Pius-Hospital and Carl-von-Ossietzky University Oldenburg, Germany

Pius-Hospital Oldenburg, Entrance View
Pius-Hospital Oldenburg, Entrance View
Carl-von-Ossietzky University Oldenburg
Carl-von-Ossietzky University Oldenburg

Working Group Medical Radiation Physics
Prof. Dr. Björn Poppe


The Working Group Medical Radiation Physics (www.uni-oldenburg.de/medical-radiation-physics) is part of the Faculty of Medicine and Health Sciences of the University of Oldenburg and essential contributor to the European Medical School Oldenburg-Groningen. (https://www.uni-oldenburg.de/european-medical-school).

The offices and accelerators are located on the Medical Campus of Pius-Hospital. Therefore the research environment is strongly influenced by questions regarding the applicability in clinical practice combined with physical background and scientific exactness.

Cooperation with PTW was intensified in 2001 when the group joined the project for the development of the 2D-ARRAY seven29. Several applications such as IMRT plan verification and quality assurance routines have been introduced since then. In addition, international training sessions for 2D-ARRAY seven29 users are held twice per year in Oldenburg and abroad too if desired (>> THE DOSIMETRY SCHOOL). 

PTW's DAVID system for in-vivo verification of conformal and intensity modulated radiation fields is being developed in collaboration with the group. The DAVID system was awarded the innovation price of the German Society for Radiation Oncology (DEGRO) in 2006.

In addition, new detector types and measuring systems such as point detectors for dose measurements with high spatial resolution or the OCTAVIUS 1000 SRS system for stereotactic measurements are regularly evaluated for clinical applicability in Oldenburg.

Moreover sophisticated signal processing methods for dosimetry such as the characterisation and deconvolution of the volume related low-passband effects and spectral dependent correction factors are developed in Oldenburg and partly integrated into PTW software such as MEPHYSTO or VeriSoft

Comprehensive PTW measuring and quality control equipment is also used in our routine work in medical physics.


Latest Publications:

B. Poppe, T.S. Stelljes, H.K. Looe, N. Chofor, D. Harder, K. Willborn.
Performance parameters of a liquid filled ionization chamber array Med. Phys. 40, 082106 (2013)

H. K. Looe, T. S. Stelljes, S. Foschepoth, D. Harder, K. Willborn, B. Poppe.
The dose response functions of ionization chambers in photon dosimetry - Gaussian or non-Gaussian?  Z. Med. Phys. Volume 23, Issue 2, May 2013, Pages 129?143

N. Chofor, D. Harder, B. Poppe.
Supplementary values of the dosimetric parameters kNR and Em for various types of detectors in 6 and 15 MV photon fields accepted, Z Med Phys. 2014 Mar;24(1):27-37

G. Heilemann, B. Poppe, W. Laub.
On the sensitivity of common Gamma-index evaluation methods to MLC misalignments in Rapidarc quality assurance Med. Phys. 40 (2013) 

N. Chofor, D. Harder, and B. Poppe.
Non-reference condition correction factor kNR of typical radiation detectors applied for the dosimetry of high-energy photon fields in radiotherapy Z. Med. Phys. 22, 181 - 196 (2012)

H.K. Looe, D. Harder, B. Poppe.
Experimental determination of the effective point of measurement for various detectors used in photon and electron beam dosimetry. Phys Med Biol 56,4267:4290 (2011) 

B. Poppe, H.K. Looe, N. Chofor, A. Rühmann, D. Harder, K. C. Willborn.
Clinical Performance of a Transmission Detector Array for the Permanent Supervision of IMRT Deliveries Radiotherapy and Oncology Volume 95(2): 158-165 (2010) 

H. K. Looe, D. Harder, A. Rühmann, K. C. Willborn, B. Poppe,
Enhanced accuracy of the permanent surveillance of IMRT deliveries by iterative deconvolution correction of DAVID chamber signal profiles,
accepted by Phys. Med. Biol (2010)

B. Poppe, H.K. Looe, N. Chofor, A. Rühmann
Clinical Performance of the DAVID System, a Transmission Detector Array for the Permanent Supervision of IMRT Deliveries,
accepted by Radiotherapy and Oncology (2010)

A. Djouguela, I. Griessbach, D. Harder, R. Kollhoff, N. Chofor, A. Rühmann, K. Willborn, B. Poppe,
Dosimetric characteristics of an unshielded p-type si-diode: linearity, photon energy dependence and spatial resolution applications of the unshielded Si diode PTW 60012,
Z. Med. Phys. 18 (2008) 301-306

B. Poppe, A. Djouguela, A. Blechschmidt, K. C. Willborn, A. Rühmann and D. Harder
Spatial resolution of 2D ionization chamber arrays for IMRT dose verification: single detector size and sampling step width
Phys. Med. Biol. 52 (2007) 2921-2935

B. Poppe, C. Thieke, D. Beyer, R. Kollhoff, A. Djouguela, A. Rühmann, K. C. Willborn, D. Harder
DAVID - A translucent multi-wire transmission ionization chamber for in-vivo verification of IMRT and conformal irradiation techniques
Phys. Med. Biol. 51 (2006) 1237-1248

A. Djouguela, R. Kollhoff, A. Rühmann, K. C. Willborn, D. Harder, B. Poppe
The dose-area product, a new parameter for the dosimetry of narrow photon beams
Z. Med. Phys. 16 (2006) 217-227

B. Poppe, A. Blechschmidt, A. Djouguela, R. Kollhoff, A. Rubach, D. Harder
Two-dimensional ionization chamber arrays for IMRT plan verification
Med. Phys. 33 (2006) 1005-1015

Contact address:

Prof. Dr. Björn Poppe
WG Medical Radiation Physics
Pius-Hospital and Carl-von-Ossietzky University
Georgstr. 12
26121 Oldenburg, Germany

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