Zobrazeno 1 - 10
of 113
pro vyhledávání: '"Iwan Kawrakow"'
Autor:
Miguel A. Palacios, Georgi Gerganov, Paul Cobussen, Shyama U. Tetar, Tobias Finazzi, Berend J. Slotman, Suresh Senan, Cornelis J.A. Haasbeek, Iwan Kawrakow
Publikováno v:
Physics and Imaging in Radiation Oncology, Vol 26, Iss , Pp 100437- (2023)
Background and Purpose: Intra-fraction motion management is key in Stereotactic Ablative Radiotherapy (SABR) gated delivery. This study assessed the accuracy of automatic tumor segmentation in the delivery of MR-guided radiotherapy (MRgRT) by compari
Externí odkaz:
https://doaj.org/article/6c3f6cdf49964eee881060360ec4632d
Publikováno v:
Physics and Imaging in Radiation Oncology, Vol 5, Iss , Pp 26-30 (2018)
Background and purpose: Conversion factors between dose to medium (Dm,m) and dose to water (Dw,w) provided by treatment planning systems that model the patient as water with variable electron density are currently based on stopping power ratios. In t
Externí odkaz:
https://doaj.org/article/d7bebde1e74b4dcfba2f4432722f2b7a
Autor:
Iwan Kawrakow, Rowan M. Thomson
Publikováno v:
Physica Medica. 54:179-188
Purpose Classical trajectory Monte Carlo (MC) simulations modelling radiation-induced damage on subcellular length scales ignore quantum effects that may be non-negligible as electron energy decreases below 1 keV. This work investigates quantum mecha
Autor:
Parag J. Parikh, Yanle Hu, O. Wooten, Yuan Feng, D Du, Sasa Mutic, Iwan Kawrakow, Jeffrey R. Olsen, Camille Noel
Publikováno v:
Journal of Applied Clinical Medical Physics
On‐board magnetic resonance (MR) image guidance during radiation therapy offers the potential for more accurate treatment delivery. To utilize the real‐time image information, a crucial prerequisite is the ability to successfully segment and trac
Publikováno v:
Physics and Imaging in Radiation Oncology, 5
Physics and Imaging in Radiation Oncology, Vol 5, Iss, Pp 26-30 (2018)
Physics and Imaging in Radiation Oncology
Physics and Imaging in Radiation Oncology, Vol 5, Iss, Pp 26-30 (2018)
Physics and Imaging in Radiation Oncology
Background and purpose: Conversion factors between dose to medium (Dm,m) and dose to water (Dw,w) provided by treatment planning systems that model the patient as water with variable electron density are currently based on stopping power ratios. In t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::34d2868cfcefb6adf23026d849b9eddc
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/330517
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/330517
Autor:
G. Gerganov, Iwan Kawrakow, Assen S. Kirov, Yordan Madzhunkov, C. Ross Schmidtlein, Krasimir Mitev
Publikováno v:
Medical Physics. 39:4175-4186
Purpose: The purpose of this work is to study the influence of photon energy cuts on the results of positron emission tomography(PET)Monte Carlo(MC) simulations. Methods: MC simulations of PET scans of a box phantom and the NEMA image quality phantom
Autor:
Rowan M. Thomson, Iwan Kawrakow
Publikováno v:
Physica Medica. 42:18-19
Purpose Monte Carlo simulations are being applied to study radiation interactions and energy deposition on sub-micron length scales within cells, e.g., DNA, in diverse contexts across medical physics. While these classical trajectory Monte Carlo simu
Autor:
Rowan M. Thomson, Iwan Kawrakow
Publikováno v:
Medical Physics. 38:4531-4534
Purpose: The validity of “classic” Monte Carlo(MC) simulations of electron and positrontransport at sub-1 keV energies is investigated in the context of quantum theory. Methods: Quantum theory dictates that uncertainties on the position and energ
Publikováno v:
Physics in Medicine and Biology. 55:4535-4546
The purpose of this study is to determine whether dose to medium, D(m), or dose to water, D(w), provides a better estimate of the dose to the radiosensitive red bone marrow (RBM) and bone surface cells (BSC) in spongiosa, or cancellous bone. This is
Autor:
Iwan Kawrakow, Jeroen Verhaeghe, Long Zhang, Steven Staelens, Stefaan Vandenberghe, Roel Van Holen, Jan De Beenhouwer
Publikováno v:
Medical Physics. 37:3667-3676
Purpose: Several studies have shown the benefit of an accurate system modeling using Monte Carlo techniques. For state-of-the-art whole-body positron emission tomography(PET)scanners, Monte Carlo-based image reconstruction is associated with a signif