Author ORCID Identifier


Date of Graduation


Document Type

Dissertation (PhD)

Program Affiliation

Medical Physics

Degree Name

Doctor of Philosophy (PhD)

Advisor/Committee Chair

Mohammad Salehpour

Committee Member

David Jaffray

Committee Member

Dirk Bartkoski

Committee Member

Peter Balter

Committee Member

Khandan Keyomarsi

Committee Member

Ramesh Tailor

Committee Member

Surendra Prajapati


The Monte Carlo particle simulator TOPAS, the multiphysics solver COMSOL., and

several analytical radiation transport methods were employed to perform an in-depth proof-ofconcept

for a high dose rate, high precision converging beam small animal irradiation platform.

In the first aim of this work, a novel carbon nanotube-based compact X-ray tube optimized for

high output and high directionality was designed and characterized. In the second aim, an

optimization algorithm was developed to customize a collimator geometry for this unique Xray

source to simultaneously maximize the irradiator’s intensity and precision. Then, a full

converging beam irradiator apparatus was fit with a multitude of these X-ray tubes in a

spherical array and designed to deliver converged dose spots to any location within a small

animal model. This aim also included dose leakage calculations for estimation of appropriate

external shielding. The result of this research will be the blueprints for a full preclinical

radiation platform that pushes the boundaries of dose localization in small animal trials.


Small animal radiotherapy, Preclinical research, FLASH therapy, Microradiotherapy, Simulation, Monte Carlo particle transport, Mathematical modelling, Finite element analysis, X-ray tube, Orthovoltage



To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.