Date Approved


Graduate Degree Type


Degree Name

Medical Dosimetry (M.S.)

Degree Program

Health Professions

First Advisor

Lauren Rydquist

Academic Year



Purpose: The role of radiation therapy in managing prostate cancer has developed and improved greatly throughout the years. The purpose of this study was to analyze a newly developing method of treatment practices with two different therapy energies.

Methods: This retrospective study pulled patient data from the facility’s treatment planning system database who had primary prostate cancer treated to the prostate bed. Each patient was planned for the same treatment technique with two different beam energies, 6X and 6FFF (flattening filter free).

Results: A two-sample t-test was done to compare means of the max doses to the bladder, rectum, and femoral heads between the two energies, as well as the estimated time it would take for the treatment to be executed on the treatment machine. The means for the bladder, rectum, and max doses showed to have no difference between them but the time did show a significant difference.

Conclusions: There was not a dosimetric difference between treating with 6X and 6FFF energy, but a significant decrease in time, showing that it would be beneficial to treat with 6FFF. The decrease in time also decreases the chance of anatomical differences occurring between treatment set up and treatment completion.

Included in

Oncology Commons