[1] Katholieke Univ Leuven, Lab Expt Radiotherapy, Leuven, Belgium
[2] UZ Leuven, Radiat Oncol, Leuven, Belgium
[3] PTW Freiburg GmbH, PTW Benelux, Freiburg, Germany
[4] SCK CEN, Res Dosimetr Applicat Grp, Mol, Belgium
[5] UZ Leuven, Oncol Dept, Leuven, Belgium
[6] Agfa NV, Corp Innovat Off, Mortsel, Belgium