Eleonora Tavazzi completed a fellowship in BNAC in 2004, and joined BNAC again in April 2017. She received her medical degree at the University of Pavia in 2001, and her residency in Neurology at the Neurological Institute “C. Mondino”, in Pavia in 2006. Since then, she has been working in hospital settings where she acquired a thorough experience in the diagnosis and treatment of different neuroinflammatory diseases such as multiple sclerosis, neuromyelitis optica and infectious and para/postinfectious CNS diseases. Her scientific interests include the study of pathogenetic mechanisms of multiple sclerosis through the application of advanced MRI techniques and on the clinical and MRI characteristics of para/postinfectious encephalomyelitis. Her research has resulted in more than 60 publications, as well as a leading position in several studies funded by governmental and non governmental agencies.


Registered Vascular Technologist

Karen Marr, RVT, RDMS, is a Vascular Consultant for BNAC’s neurological Doppler research projects. Karen is an Arts & Science graduate from Niagara College, Welland, Ontario. Karen obtained her Ultrasound training thru Mohawk College, Hamilton, Ontario. Ms. Marr has over 25 years experience in vascular and diagnostic ultrasound imaging. Karen is responsible for the development, quality assurance, internal and external training of Doppler and Ultrasound neuroimaging. Ms. Marr serves on the Board of Directors of the International Society of Neuro-vascular Diseases.


Associate Professor of Neurology, Certified Clinical Neuroimager

After completing a Neurology residency at the University at Buffalo, Dr. Hojnacki received the National Multiple Sclerosis fellowship in 2006 and trained at the Jacobs Neurological Institute, Baird MS Center. In 2007, he began fellowship training in Diagnostic Neuroimaging with William Kinkel, MD FAAN one of the founding members of the American Society of Neuroimaging. In 2008, Dr. Hojnacki joined the University at Buffalo, Department of Neurology as an Assistant Professor of Neurology. He is board certified in Neurology with fellowship training in both Multiple Sclerosis/Neuroimmunology and Diagnostic Neuroimaging.

In outpatient clinical practice, Dr. Hojnacki evaluates for and treats conditions in neuroimmunology such as Multiple Sclerosis, Neuromyelitis optica (Devic’s Disease), Neurosarcoiodosis and Central Nervous System vasculitis. In addition to this, he provides diagnostic reports of brain and spine MRI’s for the Department of Neurology in the evaluation of all neurologic diseases. While on hospital service, Dr. Hojnacki diagnoses and treats all neurologic conditions as well as provides teaching to the neurology residents and medical students in training.

His research interests include Multiple Sclerosis, its etiology and treatment, diagnostic neuroimaging and neuroimaging analysis as well as stem cell research. Dr. Hojnacki is currently the site principal investigator for two emerging therapies in multiple sclerosis: Anti-LINGO, the first potential drug for remyelination of damaged nervous system tissue and daclizumab a once a month subcutaneous injection for multiple sclerosis. He also participates in numerous studies of all aspects of Multiple Sclerosis. In neuroimaging, he is involved in the development of advanced MRI techniques for many neurological conditions both for diagnosis and monitoring of disease progression.



MRI Software Engineer

Paul Polak earned his M.A.Sc (2009) from McMaster University (Hamilton, Canada) in Biomedical Engineering. His thesis work: “Implementation of Durga: a pseudo-random, non-Cartesian sampling scheme” was conducted under the guidance of Dr. Michael Noseworthy and Dr. Christopher Anand on a GE 3T scanner. Durga is an ultra-fast pulse sequence, which exploits randomness of the trajectories to allow k-space undersampling, producing noise instead of coherent aliasing in the resulting images.


In 2009 Paul worked at the Sunnybrook Research Institute in Toronto, Canada as part of a team designing a minimally-invasive, MRI-monitored, focused-ultrasound treatment for prostate cancer. Prior to graduate school, Paul worked for a few years as a software developer/consultant and has experience with a number of development languages, platforms and databases.


Currently, Paul is a MRI Software Engineer as part of the Sequence Development Unit at the BNAC and his research interests lie in pulse sequence development, image reconstruction, analysis software, DTI, SWI and other non-conventional MRI techniques.