Medical Physics Graduate Program Faculty

Ron Sloboda

Ron S. Sloboda, PhD, FCCPM

Professor, Division of Medical Physics, Department of Oncology, University of Alberta

Senior Medical Physicist, Dept. of Medical Physics, CCI

BSc (hons),(Physics: Manitoba-1974)
PhD (Nuclear Physics: Alberta -1979)

Fellow:Canadian College of Physicists in Medicine

Research Interests

My main research interests are dosimetry and treatment planning for brachytherapy, including the design of clinical studies to obtain patient data that inform model-based dose calculation. Our group has made use of Monte Carlo methods, thermoluminscent dosimeters, and radiochromic film to calculate and measure reference dose distributions around a variety of brachytherapy sources in the recent past. Current work is focused on incorporating MRI in the treatment planning, delivery, and evaluation processes, particularly for permanent prostate implants and intracavitary/interstitial cervix treatments. Serial imaging studies conducted in collaboration with the Radiation Oncology and Cancer Imaging departments are designed to elucidate the spatio-temporal behaviour of radiation sources and surrounding tissue over the course of brachytherapy treatment. Such data form the basis for improvements in clinical dosimetry that in turn have the potential to improve clinical outcomes.

Selected Publications

M Khadem, C Rossa, R Sloboda, N Usmani, M Tavakoli,
"Mechanics of tissue cutting during needle insertion in biological tissue".
IEEE Robotics and Automation Letters 2016; 1:800-807

E Weis, TG Salopek, JC McKinnon, MP Larocque, C Temple-Oberle, T Cheng, J McWhae, R Sloboda, M Shea-Budgell,
"Management of uveal melanoma: a consensus-based provincial clinical practice guideline".
Current Oncology 2016; 23:e57-e64

M Waine, C Rossa, R Sloboda, N Usmani, M Tavakoli,
"Needle tracking and deflection prediction for robot-assisted needle insertion using 2D ultrasound images".
J Med Robotics Research 2016; 1:1640001:1-11

C Rossa, J Fong, R Sloboda, N Usmani, M Tavakoli,
"Multi-actuator haptic feedback on the wrist for needle steering guidance in brachytherapy".
IEEE Robotics and Automation Letters 2016; 1:852-859

D Liu, T Meyer, N Usmani, I Kay, S Husain, S Angyalfi, R Sloboda,
"Implanted brachytherapy seed movement reflecting transrectal ultrasound probe-induced prostate deformation".
Brachytherapy 2015; 14:809-817.

J Hill, C Hackett, R Sloboda, G Menon, S Singhal, N Pervez, J Pedersen, D Yee, A Murtha, J Amanie, N Usmani,
"Does location of prostate cancer by sextant biopsies predict for relapse after 125I seed implant brachytherapy?".
Brachytherapy 2015; 14:788-794.

F Ballester, Å Carlsson-Tedgren, D Granero, A Haworth, F Mourtada, GP Fonseca, K Zourari, P Panagiotis, M Rivard, F-A Siebert, RS Sloboda, R Smith, RM Thomson, F Verhaegen, J Vijande, Y Ma, L Beaulieu,
"A generic high-dose-rate 192Ir brachytherapy source for evaluation of model-based dose calculations beyond the TG-43 formalism".
Med Phys 2015; 42:3048-3062

D Liu, R Sloboda,
"Fast dose kernel interpolation using Fourier transform with application to permanent prostate brachytherapy dosimetry".
Med Phys 2014; 41:051701.

H Morrison, G Menon, R Sloboda,
"Radiochromic film calibration for low-energy seed brachytherapy dose measurement".
Med Phys 2014; 41:072101.

N Usmani, N Leong, K Martell, L Lan, S Ghosh, N Pervez, J Pedersen, D Yee, A Murtha, J Amanie, R Sloboda, D Murray, M Parliament,
"Single-nucleotide polymorphisms studied for associations with urinary toxicity from 125I prostate brachytherapy implants".
Brachytherapy 2014; 13:285-291.

R Tao, M Tavakoli, R Sloboda, N Usmani,
"A comparison of US versus MR based 3D prostate shapes using radial basis function interpolation and statistical shape models".
IEEE J Biomedical and Health Informatics 2015; 19:623-634.

C Hackett, S Ghosh, R Sloboda, K Martell, L Lan, N Pervez, J Pedersen, D Yee, A Murtha, J Amanie, N Usmani,
"Distinguishing prostate specific antigen bounces from biochemical failure after low dose rate prostate brachytherapy".
J Contemp Brachytherapy 2014; 6:247-253.

G Menon, F Huang, R Sloboda, R Pearcey, S Ghosh,
"Practically achievable maximum HR-CTV doses in MRI-guided intracavitary brachytherapy for cervix cancer: A planning study".
Brachytherapy 2014; 13:572-578.

N Usmani, K Martell, S Ghosh, H Moore, N Pervez, J Pedersen, D Yee, A Murtha, J Amanie and R Sloboda,
"Comparison of low and intermediate source strengths for I-125 prostate brachytherapy implants".
Brachytherapy 2013; 12:442-448.

N Jastaniyah, R Sloboda, W Kamal, H Moore, S Ghosh, N Pervez, J Pedersen, D Yee, B Danielson, A Murtha, J Amanie, N Usmani,
"Regional treatment margins for prostate brachytherapy".
Brachytherapy 2013, 12:596-602.

T Lehmann, M Tavakoli, N Usmani, RS Sloboda,
"Force-sensor-based estimation of needle tip deflection in brachytherapy".
J Sensors 2013; 263153:1-10.

J Ren, G Menon, RS Sloboda,
"Comparative evaluation of two dose optimization methods for image-guided, highly-conformal, tandem and ovoids cervix brachytherapy planning".
Phys Med Biol 2013 58: 2045-2058.

D Liu, N Usmani, RS Sloboda,
"Transrectal ultrasound based prostate volume determination: Is the frustum algorithm more accurate than planimetry?"
Med Phys 2013; 40:031705/1-4.

J Pouliot, R Sloboda, B Reniers,
Two-, Three-, and Four-Dimensional Brachytherapy.
In: J Venselaar, D Baltas, A Soleimani-Meigooni, PJ Hoskin, eds.
Comprehensive Brachytherapy: Physical and Clinical Aspects. Taylor and Francis 2012.

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