Stefan G. Scheib

TL;DR: The new proton therapy facility is being assembled at the Paul Scherrer Institute (PSI) and the status of the facility and first experimental results are introduced for later reference.

TL;DR: The pencil beam dose model used for treatment planning at the PSI proton gantry, the only system presently applying proton therapy with a beam scanning technique, is presented, including the nuclear beam halo, which can predict quite precisely the dose directly from treatment planning without renormalization measurements.

TL;DR: A computer simulation of the dose deposition in the presence of respiratory motion was performed, finding that broad, Gaussian beams result in better dose uniformity than narrow, sharply delineated ones, but produce slower dose fall-off at the edges of the scanned volume.

TL;DR: The aim of this study was the experimental determination of the output factors for the field defining collimators used in Gamma Knife radiosurgery, in particular for the 4 mm collimator helmet, which is in good agreement with recently published results and demonstrates the feasibility of such measurements.

TL;DR: A GAFCHROMIC film based dosimetry system for measuring two-dimensional and three-dimensional dose distributions was developed and a double irradiation technique is introduced and implemented that yields dose accuracies as good as 2%-3%.