Zobrazeno 1 - 10
of 15
pro vyhledávání: '"Kay Willborn"'
Internal scatter, the unavoidable major component of the peripheral dose in photon-beam radiotherapy
Publikováno v:
Physics in Medicine and Biology. 57:1733-1743
In clinical photon beams, the dose outside the geometrical field limits is produced by photons originating from (i) head leakage, (ii) scattering at the beam collimators and the flattening filter (head scatter) and (iii) scattering from the directly
Autor:
Ralf-Peter Kapsch, N Chofor, Kay Willborn, A. Rühmann, Björn Poppe, Dietrich Harder, Hui Khee Looe, Ralf Kollhoff
Publikováno v:
Zeitschrift für Medizinische Physik. 19:252-263
In photon-beam radiotherapy, the absorbed dose in an irradiated object contains a contribution by energy-degraded photons originating from Compton scatter processes at parts of the treatment head and within the absorber itself. These low-energy spect
Autor:
A. Rühmann, Wolfgang Kunth, Björn Poppe, Kay Willborn, Armand Djouguela, N Chofor, Ralf Kollhoff
Publikováno v:
Strahlentherapie und Onkologie. 183:43-48
To investigate the attenuation of a carbon-fiber tabletop and a combiboard, alongside with the depth-dose profile in a solid-water phantom.Depth-dose measurements were performed with a Roos chamber for 6- and 10-MV beams for a typical field size (15
Publikováno v:
Zeitschrift fur medizinische Physik. 21(3)
The varying low-energy contribution to the photon spectra at points within and around radiotherapy photon fields is associated with variations in the responses of non-water equivalent dosimeters and in the water-to-material dose conversion factors fo
Publikováno v:
Physics in medicine and biology. 55(14)
In vivo dosimetry systems, capable of permanently monitoring IMRT treatment deliveries throughout all fractions, are increasingly used in clinical practice. The first of these solutions is the DAVID system, a translucent multiwire ionization chamber
Publikováno v:
IFMBE Proceedings ISBN: 9783642034725
This investigation deals with an experimental method of identifying the presence of a low-energy component in the total photon spectrum inside an absorber irradiated by a high-energy photon beam. This is the so-called “twinchamber” method, in whi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::df7833e37164998fd748594b465a6a4b
https://doi.org/10.1007/978-3-642-03474-9_147
https://doi.org/10.1007/978-3-642-03474-9_147
Publikováno v:
IFMBE Proceedings ISBN: 9783642034725
A successful method for the mathematical description of the lateral dose profiles of narrow photon beams for IMRT treatment is herewith presented. Based on the measurement of dose profiles in homogeneous water equivalent absorbers and on their analys
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8a529cf836e053668b4f7aeb5cd943b8
https://doi.org/10.1007/978-3-642-03474-9_75
https://doi.org/10.1007/978-3-642-03474-9_75
Publikováno v:
IFMBE Proceedings ISBN: 9783642034725
The new SIEMENS MLC160 offers the application of intensity modulated techniques and stereotactic treatements within the whole 40 cm x 40 cm irradiation field. In this work we analyzed dose profiles of small off-axis fields. Larger deviations from sym
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5a7e8448342667b960bf9d5aee5a0905
https://doi.org/10.1007/978-3-642-03474-9_71
https://doi.org/10.1007/978-3-642-03474-9_71
Autor:
N Chofor, Björn Poppe, Dietrich Harder, A. Rühmann, Ralf-Peter Kapsch, Hui Khee Looe, Kay Willborn
Publikováno v:
Physics in medicine and biology. 52(7)
In this work we present a new parameter for characterizing the emitted photon spectra of (60)Co radiotherapy units. It is intended to propose this parameter for the revised DIN standard 6809-1. In the previous DIN regulation, it had been sufficient t
Publikováno v:
Zeitschrift fur medizinische Physik. 16(3)
In the dosimetry of narrow photon fields with side lengths of the order of 1 cm, the traditional parametrisation via the absolute dose on the beam axis and the relative lateral dose distribution has to deal with the difficulty to find sufficiently sm