Zobrazeno 1 - 10
of 19
pro vyhledávání: '"Jana Kretschmer"'
Autor:
Fabian Kugel, Jörg Wulff, Christian Bäumer, Martin Janson, Jana Kretschmer, Leonie Brodbek, Carina Behrends, Nico Verbeek, Hui Khee Looe, Björn Poppe, Beate Timmermann
Publikováno v:
Zeitschrift für Medizinische Physik, Vol 33, Iss 4, Pp 529-541 (2023)
Purpose: The primary fluence of a proton pencil beam exiting the accelerator is enveloped by a region of secondaries, commonly called “spray”. Although small in magnitude, this spray may affect dose distributions in pencil beam scanning mode e.g.
Externí odkaz:
https://doaj.org/article/cc5c1c5288d94284b0365f902555700d
Autor:
Jana Kretschmer, Leonie Brodbek, Carina Behrends, Fabian Kugel, Benjamin Koska, Christian Bäumer, Jörg Wulff, Beate Timmermann, Björn Poppe, Hui Khee Looe
Background and purpose: As a part of the commissioning and quality assurance in proton beam therapy, lateral dose profiles and output factors have to be acquired. Such measurements can be performed with point detectors and are especially challenging
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e0edbda7ad7c149ba2863b8d4e0e3474
https://www.ncbi.nlm.nih.gov/pubmed/36908165
https://www.ncbi.nlm.nih.gov/pubmed/36908165
Autor:
Jana Kretschmer, Leonie Brodbek, Hui Khee Looe, Emiel van der Graaf, Marc Jan van Goethem, Harry Kiewiet, Francesco Olivari, Christoph Meyer, Björn Poppe, Sytze Brandenburg
Publikováno v:
Physics in Medicine and Biology, 67(14):145003. IOP PUBLISHING LTD
Objective. Point detector measurements in proton fields are perturbed by the volume effect originating from geometrical volume-averaging within the extended detector’s sensitive volume and density perturbations by non-water equivalent detector comp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::622c41081434e5b2657d98d43b674fc6
https://research.rug.nl/en/publications/5926ffcc-2a88-4d32-84e9-fbfe319eef08
https://research.rug.nl/en/publications/5926ffcc-2a88-4d32-84e9-fbfe319eef08
Publikováno v:
Medical Physics, 47(11), 5890-5905. Wiley
PURPOSE: Beam quality correction factors provided in current codes of practice for proton beams are approximated using the water-to-air mass stopping power ratio and by assuming the proton beam quality related perturbation correction factors to be un
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::db91d0a3a96ef744b2421b07f7e956c9
https://doi.org/10.1002/mp.14499
https://doi.org/10.1002/mp.14499
Autor:
Jana Kretschmer, Hui Khee Looe, Daniela Poppinga, Leonie Brodbek, Bjoern Poppe, Jutta Meyners
Publikováno v:
Journal of Applied Clinical Medical Physics
Journal of applied clinical medical physics, 21(10), 69-79. Wiley
Journal of applied clinical medical physics, 21(10), 69-79. Wiley
Purpose This study evaluates the clinical use of the RUBY modular QA phantom for linac QA to validate the integrity of IGRT workflows including the congruence of machine isocenter, imaging isocenter, and room lasers. The results have been benchmarked
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2096874e7de8b08eecf169092055f9d8
http://europepmc.org/articles/PMC7592965
http://europepmc.org/articles/PMC7592965
Autor:
Daniela Poppinga, Hui Khee Looe, Katrin Büsing, Leonie Brodbek, Bjoern Poppe, Jana Kretschmer
Publikováno v:
Biomedical Physics and Engineering Express, 8(1):015018. IOP PUBLISHING LTD
The RUBY head phantom in combination with the System QA insert MultiMet can be used for simultaneous point dose measurements at an isocentric and two off-axis positions. This study investigates the suitability of the system for systematic integral en
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aa9990e382638bc9723deffe9176d4a8
https://doi.org/10.1088/2057-1976/ac3e37
https://doi.org/10.1088/2057-1976/ac3e37
Autor:
Jana Kretschmer, Leonie Brodbek, T. S. Stelljes, Björn Poppe, Hui Khee Looe, Daniela Poppinga
Publikováno v:
Medical Physics. 46:1863-1873
Purpose The collimator monitoring fill factor (CM-FF) introduced by Stelljes et al. (2017) and the FWHM fill factor (FWHM-FF) introduced by Gago-Arias et al. (2012) were determined using the measured photon fluence response functions of various 2D-ar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9454475f906fa71587f0249a2f89371e
https://doi.org/10.1002/mp.13417
https://doi.org/10.1002/mp.13417
Publikováno v:
Planetary and Space Science. 143:21-27
Using new data and recent models this paper derives a total combined flux model of the mass reaching Earth as interplanetary material. For the small sizes the interplanetary flux model by Grun et al. (1985) was used which describes the mass flux at 1
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::77d813bc628620ae13319794b38315ad
https://doi.org/10.1016/j.pss.2016.12.010
https://doi.org/10.1016/j.pss.2016.12.010
Autor:
S. Drolshagen, Theresa Ott, Esther Drolshagen, Björn Poppe, Jana Kretschmer, Gerhard Drolshagen, Detlef Koschny
Publikováno v:
Planetary and Space Science. 143:230-237
We have developed a new method to determine flux densities of meteoroids using optical double-station meteor observations. It is based on the assumption that the velocity distribution is constant for all mass bins. By comparing the observed velocity
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b2ffd2ec43aa5414b94cee1947a92bb1
https://doi.org/10.1016/j.pss.2016.12.007
https://doi.org/10.1016/j.pss.2016.12.007
Autor:
Johannes A. Langendijk, Antje-Christin Knopf, Jana Kretschmer, Leonie Brodbek, Arturs Meijers, Björn Poppe, Stefan Both, Kay Willborn, Hui Khee Looe
Publikováno v:
Medical Physics, 47(9), 4589-4601. Wiley
Purpose: The introduction of advanced treatment techniques in proton therapy, such as intensity-modulated proton therapy, leads to an increased need for patient-specific quality assurance, especially an accurate treatment plan verification becomes in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::00dd46f4324c30ea77aaf5daf5ff7be1
https://pubmed.ncbi.nlm.nih.gov/32574383
https://pubmed.ncbi.nlm.nih.gov/32574383