Wolfgang Lechner
Medical University of Vienna
DosimeterQuality assuranceIrradiationOpticsPhysicsPhotonBeam (structure)Ionizing radiationField (physics)Materials scienceMedical physicsIonizationAuditRadiation treatment planningBragg peakPhoton beamsPareto optimalNuclear medicineTreatment planSmall fieldFlattening filter freeMathematicsRadiation therapyProtonDose profileMedicineDosimetryDetectorCathode ray
36Publications
9H-index
331Citations
Publications 35
Newest
#1Sinan Irmak (Medical University of Vienna)H-Index: 1
#2Lukas Zimmermann (University of Applied Sciences Wiener Neustadt)H-Index: 1
Last. Wolfgang Lechner (Medical University of Vienna)H-Index: 9
view all 5 authors...
PURPOSE In the past years, many different neural network-based conversion techniques for synthesising CTs (sCTs) from MR images have been published. While the model's performance can be checked during the training against the test set, test datasets can never represent the whole population. Conversion errors can still occur for special cases, e.g. for unusual anatomical situations. Therefore, the performance of sCT conversion needs to be verified on a patient specific level, especially in the ab...
Source
#1Maria Laggner (Medical University of Vienna)H-Index: 9
#2Alfred Gugerell (Medical University of Vienna)H-Index: 15
Last. Hendrik Jan Ankersmit (Medical University of Vienna)H-Index: 33
view all 16 authors...
Abstract Cell-free secretomes represent a promising new therapeutic avenue in regenerative medicine and γ-irradiation of human peripheral blood mononuclear cells (PBMCs) has been shown to promote the release of paracrine factors with high regenerative potential. Recently, the use of alternative irradiation sources, such as artificially generated β- or electron-irradiation, is encouraged by authorities. Since the effect of the less hazardous electron-radiation on the production and functions of p...
Source
#2L. FettyH-Index: 6
Last. Wolfgang LechnerH-Index: 9
view all 8 authors...
Source
#1Sinan Irmak (Medical University of Vienna)H-Index: 1
#2Dietmar Georg (Medical University of Vienna)H-Index: 60
Last. Wolfgang Lechner (Medical University of Vienna)H-Index: 9
view all 3 authors...
Abstract The purpose of this study was to compare different methods of CBCT conversion respect to dose calculation accuracy. Twelve head and neck cancer patients treated with VMAT using simultaneous integrated boost technique were selected for the study. For each patient a planning CT (pCT), a control. CT acquired in the fourth week of treatment and a CBCT scan acquired on the closest day with the control CT were used. In order to re-calculate dose directly on CBCT image sets, a population based...
Source
#1Wolfgang Lechner (Medical University of Vienna)H-Index: 9
#2Alexander Primeßnig (Medical University of Vienna)H-Index: 1
Last. Dietmar Georg (Medical University of Vienna)H-Index: 60
view all 6 authors...
AbstractBackground: Dosimetric effects of inaccuracies of output factors (OFs) implemented in treatment planning systems (TPSs) were investigated.Materials and methods: Modified beam models (MBM) f...
Source
#1Wolfgang LechnerH-Index: 9
#2Dietmar GeorgH-Index: 60
Last. Hugo Palmans (National Physical Laboratory)H-Index: 32
view all 3 authors...
PURPOSE: To present an analytical formalism for the in depth assessment of uncertainties of field output factors in small fields related to detector positioning based on dose profile measurements. Additionally, a procedure for the propagation of these uncertainties was developed. METHODS: Based on the assumption that one dimensional and two dimensional second-order polynomial functions can be fitted to dose profiles of small photon beams, equations for the calculation of the expectation value, t...
Source
#1Pavel Kazantsev (IAEA: International Atomic Energy Agency)H-Index: 4
#2Wolfgang Lechner (Medical University of Vienna)H-Index: 9
Last. Joanna Izewska (IAEA: International Atomic Energy Agency)H-Index: 18
view all 12 authors...
AbstractBackground: The IAEA has developed and tested an on-site, end-to-end IMRT/VMAT dosimetry audit methodology for head and neck cases using an anthropomorphic phantom. The audit methodology is...
Source
#1Muzafar Khan (Medical University of Vienna)H-Index: 2
#2G. Heilemann (Medical University of Vienna)H-Index: 7
Last. Andreas Berg (Medical University of Vienna)H-Index: 11
view all 5 authors...
The photon induced radical-initiated polymerization in polymer gels can be used for high-resolution tissue equivalent dosimeters in quality control of radiation therapy. The dose (D) distribution in radiation therapy can be measured as a change of the physical measurement parameter T2 using T2-weighted magnetic resonance imaging. The detection by T2 is relying on the local change of the molecular mobility due to local polymerization initiated by radicals generated by the ionizing radiation. The ...
Source
#1Peter KuessH-Index: 12
#2T. T. BohlenH-Index: 15
Last. Hugo PalmansH-Index: 32
view all 6 authors...
Shen (2019) commented on our paper 'Lateral response heterogeneity of Bragg peak ionization chambers for narrow-beam photon and proton dosimetry' regarding the impact of the low dose tail of the collimated x-ray beam we used to acquire individual response maps of large area ionization chambers. The behavior of this low dose tail was measured and compared to the simulations performed by Shen (2019). It was shown that the model of the tail by Shen (2019) is simplistic and overestimates its effect.
Source
#1Paulina Wesolowska (IAEA: International Atomic Energy Agency)H-Index: 6
#2Dietmar Georg (Medical University of Vienna)H-Index: 60
Last. Joanna Izewska (IAEA: International Atomic Energy Agency)H-Index: 18
view all 26 authors...
AbstractIntroduction: Within an International Atomic Energy Agency (IAEA) co-ordinated research project (CRP), a remote end-to-end dosimetric quality audit for intensity modulated radiation therapy...
Source
This website uses cookies.
We use cookies to improve your online experience. By continuing to use our website we assume you agree to the placement of these cookies.
To learn more, you can find in our Privacy Policy.