%0 Journal Article
%A Schwahofer, Andrea
%A Mann, P.
%A Spindeldreier, C. K.
%A Karger, C. P.
%T On the feasibility of absolute 3D dosimetry using LiF thermoluminescence detectors and polymer gels on a 0.35T MR-LINAC.
%J Physics in medicine and biology
%V 65
%N 21
%@ 1361-6560
%C Bristol
%I IOP Publ.
%M DKFZ-2020-02301
%P 215002
%D 2020
%Z #EA:E040#LA:E040#
%X As shown in our previous study, highly accurate absolute dosimetry in 3D is feasible by combining polymer gels (PG) with thermoluminescence dosimetry (TLD). In this setup, the thermoluminescence (TL)-based point dose information is used to renormalize the PG. This new PG-TLD reference system is now extended to measurements in magnetic fields.Experiments were carried out on a conventional 6 MV linear accelerator (LINAC) and a 6 MV 0.35 T magnetic resonance (MR)-LINAC. Signal stability of TLD600 and TLD700 was examined without and with magnetic field. Afterwards, the combination of PAGAT PG and TL detectors was employed within a cylindrical phantom in presence of the magnetic field. Two scenarios were tested: (I) an air-filled phantom and (II) a water-filled phantom. For each scenario, two plans were irradiated: (a) opposed beams with a field size of 10 × 10 cm2 and (b) a 3D conformal plan assuring homogeneous target coverage using three equally distributed coplanar beams.Mean relative uncertainty of TL calibration reproducibility for TLD600/TLD700 was 0.49
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:33104524
%R 10.1088/1361-6560/aba6d7
%U https://inrepo02.dkfz.de/record/164172