous heart beat, breathing and because of the gastrointestinal filling in the abdominal area. To offer accurate radiation in such cases, it is necessary to take into account the movement of the tumor and the surrounding organs. This is called four-dimensional (4D-) radiation treatment planning.

The group focuses on 3D- and 4D- imaging techniques for high precision radiation therapy in (moving) tumors. Innovative combination therapies will be tested in clinical trials.

In addition the researchers explore innovative markers for the radiation with photons and protons. These are needed to precisely define the position of the tumors in consecutive radiation sessions. One example for this are extremely thin gold fibers and gel markers, which are implanted to the tumor margins and which can be detected by X-ray (incl. CT) and MRI.

Individualized Treatment

With (CT-)imaging facilities being available in the treatment room, dose-guided instead of image-guided radiotherapy comes within reach and will be assessed in collaboration with other groups at OncoRay. Finally, the patients’ choices will be taken aboard when designing complex (IMRT/VMAT) treatment plans with numerous degrees of freedom. By doing so, the level of regret experienced through undesired side-effects is likely to decrease, improving the patients’ quality of life.

In spite of the sensitivity of the available imaging techniques finest offshoots of the tumor margins cannot be detected. To be able to apply sufficient doses of radiation also to these areas, generous safety margins are included. To meet the actual challenges of the adaptive photon and proton therapy, we initiated research projects targeting exactly these issues. The research group is working on developing methods to predict the tumor translations precisely and individually for each patient.

Besides the clinical research - in close cooperation between OncoRay and the Department of Radiation Therapy and Radiooncology of the University Hospital Carl Gustav Carus - newest therapies are being developed and tested within clinical studies (DKTK-project PARADIGM, Horizon 2020 project IMMUNOSABR, IIT RadioCoBrim). For this we are part of a strong network with national and international partners: