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

Senior Medical Physicist, Dept. of Medical Physics, CCI

BSc Eng.: Punjab University-1982
MSc Biomedical Eng: U of Alberta-1988
PhD Elect. Eng.: U of Alberta-1992

Member: Canadian College of Physicists in Medicine
PEng: Association of Professional Engineers and Geoscientists of Alberta (APEGA)

Research Interests

My general area of research revolves around imaging for guiding the fractionated radiotherapy. Primarily, I have been developing detector system for megavoltage imaging to be used in fan-beam and cone beam CT. We have been working on high density scintillator, cadmium tungstate, in order to study its detective quantum efficiency as a function of crystal height, pixel pitch, septa materials, and optical properties of the septa material. The effect of beam divergence on the thick segmented scintillators attached to flat panel has been quantified. We have fabricated a bench-top CT scanner to study the image performance of the cadmium tungstate based detector in megavoltage beam. Currently, this system is being extended into the cone-beam geometry.

I am also involved in the department wide project of integrating MRI with a linear accelerator. In this area, my research focuses on characterization of radiation induced conductivity and radiation damage to the components in MRI coils. I am also involved in understanding the radiofrequency interference produced by a linac that can adversely affect the MRI image quality. Radiation dosimetry measurement and radiation dose calculation in the presence of a strong MRI magnet are being investigated. I am helping a student in designing a home-grown MLC controller that will be used for demonstrating real-time tumor tracking using the MRI-linac system.

Selected Publications

S Rathee, B G Fallone, S Steciw,
"Technical Note: EPID's response to 6 MV photons in a strong, parallel magnetic field",
MED PHYS. Jan 2019: 46(1):340-344,
PubMed Link.

A Ghila, B G Fallone, S Rathee,
"Technical Note: Experimental verification of EGSnrc calculated depth dose within a parallel magnetic field in a lung phantom",
MED PHYS. Dec 2018: 45(12): 5653-5658,
PubMed Link.

E Yip, J Yun, Z Gabos, S Bakerm D Yee, K Wachowicz, S Rathee, BG Fallone,
"Evaluating performance of a user‐trained MR lung tumor autocontouring algorithm in the context of intra‐ and interobserver variations",
MED PHYS. Jan 2018: 45(1): 307-310,
PubMed Link.

A Ghila, S Steciw, B G Fallone, S Rathee,
"Experimental verification of EGSnrc Monte Carlo calculated depth doses within a realistic parallel magnetic field in a polystyrene phantom",
MED PHYS. Jun 2017,
PubMed Link.

M Reynolds, S Rathee, B G Fallone,
"Technical Note: Ion chamber angular dependence in a magnetic field",
MED PHYS. Jun 2017,
PubMed Link.

E Yip, J Yun, K Wachowicz, Z Gabos, S Rathee and B G Fallone,
"Sliding window prior data assisted compress sensing for MRI tracking of lung tumours",
Med. Phys., 44(1), 84-98 (2017),
PubMed Link.

A Ghila, B G Fallone, S Rathee,
"Influence of standard RF coil materials on surface and buildup dose of 6 MV photon beam in magnetic field",
Med. Phys., 43(11), 5808-5816 (2016),
PubMed Link.

J Yun, E Yip, Z Gabos, K Wachowicz, S Rathee and B G Fallone,
"Improved lung tumor autocontouring algorithm for intrafractional lung tumor tracking using 0.5T linac-MR",
Biomed. Phys. Eng. Express, 2 (2016)067004,
Abstract link in IOPScience.

M Reynolds, B G Fallone and S Rathee,
"Technical Note: Response Measurement of Selected Radiation Detectors in Magnetic Fields",
Med. Phys., 42, 2837-2840 (2015),
PubMed Link.

J.Yun, E. Yip, Z. Gabos, K. Wachowicz, S. Rathee, B.G. Fallone,
"Neural-network based autocontouring algorithm for intrafractional lung-tumor tracking using linac-MR",
Medical Physics, 42(5), pp. 2296-2310 (2015).
PubMed Link.

M. Reynolds, B.G. Fallone, S. Rathee,
"Dose response of selected solid state detectors in applied homogeneous trasnvferse and longitudinal magnetic fields",
Medical Physics, 41(9), 092103(12 pp). (2014),
PubMed Link

E. Yip, J. Yun, K. Wachowicz, Z. Gabos, A. Heikal, S. Rathee, B.G. Fallone
"Prior Data Assisted Compressed Sensing: A Novel MR imaging strategy for real time tracking of lung tumors",
Medical Physics: 41 (8), 082301(12 pp), (2014),
Featured in medicalphysicsweb.org, PubMed Link

M.R. Paudel, M. Mackenzie, B.G. Fallone, S. Rathee,
"Clinical evaluation of normalized metal artifact reduction in kVCT using MVCT prior images (MVCT-NMAR) for radiotherapy treatment planning",
Int J Rad Onc Biol Phys, 89(3), pp.682-689 (2014),
PubMed Link

S Steciw, S Rathee, B Warkentin,
"Modulation factors calculated with an EPID-derived MLC fluence model to streamline IMRT/VMAT second checks"
Journal of Applied Clinical Medical Physics. 14(6), 62-81 (2013).

B Warkentin, S Rathee, S. Steciw,
"2D Lag and signal non-linearity correction in an aS500 EPID and their impact on pretreatment dosimetric verification"
Med. Phys. 39(11), 6597-6608 (2012).

A. Keyvanloo, B. Burke, B. Warkentin, T. Tadic, S. Rathee, C. Kirkby, D.M. Santos, B.G. Fallone,
"Skin dose in longitudinal and transverse linac-MRIs using Monte Carlo and realistic 3D MRI field models."
Med Phys (10), 6509-6521 (2012).

C. Kirkby, B. Murray, S. Rathee, B.G. Fallone,
"Lung dosimetry in a linac-MR radiotherapy unit with a longitudinal magnetic field,"
Medical Physics,37(9) pp. 4722-4732 (2010).

M. Lamey, S. Rathee, L. Johnson, M. Carlone, E. Blosser, B.G. Fallone,
"Radiofrequency noise from the modulator of a linac,"
IEEE Trans Electromagnetic Compatibility, 52(3), pp. 530-538 (2010).

J. Yun, J. St-Aubin, S. Rathee, B.G. Fallone,
"Brushed permanent magnet DC MLC motor operation in an external magnetic field,"
Medical Physics, 37(5), pp. 2131-2134 (2010).

M. Lamey, J. Yun, B. Burke, S. Rathee, B.G. Fallone,
"Radiofrequency noise from an MLC: a feasibility study of the use of MLCs for linac-MR systems,"
Phys. Med. Biol., 55(4), pp..981-994 (2010).

M. Lamey, B. Burke, E. Blosser, S. Rathee, N. DeZanche, B.G. Fallone,
"Radiofrequency shielding for a linac-MRI system,"
Phys. Med. Biol., 55(4), pp. 995-1006(2010).
[Editor’s Choice]

B. Burke, B.G. Fallone, S. Rathee,
"Radiation induced currents in MR I- RF coils: application to linac-MR integration,"
Phys Med Biol, 55(3), pp. 735-746 (2010).

P. Kirvan, T. Monajemi, B.G. Fallone, S. Rathee,
"Performance Characterization of a MVCT Scanner using Multi-Slice Thick, Segmented Cadmium Tungstate-Photodiode Detectors,"
Medical Physics, 37(1), pp. 249-257 (2010).

D. Yee, M. Parliament, S Rathee, S. Ghosh, L. Ko, and B. Murray,
"Cone Beam CT Imaging Analysis of Daily Variations in Bladder Volume and Position during Radiotherapy for Bladder Cancer."
Int. J. Rad. Onc. Biol. Phys. 76(4) 1045-1053(2010).

B. Burke, M. Lamey, S. Rathee, B. Murray and B.G. Fallone,
"Radio Frequency noise from clinical linear accelerators."
Phys. Med. Biol. 54(April), 2483-2492(2009).

B.G. Fallone, B. Murray, S. Rathee, T. Stanescu, S. Steciw, S. Vidakovic, E. Blosser and D.  Tymofichuk,
"First MR images obtained during megavoltage photon irradiation from a prototype linac-MR system."
Med. Phys. 36, 2084-2088(2009).

C. Kirkby, T. Stanescu, S. Rathee, M. Carlone, B. Murray and B.G. Fallone,
"Patient dosimetry for hybrid MRI-radiotherapy systems."
Med. Phys. 35, 1019-1027 (2008).

K. Breitman, S. Rathee, C. Newcomb, B. Murray, D. Robinson, C. Field, H. Warkentin, S. Connors, M. MacKenzie, P. Dunscombe and B.G. Fallone,
"Experimental Validation of the Eclipse AAA Algorithm."
J. App. Clin. Med. Phys, 8(2), pp.76-92, Spring (2007).

T. Monajemi, B.G. Fallone, S. Rathee,
"Thick segmented CdWO4 photodiode detector for Cone Beam CT: A Monte Carlo study of system design parameters."
Med. Phys. 33(12), pp. 4567-4577, 2006.

S. Rathee, D. Tu, T. Monajemi, D. Rickey and B.G. Fallone,
"A bench-top megavoltage fan-beam CT using CdWO⁴ -photodiode detectors: I. System description and detector characterization."
Med. Phys. 33(4), pp. 1078-1089,2006.

T. Monajemi, D. Tu, B.G. Fallone and S. Rathee,
"A bench-top megavoltage fan-beam CT using CdWO⁴ -photodiode detectors: II. Image performance evaluation."
Med. Phys. 33(4), pp. 1090-1100,2006.

H.S. Jans, A.M. Syme, S. Rathee, B.G. Fallone,
"3D inter-fraction patient position verification using 2D-3D registration of orthogonal images."
Med. Phys. 33, 1420-1439 (2006).

K.D. Nakonechny, B.G. Fallone and S. Rathee (2005),
"Novel methods of measuring single scan dose profiles and cumulative dose in CT."
Med. Phys. Vol. 32, No. 1, pp. 98-109, 2005.

S. Steciw, B. Warkentin, S. Rathee and B.G. Fallone,
"Three dimensional IMRT verification with a flat-panel EPID."
Medical Physics, Vol. 32, No. 2, pp. 600-612, 2005.

S. Rathee,
"Book Review: Foundation of Image Science by H H Barrett and K J Myers, 1540 pp., Wiley Hoboken, New Jersey, 2004."
Med. Phys. 31(4), pp. 953, 2004.

T. Monajemi, S. Steciw, B.G. Fallone and S. Rathee,
"Modeling Scintillator-Photodiodes as Detectors for Megavoltage CT."
Medical Physics 31(5), pp. 1225-1234, 2004.

C. Schroeder, T. Stanescu, S. Rathee and B.G. Fallone,
"Lag Measurement in an a-Se Active Matrix Flat Panel Imager."
Med. Phys. 31(5), pp. 1203-1209, 2004.

D. Severin, S. Connors, H. Thompson, S. Rathee, P. Stavrev and J. Hanson,
"Breast Radiotherapy with Inclusion of Internal Mammary Nodes: A Comparison of Techniques with 3D Planning."
Int. J. Rad. Onc. Biol. Phys. 55(3), pp. 633-644, 2003.

B. Warkentin, S. Steciw, S. Rathee and B.G. Fallone,
"Dosimetric IMRT verification with a flat-panel EPID."
Med. Phys. 30, pp. 3143-3155, 2003. [Winner of 2003 Farrington Daniels Award for Best Article on Radiation Dosimetry]

S. Steciw, T. Stanescu, S. Rathee and B.G. Fallone,
"Sensitivity Reduction in Biased Amorphous Selenium Photoconductors."
Journal of Physics D: Applied Physics 35, pp. 2716-2722, 2002.

S. Rathee, B.G. Fallone and D. Robinson,
"Modulation Transfer Function of Digitally Reconstructed Radiographs for Spiral Computed Tomography."
Med. Phys 29(1), pp. 86-89, 2002.

A. Berndt, S. Rathee, D.W. Rickey and J. Bews,
"An 8-channel Detector for an 192Ir Brachytherapy Source-based Computed Tomography Scanner."
IEEE Trans Nucl. Sci., Vol. 47, No3, pp. 1261-1267, 2000.

A. Berndt, D.W. Rickey, S. Rathee and J. Bews,
"Size and positioning reproducibility of 192Ir brachytherapy stepping source."
Medical Physics 27(1), pp. 129-131, 2000.