Federico Keszti

Name: Federico Keszti, BSc

Level at MPU: MSc student

Email: federico.keszti [at] mail.mcgill.ca

Supervisors: James Renaud, Jan Seuntjens

Research interests: Calorimetry, Detector Physics, Small-Field Dosimetry

 

Research summary

In external beam radiotherapy (EBRT), radiation is used with the premise of preferentially targeting malignancies while simultaneously sparring the healthy tissues and organs around them. It is therefore essential i¬¬n EBRT to be able to determine precisely and accurately how much radiation dose is being delivered. In primary standards dosimetry laboratories (PSDLs), radiation is usually measured with calorimeters; these detectors measure a change in temperature which is proportional to the amount of radiation received. Although these detectors provide the highest standard of accuracy, PSDL calorimeters are large, expensive, fragile and require a high level of expertise to be handled and operated. To measure radiation in the clinic, detectors (or “dosimeters”) must be small, portable and easy to use – like the popular and widely available ion chamber or solid-state dosimeters. My project aims to continue current efforts in miniaturizing a graphite-based calorimeter to the size of a small probe-format ion chamber for use in the clinical setting. This work will involve study of heat transfer models inside the detector to better understand its response. Potential new designs and prototypes will also be explored. Due to its principle of operation, this calorimeter offers a significant advantage over other common clinical dosimeters: it provides absolute dose measurements rather than relative dose measurements. Additionally, it has reliably demonstrated to outperform other detectors in the presence of magnetic fields, making it particularly useful for MRI-guided linear accelerators.

 

Awards:

McGill University - Graduate Excellence Award (2018)

Cancer Care Ontario - Harold E. Johns Studentship Program (2017)