Zobrazeno 1 - 10
of 19
pro vyhledávání: '"Ralf Kollhoff"'
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:
Bjoern Poppe, Ralf Kollhoff, Irmgard Grießbach, Armand Djouguela, Dietrich Harder, N Chofor, Kay Willborn, A. Rühmann
Publikováno v:
Zeitschrift für Medizinische Physik. 18:301-306
The unshielded Si diode PTW 60012, used for accurate measurements of the transversal dose profiles of narrow photon beams, has been investigated with regard to its linearity, photon energy dependence and spatial resolution. The diode shows a slight s
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:
Physics in Medicine and Biology. 51:4345-4356
In consideration of the importance of film dosimetry for the dosimetric verification of IMRT treatment plans, the Schwarzschild effect or failure of the reciprocity law, i.e. the reduction of the net optical density under 'protraction' or 'fractionat
Autor:
A Rubach, Bjoern Poppe, Armand Djouguela, Ralf Kollhoff, Arne Blechschmidt, Kay Willborn, Dietrich Harder
Publikováno v:
Medical Physics. 33:1005-1015
In this paper we describe a concept for dosimetric treatment plan verification using two-dimensional ionization chamber arrays. Two different versions of the 2D-ARRAY (PTW-Freiburg, Germany) will be presented, a matrix of 16 x 16 chambers (chamber cr
Autor:
Zanzem Atung, Arne Blechschmidt, Dietrich Harder, Björn Poppe, A Rubach, George Chofor, Armand Djouguela, Ralf Kollhoff
Publikováno v:
Zeitschrift für Medizinische Physik. 15:287-291
The two-dimensional verification of intensity-modulated radiation plans is one of the major requirements for the safe application of this technique. The present study examines the resolution and sensitivity of a two-dimensional ionisation-chamber arr
Publikováno v:
Zeitschrift für Medizinische Physik. 13:115-122
Two-dimensional dosimetry measurements are an important tool of Quality Assurance in modern radiotherapy techniques, such as the Intensity Modulated Radiation Therapy (IMRT). Common procedures are usually based on the use of films or semiconductor ar
Autor:
Wolfgang Kunth, A. Rühmann, Kay Willborn, Ralf Kollhoff, Dietrich Harder, Armand Djouguela, Björn Poppe, Simon Foschepoth
Publikováno v:
Physics in medicine and biology. 54(9)
The two-dimensional lateral dose profiles D(x, y) of narrow photon beams, typically used for beamlet-based IMRT, stereotactic radiosurgery and tomotherapy, can be regarded as resulting from the convolution of a two-dimensional rectangular function R(
Autor:
N Chofor, A. Rühmann, Björn Poppe, Dietrich Harder, Kay Willborn, Wolfgang Kunth, Ralf Kollhoff, Hui Khee Looe
Publikováno v:
IFMBE Proceedings ISBN: 9783642034725
A complete IMRT QA program based on a combination of the 2D-ARRAY and the DAVID system was implemented in our clinic to verify all IMRT deliveries. The QA program covers the whole treatment process from pretreatment dosimetric plan verification to da
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d70fb70be5b527c5a4856b4dfba53e65
https://doi.org/10.1007/978-3-642-03474-9_114
https://doi.org/10.1007/978-3-642-03474-9_114
Publikováno v:
IFMBE Proceedings ISBN: 9783642034725
In this work we describe the introduction of the active breath gating system SpiroDyn’RX (SDX), Dyn’R, Muret Cedex, France, in our clinical facility.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::987f300bb9dd3cf8ab070a2e5b2be7e4
https://doi.org/10.1007/978-3-642-03474-9_211
https://doi.org/10.1007/978-3-642-03474-9_211