Accurate determination of the head scatter factor is an important issue, especially for
intensity modulated radiation therapy, where the segmented fields are often very irregular …

Multileaf collimators (MLCs) are in clinical use for more than a decade and are a well
accepted tool in radiotherapy. For almost each MLC design different empirical or …

For accurate monitor unit calculation, it is important to calculate the output ratio in air, for an
irregular field shaped by MLC. We have developed an algorithm to calculate based on an …

Factor based methods for absorbed dose or monitor unit calculations are often based on
separate data sets for open and wedged beams. The determination of basic beam …

During radiation therapy, the mobility of the multi-leaf collimator varies according to the
shape of the tumor and the angle of the collimator. Therefore, the purpose of this study is to …

The purpose of this project was to develop an effective and time-efficient plan
checkingprocedure using a combination of ionization chambers and film. A 0.6 cc volume …

This dissertation is divided into 6 chapters. In the first chapter a brief introduction to the
Monte Carlo methods, x-ray beam properties and nanodosimetry are presented. The …

The concept of equivalent square has been looked at by many authors. The approaches
range from simple approximations to summation methods and integration methods. These …