65 citations · 137 across the 16 of their papers we have counts for
14 papers · 1 filter
A mathematical approach to aspects of LET, micro- and nano-dosimetry in radiation therapy with photons and charged particles
Waldemar Ulmer
The radiation effects induced by Co60 serve as a reference system for the consideration of LET and RBE in normal and tumor tissue dose-effect relations are usually handled by the l…
Aspects of the physical principles of the proton therapy with inclusion of nuclear interactions
W. Ulmer, A. Carabe-Fernandez
The radiotherapy of malignant diseases has reached much progress during the past decade. Thus, intensity modulated radiation therapy (IMRT) and VMAT (Rapidarc) now belong to the st…
Characterization of specific nuclear reaction channels by deconvolution in the energy space of the total nuclear cross-section of protons - applications to proton therapy and technical problems (transmutations)
W. Ulmer
The total nuclear cross-section Qtot(E) resulting from the interaction of protons with nuclei is decomposed in 3 different contributions: 1. elastic scatter at the complete nucleus…
Quantum mechanical aspects of friction and electric resistance in microscopic problems with applications to radiation physics
W. Ulmer
Friction incorporates the close connection between classical mechanics in irreversible thermodynamics. The translation to a quantum mechanical foundation is not trivial and require…
A new calculation formula of the nuclear cross-section of therapeutic protons
W. Ulmer
We have previously developed for nuclear cross-sections of therapeutic protons a calculation model, which is founded on the collective model as well as a quantum mechanical many pa…
Convolution/deconvolution of generalized Gaussian kernels with applications to proton/photon physics and electron capture of charged particles
W. Ulmer
Scatter processes of photons lead to blurring of images produced by CT (computed tomography) or CBCT (cone beam computed tomography) in the KV domain or portal imaging in the MV do…
Radiobiological investigations at tumor cell lines by exploiting chrono-biological aspects of chronological dose distributions
W. Ulmer
Using 31P-NMR spectroscopy the chronological behavior of the ATP-metabolism of the tumor spheroids C3H-MA, 9L-Gliome and the mono-layer L1210 has been analyzed via decrease of the…
Theory of coupled electromagnetic circuits, the connection to quantum mechanical resonance interactions and relevance to chronobiology
W. Ulmer, G. Cornelissen, F. Halberg +1
The existence of specific biorhythms and the role of geomagnetic and/or solar magnetic activities are well-established by appropriate correlations in chronobiology. From a physical…
The role of electron capture and energy exchange of positively charged particles passing through matter
W. Ulmer
The conventional treatment of the Bethe-Bloch equation for protons accounts for electron capture at the end of the projectile track by the small Barkas correction. This is only a p…
Creation of high energy/intensity bremsstrahlung by a multitarget and focusing of the scattered electrons by small-angle backscatter at a cone wall and a magnetic field II - Enhancement of the outcome of linear accelerators in radiotherapy
W. Ulmer
The yield of bremsstrahlung from collisions of fast electrons (energy at least 6 MeV) with a Tungsten target can be significantly improved by exploitation of Tungsten wall scatter…
Laboratory Report (LR) to the paper Foundation of an analytical proton beamlet model for inclusion in a general proton dose calculation system [arXiv:1009.0832]
W. Ulmer, B. Schaffner
We have developed a model for proton depth dose and lateral distributions based on Monte Carlo calculations (GEANT4) and an integration procedure of the Bethe-Bloch equation (BBE).…
Foundation of an analytical proton beamlet model for inclusion in a general proton dose calculation system
W. Ulmer, B. Schaffner
We have developed a model for proton depth dose and lateral distributions based on Monte Carlo calculations (GEANT4) and an integration procedure of the Bethe-Bloch equation (BBE).…
A method for the determination of nuclear cross sections of proton beams by the collective model and extended nuclear-shell theory
W. Ulmer, E. Matsinos
A recapitulatory analysis of total nuclear cross sections of various nuclei is presented, which yields detailed knowledge on the different physical processes such as potential/reso…
Theoretical methods for the calculation of Bragg curves and 3D distributions of proton beams
Waldemar Ulmer, Evangelos Matsinos
The well-known Bragg-Kleeman rule RCSDA = A dot E0p has become a pioneer work in radiation physics of charged particles and is still a useful tool to estimate the range RCSDA of ap…