AbstractsAstronomy & Space Science
Predicting Electron Insert Output Factors at Nominal and Extended Source to Surface Distance
| Institution: | Louisiana State University |
|---|---|
| Department: | Physics and Astronomy |
| Degree: | MS |
| Year: | 2002 |
| Keywords: | extended ssd; electron radiation therapy; insert output factors |
| Record ID: | 1728264 |
| Full text PDF: | http://etd.lsu.edu/docs/available/etd-0830102-145811/ |
Abstract
Two Varian linear accelerators were used to test the modified sector-integration method. This method can predict the electron insert factor for arbitrary inserts at different source to surface distances (SSD). The effective source distances (SSD<sub>eff</sub>) and insert factors (IF) for several accelerators are compared. The relationship of IF and SSD<sub>eff</sub> for machine type, energy, cone size, insert size and SSD is presented. The results were fed into the electron output determination module of an existing monitor unit calculator (MUCalc) which uses the modified sector integration method. Prediction and measurements were compared for various clinical inserts at several SSDs.
