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Bremsstrahlung spectrum reconstruction from gradient depth dose curves obtained in a water phantom

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Bremsstrahlung spectrum reconstruction from gradient depth dose curves obtained in a water phantom

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dc.contributor.author Juste Vidal, Belen Jeanine es_ES
dc.contributor.author Miró Herrero, Rafael es_ES
dc.contributor.author Verdú Martín, Gumersindo Jesús es_ES
dc.contributor.author Diez, S es_ES
dc.contributor.author Campayo, J. M. es_ES
dc.date.accessioned 2013-04-22T12:25:08Z
dc.date.issued 2011
dc.identifier.issn 0029-5450
dc.identifier.uri http://hdl.handle.net/10251/28109
dc.description.abstract [EN] Megavoltage sources are commonly used in radiotherapy treatments, and the determination of the spectral distribution of a photon beam is extremely important for exact dosimetry and for the calculation of therapeutic dose distributions. Since direct measurements of the spectrum are very difficult, we present a technique to accurately calculate the bremsstrahlung spectra based on a numerical reconstruction upon central-axis depth dose data measured in a water tank using inverse methods. The basic idea of this technique is that the measured depth dose curve can be expressed as a weighted superposition of monoenergetic depth dose curves. While traditional approaches directly use the measured depth dose data, we show the improvement of using the gradient of these data for reconstruction. The inverse problem in terms of gradients is shown to be markedly less illconditioned than the usual inverse problem. In each case, a Tikhonov regularization is introduced to minimize the effects of noise due to measurement and computation. We illustrate this theory to calculate a 6-MeV photon beam from an Elekta Precise radiotherapy unit utilizing the gradient of depth dose measurements in a water tank. es_ES
dc.language Inglés es_ES
dc.publisher American Nuclear Society es_ES
dc.relation.ispartof Nuclear Technology es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject Monte Carlo simulation es_ES
dc.subject Spectrum reconstruction es_ES
dc.subject MCNP5 es_ES
dc.subject.classification INGENIERIA NUCLEAR es_ES
dc.title Bremsstrahlung spectrum reconstruction from gradient depth dose curves obtained in a water phantom es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.13182/NT11-A12287
dc.rights.accessRights Cerrado es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Ingeniería Química y Nuclear - Departament d'Enginyeria Química i Nuclear es_ES
dc.contributor.affiliation Universitat Politècnica de València. Instituto de Seguridad Industrial, Radiofísica y Medioambiental - Institut de Seguretat Industrial, Radiofísica i Mediambiental es_ES
dc.description.bibliographicCitation Juste Vidal, BJ.; Miró Herrero, R.; Verdú Martín, GJ.; Diez, S.; Campayo, JM. (2011). Bremsstrahlung spectrum reconstruction from gradient depth dose curves obtained in a water phantom. Nuclear Technology. 175(1):175-181. doi:10.13182/NT11-A12287 es_ES
dc.description.accrualMethod S es_ES
dc.relation.publisherversion http://dx.doi.org/10.13182/NT11-A12287 es_ES
dc.description.upvformatpinicio 175 es_ES
dc.description.upvformatpfin 181 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 175 es_ES
dc.description.issue 1 es_ES
dc.relation.senia 217617


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