Abstract
The present work shows an characterization of the Varian linear accelerator EDW physical properties, through experimental determinations, comparing them with calculations made by CadPlan treatment planning system, under the same conditions. The following parameters were determined: EDW factor for square and rectangular fields on the central axis and off-axis, EDW factor dependency with the static collimator, percentage depth dose, EDW factor dependency with the depth on the central axis and off-axis, EDW angles and field profiles on several depths. It was verified that the EDW factor diminishes with the field size increment and with EDW nominal angle increment, and increases with energy increment. It is independent of the X collimator and dynamic collimator, except for small field sizes. It doesn't vary with depth on the central axis, but varies on the off-axis distances. A difference between EDW nominal angles and the EDW obtained experimentally was found, but it doesn't interfere in the treatment results. At the end of this work, a set of physical parameters to be determined for the commissioning, clinical implementation and quality assurance of the EDW is suggested. (author)
Citation Formats
Souza, Roberto Salomon de.
Study on the physical properties of the dynamic filter: unidimensional modulation; Estudo das propriedades fisicas do filtro dinamico: modulacao unidimensional.
Brazil: N. p.,
2005.
Web.
Souza, Roberto Salomon de.
Study on the physical properties of the dynamic filter: unidimensional modulation; Estudo das propriedades fisicas do filtro dinamico: modulacao unidimensional.
Brazil.
Souza, Roberto Salomon de.
2005.
"Study on the physical properties of the dynamic filter: unidimensional modulation; Estudo das propriedades fisicas do filtro dinamico: modulacao unidimensional."
Brazil.
@misc{etde_21062533,
title = {Study on the physical properties of the dynamic filter: unidimensional modulation; Estudo das propriedades fisicas do filtro dinamico: modulacao unidimensional}
author = {Souza, Roberto Salomon de}
abstractNote = {The present work shows an characterization of the Varian linear accelerator EDW physical properties, through experimental determinations, comparing them with calculations made by CadPlan treatment planning system, under the same conditions. The following parameters were determined: EDW factor for square and rectangular fields on the central axis and off-axis, EDW factor dependency with the static collimator, percentage depth dose, EDW factor dependency with the depth on the central axis and off-axis, EDW angles and field profiles on several depths. It was verified that the EDW factor diminishes with the field size increment and with EDW nominal angle increment, and increases with energy increment. It is independent of the X collimator and dynamic collimator, except for small field sizes. It doesn't vary with depth on the central axis, but varies on the off-axis distances. A difference between EDW nominal angles and the EDW obtained experimentally was found, but it doesn't interfere in the treatment results. At the end of this work, a set of physical parameters to be determined for the commissioning, clinical implementation and quality assurance of the EDW is suggested. (author)}
place = {Brazil}
year = {2005}
month = {Oct}
}
title = {Study on the physical properties of the dynamic filter: unidimensional modulation; Estudo das propriedades fisicas do filtro dinamico: modulacao unidimensional}
author = {Souza, Roberto Salomon de}
abstractNote = {The present work shows an characterization of the Varian linear accelerator EDW physical properties, through experimental determinations, comparing them with calculations made by CadPlan treatment planning system, under the same conditions. The following parameters were determined: EDW factor for square and rectangular fields on the central axis and off-axis, EDW factor dependency with the static collimator, percentage depth dose, EDW factor dependency with the depth on the central axis and off-axis, EDW angles and field profiles on several depths. It was verified that the EDW factor diminishes with the field size increment and with EDW nominal angle increment, and increases with energy increment. It is independent of the X collimator and dynamic collimator, except for small field sizes. It doesn't vary with depth on the central axis, but varies on the off-axis distances. A difference between EDW nominal angles and the EDW obtained experimentally was found, but it doesn't interfere in the treatment results. At the end of this work, a set of physical parameters to be determined for the commissioning, clinical implementation and quality assurance of the EDW is suggested. (author)}
place = {Brazil}
year = {2005}
month = {Oct}
}