A simple model for examining issues in radiotherapy optimization

A simple model for examining issues in radiotherapy optimization.

Convolution/superposition software has been used to produce a library of photon pencil beam dose matrices. This library of pencil beams is designed to serve as a tool for both education and investigation in the field of radiotherapy optimization. The elegance of this pencil beam model stems from its cylindrical symmetry. Because of the symmetry, the dose distribution for a pencil beam from any ...

Sampling issues for optimization in radiotherapy

A wide variety of optimization problems and techniques are used in radiation treatment planning. The problems typically involve large amounts of data, derived from simulations of patient anatomy and the properties of the delivery device. We investigate a three phase approach for their solution based on sampling of the underlying data that determines optimal beam angles, wedge orientations and d...

Presenting a Model for Student Development Issues

Abstract: This study aimed to provide a multilevel model of student development issues with a qualitative approach, using a systematic review of previous studies and the seven-step meta-combination method of Sandlowski and Barso (2007). For this purpose, to determine the direction of the study, the research question was selected, and then to collect information to answer the research question, ...

A Stochastic Optimization Model for Groundwater Management

A Stochastic Optimization Model for Groundwater Management