Exploració per autor "Sempau Roma, Josep"
Ara es mostren els items 1-20 de 30
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A general analytical solution to the geometrical problem of field matching in radiotherapy
Hernández, V.; Arenas, M.; Pons, F.; Sempau Roma, Josep (2009)
Article
Accés restringit per política de l'editorialPurpose: Several authors studied the problem of geometrical matching of fields produced by medical linear accelerators. However, a general solution has yet to be published. Currently available solutions are based on ... -
A geometrical model for the Monte Carlo simulation of the TrueBeam linac
Rodríguez Niedenführ, Miquel; Sempau Roma, Josep; Fogliata, Antonella; Cozzi, L.; Sauerwein, W.; Brualla, L. (2015-06)
Article
Accés obertMonte Carlo simulation of linear accelerators (linacs) depends on the accurate geometrical description of the linac head. The geometry of the Varian TrueBeam linac is not available to researchers. Instead, the company ... -
A method for accurate zero calibration of asymmetric jaws in single-isocenter half-beam techniques
Hernandez Espinosa, Victor; Sempau Roma, Josep; Abella, R.; Romero Lopez, Matilde; Lopez Perez, Marcedes; Artigues, Manel; Arenas, M. (2013-02)
Article
Accés restringit per política de l'editorialPurpose: To present a practical method for calibrating the zero position of asymmetric jaws that provides higher accuracy at the central axis and improves dose homogeneity in the abutting region of half-beams. Methods: ... -
Absolute quantification in dopaminergic neurotransmission SPET imaging using a Monte Carlo-based scatter correction and fully 3D reconstruction
Ros, D; Pavía, J; Cot Sanz, Alberto; Falcón, C; Crespo, C; Sempau Roma, Josep; Pareto, D; Bullich, S; Lomeña, F; Calviño Tavares, Francisco (2005-09)
Article
Accés restringit per política de l'editorialDopamine transporter (DAT) ligands have been developed for in vivo imaging of the dopaminergic system in SPECT. Although the visual analysis of SPECT images is, in general, suitable for clinical assessment, the accurate ... -
Comparison between PENELOPE and electron Monte Carlo simulations of electron fields used in the treatment of conjunctival lymphoma
Brualla Barbera, Lorenzo; Palanco Zamora, R.; Witting, A.; Sempau Roma, Josep; Sauerwein, W. (2009-08)
Article
Accés restringit per política de l'editorialFor the treatment of conjunctival lymphoma in the early stages, external beam radiotherapy offers a curative approach. Such treatment requires the use of highly conformed small radiation beams. The beam size is so small ... -
Development and applications of a computer code for Monte Carlo simulation of electronphoton showers
Sempau Roma, Josep (Universitat Politècnica de Catalunya, 1996-02-29)
Tesi
Accés obertSe presenta el trabajo realizado sobre el paquete de Subrrutinas Penélope. Este código permite la simulación MC del transporte de fotones y electrones en la materia con geometrías complejas. Los aspectos considerados ... -
DPM as a radiation transport engine for PRIMO
Rodríguez, Miguel; Sempau Roma, Josep; Bäumer, Christian (Springer (Biomed Central Ltd.), 2018-12-27)
Article
Accés obertBackground PRIMO is a dose verification system based on the general-purpose Monte Carlo radiation transport code penelope, which implements an accurate physics model of the interaction cross sections and the radiation ... -
Effect of oblique X-ray incidence in flat-panel computed tomography of the Breast
Badano, Aldo; Kyprianou, Iacovos S.; Freed, Melanie; Jennings, Robert J.; Sempau Roma, Josep (2009)
Article
Accés obertWe quantify the variation in resolution due to anisotropy caused by oblique X-ray incidence in indirect flat-panel detectors for computed tomography breast imaging systems. We consider a geometry and detector type ... -
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 ...