Edgardo Doerner's research while affiliated with Pontificia Universidad Católica de Chile and other places

Publications (8)

Article
Purpose: To present a parallel solution for the EGSnrc Monte Carlo code system combining MPI and OpenMP programming models as an alternative to the provided implementation, based on the use of a batch queueing system (BQS). Methods: Relying on a previous implementation based on OpenMP by E. Doerner and P. Caprile [Med. Phys. 44, 6672 (2017)], th...
Article
Full-text available
In this work the use of the OpenCL framework to implement the parallel processing of the Monte Carlo (MC) simulation of the transport of photons on matter is presented. Our platform, named OCL_MC, relies on the physical model for photons implemented in EGSnrc and adapts it for execution across heterogeneous platforms consisting of central processin...
Article
Purpose: To present the implementation of a new option for parallel processing of the EGSnrc Monte Carlo system using the OpenMP API, as an alternative to the provided method based on the use of a batch queuing system (BQS). Methods: The parallel solution presented, called OMP_ EGS, makes use of OpenMP features to control the workload distributi...
Article
Full-text available
The shape of the radiation source of a linac has a direct impact on the delivered dose distributions, especially in the case of small radiation fields. Traditionally, a single Gaussian source model is used to describe the electron beam hitting the target, although different studies have shown that the shape of the electron source can be better desc...
Article
Full-text available
In this work the use of OpenMP to implement the parallel processing of the Monte Carlo (MC) simulation of the coupled transport for photons and electrons is presented. This implementation was carried out using a modified EGSnrc platform which enables the use of the Microsoft Visual Studio 2013 (VS2013) environment, together with the developing tool...
Article
Helical TomoTherapy® ist die Firmenbezeichnung einer Bestrahlungstechnik, die auf der Überlagerung vieler kleiner Strahlenfelder beruht, um die vorgeschriebene Dosis zur Behandlung einer Tumorerkrankung zu erreichen. In dieser Arbeit wird ein Dosis-Berechnungsmodell vorgestellt, das im Rahmen der Qualitätssicherung als eine Methode der Dosisverifik...
Article
A new component module (CM) named MMLC was developed for the Monte Carlo code BEAMnrc. It models the geometry and the dosimetrical characteristics of the add-on miniature multileaf collimator ModuLeaf (MRC Systems GmbH, Heidelberg, Germany, now part of Siemens, Erlangen, Germany). The new component module is partly based on the existing CM called D...
Article
A new component module (CM) named mini multileaf collimator (mMLC) was developed for the Monte Carlo code BEAMnrc. It models the geometry of the add-on miniature multileaf collimator ModuLeaf (MRC Systems GmbH, Heidelberg, Germany, now part of Siemens, Erlangen, Germany). The new CM is partly based on the existing CM called DYNVMLC. The development...

Citations

... Based on Chen et al. [15] study, Doerner et al. [16] performed their work to check the influence of the double-Gaussian source model on small-field dosimetry. For this purpose, the authors implemented the model into the BEAMnrc code and proved that it provided better agreement between the MC simulation and the measurements (via the Siemens PRIMUS linac). ...
... To simulate a specific interaction process carried out using specialized software, the Monte Carlo method considers the use of number sequences that are called seeds. Consequently, pseudo-random numbers can be obtained [33]. The random number generator, on which a platform is based under this method, can contain about 10,171 numbers, where the variance (Equation (8)) represents the statistical uncertainty, ...
... [12] Caprile et al. measured and calculated the output factors (OF) on the TomoTherapy machine with the smallest field size of 1.25 cm in the X-direction and fixed 5 cm jaw opening. [13] A recent publication by Lopes et al. [14] calculated the correction factor for the Standard Imaging A1SL ionization chamber. They also measured the beam quality index TPR 20,10 (10), and OF with the smallest field size of 1.25 cm in the X-direction. ...
... This model was introduced in the BEAMnrc user code as a source routine using a modified EGSnrc platform. (20) The user must provide the a i and σ i parameters for each Gaussian distribution, in cm, indicating their weights and breadths, respectively. Alternatively to σ i , the user can input the FWHM, also in cm, corresponding to each Gaussian. ...