Exploració per autor "Sempau Roma, Josep"
Ara es mostren els items 9-28 de 30
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Modeling of high-energy contamination in SPECT Imaging using Monte Carlo Simulation
Cot Sanz, Alberto; Jané, E; Sempau Roma, Josep; Falcón, C; Bullich, S; Pavía, J; Calviño Tavares, Francisco (2006-02)
Article
Accés restringit per política de l'editorialI is a commonly used radioisotope employed in neurotransmitter SPECT studies. In addition to an intense line at 159 keV, the decay scheme of this radioisotope includes a low yield ( 3%) of higher energy photons which ... -
Modelling of high-energy contamination in SPECT imaging using Monte Carlo simulation
Cot Sanz, Alberto; Jané, E; Sempau Roma, Josep; Falcón, C; Bullich, S; Pavía, J; Calviño Tavares, Francisco; Ros, D (IEEE, 2004)
Text en actes de congrés
Accés restringit per política de l'editorial3I is a commonly used radioisotope employed in neurotransmitter SPECT studies. In addition to an intense line at 159 keV, the decay scheme of this radioisotope includes a low yield (∼3%) of higher energy photons which ... -
Monte Carlo calculation of beam quality correction factors in proton beams using detailed simulation of ionization chambers
Gomà, Carles; Andreo Hernández, Pedro; Sempau Roma, Josep (2016-03-04)
Article
Accés obertThis work calculates beam quality correction factors (k Q) in monoenergetic proton beams using detailed Monte Carlo simulation of ionization chambers. It uses the Monte Carlo code penh and the electronic stopping powers ... -
Monte Carlo dosimetry for forthcoming clinical trials in x-ray microbeam radiation therapy
Martínez-Rovira, Imma; Sempau Roma, Josep; Fernández-Varea, Jose Maria; Bravin, A.; Prezado, Y. (2010)
Article
Accés obertThe purpose of this work is to define safe irradiation protocols in microbeam radiation therapy. The intense synchrotron-generated x-ray beam used for the treatment is collimated and delivered in an array of 50 μm-sized ... -
Monte Carlo simulation of the Varian TrueBeam flattened-filtered beams using a surrogate geometry in PRIMO
Rodríguez Olmos, Miguel David; Sempau Roma, Josep; Brualla, Lorenzo (Springer, 2024-01-25)
Article
Accés obertBackground. Monte Carlo simulation of radiation transport for medical linear accelerators (linacs) requires accurate knowledge of the geometrical description of the linac head. Since the geometry of Varian TrueBeam ... -
Monte Carlo verification of the holder correction factors for the radiophotoluminescent glass dosimeter used by the IAEA in international dosimetry audits
Sempau Roma, Josep; Kazantsev, Pavel; Izewskac, Joanna; Brualla Barberá, Lorenzo (2021-06-01)
Article
Accés obertThe International Atomic Energy Agency (IAEA), jointly with the World Health Organization (WHO), has operated a postal dosimetry audit program for radiotherapy centers worldwide since 1969. In 2017 the IAEA introduced a ... -
Monte Carlo-based dose calculation engine for minibeam radiation therapy
Martínez Rovira, Immaculada; Sempau Roma, Josep; Prezado, Yolanda (2014-02)
Article
Accés restringit per política de l'editorialMinibeam radiation therapy (MBRT) is an innovative radiotherapy approach based on the wellestablished tissue sparing effect of arrays of quasi-parallel micrometre-sized beams. In order to guide the preclinical trials in ... -
On the beam hardening correction of the transit-guided radiation therapy attenuation model
Latorre Musoll, Artur; Jornet Sala, Núria; Sempau Roma, Josep (2023-08-09)
Article
Accés restringit per política de l'editorialPurpose The Transit-Guided Radiation Therapy (TGRT) technique is a novel technique aimed to quantify the position error of a patient by using the transit portal images (TPI) of the treatment fields. Despite of the promising ... -
Output correction factors for nine small field detectors in 6 MV radiation therapy photon beams: A PENELOPE monte carlo study
Benmakhlouf, Hamza; Sempau Roma, Josep; Andreo, Pedro (2014-03)
Article
Accés restringit per política de l'editorialPurpose: To determine detector-specific output correction factors, k fclin,fmsr Qclin,Qmsr , in 6 MV small photon beams for air and liquid ionization chambers, silicon diodes, and diamond detectors from two manufacturers. ... -
PENELOPE-2008: A Code System for Monte Carlo Simulation of Electron and Photon Transport
Salvat, Francesc; Fernández-Varea, Jose Maria; Sempau Roma, Josep (2009)
Working paper
Accés obertThe computer code system PENELOPE (version 2008) performs Monte Carlo simulation of coupled electron-photon transport in arbitrary materials for a wide energy range, from a few hundred eV to about 1 GeV. Photon transport ... -
PENELOPE/PRIMO-calculated photon and electron spectra from clinical accelerators
Brualla, Lorenzo; Rodríguez, Miguel; Sempau Roma, Josep; Andreo, Pedro (Springer (Biomed Central Ltd.), 2019-01-11)
Article
Accés obertBackground: The availability of photon and electron spectra in digital form from current accelerators and Monte Carlo (MC) systems is scarce, and one of the packages widely used refers to linacs with a reduced clinical use ... -
PenMesh-Monte Carlo radiation transport simulation in a triangle mesh geometry
Badal Soler, Andreu; Kyprianou, Iacovos; Banh, Diem Phuc; Badano, Aldo; Sempau Roma, Josep (2009-12)
Article
Accés obertWe have developed a general-purpose Monte Carlo simulation code, called penMesh, that combines the accuracy of the radiation transport physics subroutines from PENELOPE and the flexibility of a geometry based on triangle ... -
PRIMO: A graphical environment for the Monte Carlo simulation of Varian and Elekta linacs
Rodriguez, Manuel Jairo; Sempau Roma, Josep; Brualla, Lorenzo (2013-10)
Article
Accés restringit per política de l'editorialBackground: The accurate Monte Carlo simulation of a linac requires a detailed description of its geometry and the application of elaborate variance-reduction techniques for radiation transport. Both tasks entail a substantial ... -
Quantification of dopaminergic neurotransmission SPECT studies with I-123-labelled radioligands. A comparison between different imaging systems and data acquisition protocols using Monte Carlo simulation
Ros, D; Pavia, J; Calviño Tavares, Francisco; Lomena, F; Crespo, C; Gallego, J; Cot Sanz, Alberto; Falcon, C; Bullich, S; Pareto, D; Aguiar, P; Sempau Roma, Josep (2008-07)
Article
Accés restringit per política de l'editorialPurpose 123I-labelled radioligands are commonly used for single-photon emission computed tomography (SPECT) imaging of the dopaminergic system to study the dopamine transporter binding. The aim of this work was to ... -
RECORDS: improved reporting of Monte Carlo radiation transport studies
Sechopoulos, Ioannis; Rogers, David W.O.; Bazalova Carter, Magdalena; Sempau Roma, Josep (2018-07-15)
Article
Accés obertStudies involving Monte Carlo simulations are common in both diagnostic and therapy medical phy- sics research, as well as other fields of basic and applied science. As with all experimental studies , the conditions and ... -
RECORDS: Improved reporting of Monte Carlo radiation transport studies: Report of the AAPM Research Committee Task Group 268
Sechopoulos, Ioannis; Rogers, D.W.O.; Bazalova Carter, Magdalena; Bolch, Wesley E.; Heath, Emily C.; McNitt-Gray, Michael F.; Sempau Roma, Josep; Williamson, Jeffrey F. (2018-01-01)
Article
Accés obert© 2017 American Association of Physicists in Medicine. Studies involving Monte Carlo simulations are common in both diagnostic and therapy medical physics research, as well as other fields of basic and applied science. As ... -
Spencer–Attix water/medium stopping-power ratios for the dosimetry of proton pencil beams
Gomà, Carles; Andreo, Pedro; Sempau Roma, Josep (2013-03-21)
Article
Accés restringit per política de l'editorialThis paper uses Monte Carlo simulations to calculate the Spencer-Attix water/medium stopping-power ratios (sw, med) for the dosimetry of scanned proton pencil beams. It includes proton energies from 30 to 350 MeV and typical ... -
Technical Note: On the efficiency of variance reduction techniques for Monte Carlo estimates of imaging noise
Sharma, Diksha; Sempau Roma, Josep; Badano, Aldo (2018-02)
Article
Accés obertAmerican Association of Physicists in Medicine. Purpose: Monte Carlo simulations require large number of histories to obtain reliable estimates of the quantity of interest and its associated statistical uncertainty. Numerous ... -
Technical Note: Study of the electron transport parameters used in penelope for the Monte Carlo simulation of Linac targets
Rodriguez, Miquel; Sempau Roma, Josep; Brualla, Lorenzo (2015-06-01)
Article
Accés restringit per política de l'editorialPurpose: The Monte Carlo simulation of electron transport in Linac targets using the condensed history technique is known to be problematic owing to a potential dependence of absorbed dose distributions on the electron ... -
The influence of the field setup on the dosimetry of abutted fields in single-isocenter half-beam techniques
Hernández, V.; Sempau Roma, Josep (2011-03)
Article
Accés restringit per política de l'editorialPurpose: To study the influence of the field setup on the dosimetry at the junction in singleisocenter half-beam techniques. Methods: The dosimetry at the junction for a two-field setup with the gantry at zero was ...