Jayapalli Rajiv Bapuraj, MD


Jayapalli Rajiv Bapuraj, MD


jayapalli rajiv bapuraj, md

Assistant Professor, Radiology



Dr. Bapuraj is an Assistant Professor in the division of Neuroradiology of the department of Radiology at the Univeristy Of Michigan. Dr. Bapuraj's research interest focuses on application of imaging techniques in translational research. His interests include phase contrast MRI applications for assessing CSF flow and diffusion imaging applications in hypoxic ischemic encephalopathy and traumatic brain injury. 

Neeraj Chaudhary, MD

Neeraj Chaudhary, MD

Neeraj Chaudhary, mD


Clinical Associate Professor,  Radiology
Clinical Associate Professor,  Neurology
Clinical Associatet Professor,  Neuroscience

(734) 763-2082

Dr. Neeraj Chaudhary is a neurointerventionalist by practice. He works under the auspices of the department of radiology and neurosurgery. He has a strong depth in his post graduate training (12 years) including 4 years of general surgery residency (1998 – 2002) and 4 years of Radiology residency (2002 – 2006) in the UK. He moved to the UK after his graduation from medical school in India (University of Calcutta – Kolkata Medical College & Hospital; 1989 – 1997) yearning to get to the source of Medicine (London, England) to get the best training in medicine in the world.

Dr. Chaudhary completed his training in two specialties with UK Board certification in each (Gen Surg – Member of the Royal College of Surgeons MRCS – 2000 & Radiology – Fellow of Royal College of Radiologists FRCR - 2006). His interest in Neurosciences led him to enhance his post graduate training initially in diagnostic neuroradiology (Fellowship – 2006 to 2007 – National Hospital for Neurology & Neurosurgery NHNN, Queen Square, University College London Hospitals NHS Trust) and then 2 years neurointerventional radiology (Fellowship: 2007 to 2008 – NHNN London UK & 2008 – 2009 University of Michigan Health System, Ann Arbor). His training in neurodiagnostic and neurointerventional Radiology was further reinforced by apprenticeship in advanced neuroimaging and neurointerventional procedures in the pediatric population at the Great Ormond Street Children’s Hospital, UK (probably one of the busiest Neurovascular practices in the world) as part of his training at NHNN Queen Square, UK (2006 -2008). He then joined the department of radiology at the University of Michigan as faculty from 2009.

Dr. Chaudhary works in a team of excellent and very talented practitioners across the departments of radiology, neurosurgery and neurology as a neurointerventional radiologist treating patients with neurovascular diseases of the entire neural axis (brain and spinal cord) including head, neck, face and orbit vascular malformations in adults and pediatric age groups. His research interests are in understanding the patho mechanisms of neural injury in hemorrhagic and ischemic stroke. He is involved in both clinical outcomes research and bench side basic science research where he collaborates with the cerebrovascular lab at BSRB with Professors Guohua Xi and Richard Keep.


David P. Fessell, MD

David P. Fessell, MD

david p. fessell, md

Associate Professor, Radiology



Dr. David Fessell is an Associate Professor of Radiology at the University of Michigan Hospital. He is a fellowship trained Musculoskeletal Radiologist who is certified by the American Board of Radiology. He received his MD degree from the University of Michigan and did his Radiology residency training and Musculoskeletal Radiology Fellowship at Henry Ford Hospital.

Dr. Fessell’s clinical interests are in the areas of trauma radiology, computer based radiology interpretation, and MSK ultrasound applications.  He is also passionate about innovation, teaching and mentoring. His research focuses on defining the accuracy of imaging modalities as well as new applications of imaging, especially ultrasound. He has published over 60 manuscripts and multiple book chapters and has won awards for excellence in teaching. He serves on the editorial boards of many of the leading publications in radiology and is a member of numerous radiology societies. He travels and lectures worldwide on a variety of topics in musculoskeletal radiology.  

Dr. Fessell currently directs the Leadership Curriculum for the University of Michigan Medical School.  He serves as an executive coach in the UM Health System and, as a Master Coach, is involved in coaching training.  He also consults on the topic of “Enhancing Creativity” and is a graduate of the Second City Improv Conservatory.

J. Brian Fowlkes, PhD

J. Brian Fowlkes, PhD

j. brian fowlkes, phd

Professor, Radiology, Basic Radiological Sciences Division
Professor, Biomedical Engineering                                                                                                  



J. Brian Fowlkes, PhD is Professor of Radiology and Professor of Biomedical Engineering and Director of the Basic Radiological Sciences Division in the Department of Radiology at the University of Michigan.

Dr. Fowlkes received his B. S. degree in physics from the University of Central Arkansas in 1983, and his M. S. and Ph.D. degrees from the University of Mississippi in 1986 and 1988, respectively, both in physics. He came to the University of Michigan in 1988 where he is currently directing and conducting research in medical ultrasound for diagnostic and therapeutic applications. His work includes studies of acoustic droplet vaporization for bubble production in therapeutic ultrasound and drug release, effects of gas bubbles in high intensity ultrasound including histotripsy and volume flow estimation for ultrasonic imaging. He has over 170 peer-reviewed scientific publications and over 280 abstract presentations.

Dr. Fowlkes is a Fellow of the American Institute of Ultrasound in Medicine (AIUM) and has served as its Secretary and Treasurer and as a member of its Board of Governors. He is also a three-time recipient of the AIUM Presidential Recognition Award for outstanding contributions and service to the expanding future of ultrasound in medicine and the Joseph H. Holmes Pioneer Award for Basic Science.  Dr. Fowlkes is a Fellow of the American Institute of Medical and Biomedical Engineering (AIMBE), the Acoustical Society of America (ASA) and the American Association of Physicists in Medicine (AAPM).

Stephen T. Hobson

Stephen T. Hobson

Stephen T. Hobson

Research Associate, Radiation Oncology


Stephen T. Hobson is a Special Forces Medical Sergeant in the US Army Green Berets. He spent 5 years on active duty with two combat deployments in support of Operation Enduring Freedom. Upon leaving the Army, he worked as a Research Associate in the Department of Radiation Oncology at University of Michigan Hospital. Stephen now serves in the National Guard, is completing coursework in U-M's Postbac MEDPRED program, and is applying to medical school. He and his wife live in Ann Arbor.


Oliver D. Kripfgans, PhD

Oliver D. Kripfgans, PhD

oliver d. kripfgans, phd

Research Associate Professor, Radiology
Research Associate Professor, Applied Physics
Research Associate Professor, Biomedical Engineering


Dr. Kripfgans’ research focus is centered on clinical implementation and physical aspects of medical ultrasound (diagnostics and therapeutics). As an experimental physicist by training with over 20 years in ultrasound, his expertise ranges from basic science to clinical implementation. The latter involves regular interactions with physician colleagues in Radiology and other departments.

High intensity focused ultrasound (HIFU) is investigated by Dr. Kripfgans (PI) for therapeutic applications in curative and palliative medicine. Together with colleagues from Radiology and Cardiology, myocardial microlesions are generated under ultrasonic and electrocardiographic guidance. Here, ultrasound contrast agents for cardiac imaging are exposed to HIFU to promote the focal treatment of hypertrophic cardiomyopathy by said microlesions. With this method, the clinical operator can non-invasively monitor procedure using real-time ultrasonic imaging, rather than by traditional scaring procedures such as surgical intervention or alcohol ablation. Sonoactive agents are investigated by Dr. Kripfgans for Magnetic Resonance guided thermal ablation procedures such as uterine fibroid ablation or treatment of hepatic cell carcinoma. Together with colleagues from Radiology ultrasound and MRI divisions, the basic science of effective energy conversion from acoustic waves to thermal energy is developed for expeditious procedure times. As a result, HIFU lesions placed by clinical MR guidance are created 15x faster than by current methods. In a collaborative effort of other these and other Radiology and Internal Medicine faculty, these sonoactive agents are engineered to carry infliximab to treat inflammatory bowel disease. 

Together with basic scientists and physician scientists from the Departments of Radiology, Internal Medicine, Cardiology, Dentistry, Maternal-Fetal Medicine, and Emergency Medicine, Dr. Kripfgans investigates how quantitative blood volume flow can be assessed avoiding current limitations when acquired in three dimensions. The nature of this approach is straight forward and will revolutionize ultrasonic blood volume flow imaging of the vascular system. As a clinical example, Transjugular Intrahepatic Porto-systemic Shunts are sonographically assessed by basic scientists and Interventional Radiology faculty. This non-invasive and quantitative blood volume flow assessment will potentially set a new industry standard for guiding the treatment of portal hypertension and its sequelae including variceal bleeding and ascites.

Implementation of this quantitative blood volume flow technique on clinical ultrasound scanners is now moving ahead with GE Medical Systems for initial application in Maternal-Fetal Medicine. In a study with OB/Gyn faculty and others, Dr. Kripfgans correctly identified two cases of intrauterine growth restriction and preeclampsia, demonstrating the potential for clinical diagnosis and identification of at-risk pregnancies.

Lena M. Napolitano, MD, FACS, FCCP, FCCM

Lena M. Napolitano, MD, FACS, FCCP, FCCM

lena m. napolitano, md, facs, fccp, fccm

Joyce & Don Massey Family Foundation Professor
Professor, Surgery
Associate Chair, Surgery
Director, Surgical Intensive Care Unit
Associate Director, Michigan Center for Integrative Research in Critical Care


Dr. Lena M. Napolitano is the Massey Foundation Professor of Surgery at the University of Michigan Hospital, (Trauma, Burns, Critical Care, and Emergency Surgery) and Co-Director of Surgical Critical Care. Dr. Napolitano is certified by the American Board of Surgery in General Surgery as well as Surgical Critical Care. She is a Fellow of the American College of Surgeons, the American College of Critical Care Medicine, and the American College of Chest Physicians. Dr. Napolitano is an Associate Director of the Michigan Center for Integrative Research in Critical Care (MCIRCC) and holds leadership positions in numerous professional organizations in surgery, trauma and surgical critical care.

Dr. Napolitano has served as a Director of the American Board of Surgery. Dr. Napolitano is also a past Chair of the Board of Governors of the American College of Surgeons and previously served as Secretary and member of the Executive Committee. She is a member of the Trauma, Burns, Critical Care Component Board of the American Board of Surgery, representing the American Association for the Surgery of Trauma (AAST). She has served on the AAST Board of Managers and Chaired the AAST Critical Care Committee and the Education Committee, and as a member of the Steering Committee of the U.S. Critical Illness and Injury Trials Group (USCIITG).

Dr. Napolitano has served as Chancellor of the Board of Regents of the American College of Critical Care Medicine and is a Fellow of the American College of Critical Care Medicine. She is past-Chair of the Surgical Section of SCCM, and served as SCCM Congress Co-Chair in 2006. She served as Chair of the Committee on Perioperative Care for the American College of Surgeons (ACS) from 2003-2005. She is past-Chair of the Multi-Institutional Trials Committee and a past member of the Board of Directors for the Eastern Association for the Surgery of Trauma.

Dr. Napolitano has also served as President and Past Secretary of the Surgical Infection Society. She is also a member of the Society of University Surgeons, the Association of Women Surgeons, and the American Surgical Association, among others. She participates nationally in many organizations, and is a member of the Surgical Education and Self-Assessment Program (SESAP) Committee of the ACS and a member of the Steering Committee of the ACS Fundamentals of Surgery Resident Curriculum Committee. She is a member of the national Surgical Care Improvement Project (SCIP) Technical Expert Panels for Respiratory and Infection, with the goal of reducing surgical complications in the United States by 25%.

Dr. Napolitano has served as Chair of the Board of Directors of the Council on Surgical and Perioperative Safety (www.cspsteam.org), a unique multidisciplinary coalition of 7 professional organizations whose members (over 250,000 members representing over 2 million healthcare practitioners) are involved in the care of surgical patients, and is still a member of the CSPS Board of Directors. CSPS Member organizations include American Association of Nurse Anesthetists (AANA): American Association of Surgical Physician Assistants (AASPA); American College of Surgeons (ACS); American Society of Anesthesiologists (ASA); American Society of PeriAnesthesia Nurses (ASPAN); Association of periOperative Registered Nurses (AORN); and Association of Surgical Technologists (AST).

Dr. Napolitano has a research effort in trauma and surgical critical care, and is Principal Investigator on a number of research grants focused on translational research. She is Associate Editor of the journal Surgical Infections and is a member of the Editorial Boards and reviewer for many academic journals, including New England Journal of Medicine, JAMA, Surgery, Annals of Surgery, Critical Care Medicine, Journal of Trauma, Shock, Chest, and many others.

Dr. Napolitano received the Packard Medal by the Uniformed Services University in 2011 for her research in Blood and Blood Product Transfusion. She has been an honorary lecturer for many organizations, and was invited to give the Preston Wade Trauma Lecture at Cornell University in 2011, the Ben Bryer Lecture at Mount Sinai Medical Center in 2012, the Kathryn D. Anderson Honorary Lecture at Georgetown University in 2013, the Frank B. Cerra Lecture in Critical Care Medicine in 2013, and the Roger Sherman lecture at the Southeastern Surgical Congress in 2014.

She received the 2002 Association of Women Surgeons Distinguished Member Award, awarded to a member that exemplifies the ideals and mission of the association. Additional honors include Surgical Critical Care Educator of the Year Awards in 1998, 1999, and 2000 and Surgery Teacher of the Year Awards in 1999 and 2001 from the University of Maryland. She received the Surgical Critical Care Fellowship Teacher of the Year Award in 2007 from University of Michigan. She received the William Coon Award (Presented by the surgery residents to the general surgery faculty member who best demonstrates that combination of clinical skill, concern for patients, and commitment to the education and well-being of residents that endears Dr. Coon to the house staff) in 2013.

She has been a mentor to a number of research fellows at the surgical resident and fellow level. Her research group has received numerous awards, including the annual Resident Paper Competition of the ACS Committee on Trauma, SCCM Best Paper awards, and numerous others. Dr. Napolitano has authored over 200 peer-reviewed publications, and over 90 book chapters, and has been an invited lecturer at many national and international symposia and a Visiting Professor at many institutions over the course of her career.



Jonathan M. Rubin, MD, PhD

Jonathan M. Rubin, MD, PhD

jonathan m. rubin, md, phd

Professor, Radiology
Section Head for Ultrasound and Abdominal Interventional Radiology



Jonathan M. Rubin received a B.A. in Chemistry from the University of Utah in 1969.  He received his M.D. from the University of Chicago Pritzker School of Medicine in 1974, and his Ph.D. in Biophysics and Theoretical Biology from the University of Chicago in 1977.  From 1979-1984, Dr. Rubin was the director of the Section of Body Computed Tomography and Ultrasound Imaging in the Department of Radiology at the University of Chicago.

He has been at the University of Michigan since 1984 where he is now a Professor of Radiology and the Section Head for Ultrasound and Abdominal Interventional Radiology.  His research interests include ultrasound blood volume flow measurement, ultrasound perfusion imaging, ultrasound artifacts, elasticity imaging, and photoacoustic imaging.

He has over 200 peer-reviewed publications, over 125 invited presentations, and 10 patents.  He was awarded the U of M Medical School Innovation Award in 2005, American Institute of Ultrasound in Medicine Joseph H. Holmes Clinical Pioneer Award in 2007, and Society of Radiologists in Ultrasound Lawrence Mack Lifetime Achievement Award in 2011.

Ashok Srinivasan, MBBS

Ashok Srinivasan, MBBS

ashok srinivasan, MBBS

Associate Professor, Radiology
Director, Neuroradiology



Dr. Srinivasan went to medical school in Chennai, India and pursued radiology residency at the All India Institute Medical Sciences in New Delhi. Subsequently, he did a Neuroradiology fellowship at the University of Ottawa in Canada and then joined as faculty at the University of Michigan in Ann Arbor, USA.

He is presently Director of the Neuroradiology division and Associate Professor of Radiology at the University of Michigan. He received the RSNA research scholar award from 2008-2010 for his project titled ‘Creation of prediction model for response to chemoradiation in head and neck squamous cell carcinoma’. He is actively involved in many research projects involving advanced imaging technologies such as diffusion and perfusion imaging.

He has published over 60 papers, written 8 book chapters and presented over 90 scientific or educational presentations at national and international conferences. He is a frequent speaker at national radiology and neuroradiology conferences in the US including the American Roentgen Ray Society and the American society of Head and Neck Radiology. Dr Srinivasan has received several awards for his presentations as well as reviewer recognition awards. He presently serves on the editorial board on the Head and neck section of two premier radiology journals “Radiology” and “European Radiology”.


Ashish P. Wasnik, MD

Ashish P. Wasnik, MD

Ashish P. Wasnik, MD

Wasnik A.jpg

Associate Professor, Radiology


Dr. Wasnik completed his radiology residency from King Edward Memorial Hospital, Mumbai, India. He served as a radiology faculty at Grant Medical College, India before moving to University of Michigan. He is a fellowship trained Abdominal Radiologist certified by the American Board of Radiology.

His primary area of research includes imaging and management of ovarian and adnexal masses, bowel imaging (Post-operative and inflammatory bowel diseases), Ultrasound in liver imaging/HCC screening, and transplant imaging. Dr. Wasnik is also actively involved in medical student education.

He has published over 60 papers and several book chapters. He has presented more than 100 scientific or educational presentations at national and international conferences, receiving over 30 awards. He serves on several committees in the national societies- Radiological Society of North America, Association of University Radiologists, American College of Radiology, American Board of Radiology, Society of Abdominal Radiology. He has presented over 50 invited national and international lectures. He also serves as Deputy Editor of Academic Radiology journal.