Our Physicians

Our Radiologists

Donald H. Breit, M.D.
Dr. Breit is a graduate of the University of South Dakota School of Medicine where he was a member of the Alpha Omega Alpha honor society and the recipient of several scholarships and memorial awards. He has received his Radiology Residency training at University of Missouri Hospital & Clinics. Dr. Breit is Board Certified by the American Board of Radiology, and his areas of special expertise include mammography, MRI, CT, ultrasound and general diagnostic radiology. He joined LRG as a Diagnostic Radiologist in 1996.
Jason P. Cassidy, M.D.
Dr. Cassidy is a graduate of University of Iowa College of Medicine. Following graduation he completed his Radiology Residency at the University of Kansas. Dr. Cassidy is Board Certified by the American Board of Radiology. His areas of special expertise include Body Imaging, Ultrasound, Mammography and Nuclear Medicine. He joined LRG as a Diagnostic Radiologist in 2008.
Jonathan D. Fullner, M.D.
Dr. Fullner is a graduate of the University of Nebraska College of Medicine. He completed an internship in Internal Medicine at the University of Nebraska Medical Center in Omaha, NE. He completed his diagnostic radiology residency at the Creighton University Medical Center in Omaha, NE. He completed a fellowship in neuroradiology at the Barrow Neurological Institute in Phoenix, AZ. His areas of special expertise include all modalities of neuroradiology, body imaging and nuclear medicine. Dr. Fullner joined LRG in 2018.
Janet C. Matthes, M.D.
Dr. Matthes is a graduate of the University of Nebraska College of Medicine. Following graduation she completed a Radiology Residency and Magnetic Resonance Imaging Fellowship at University of Texas Health Science Center in San Antonio, TX. She is Board Certified by the American Board of Radiology, and her areas of special expertise include CT, MRI, bone densitometry, mammography and ultrasound. She joined LRG as a Diagnostic Radiologist in 1991.
Juris L. Purins, M.D.
Dr. Purins performed his Internal Medicine Residency at Abbott Northwestern Hospital in Minnesota. He completed his Radiology Residency at Wilford Hall USAF Medical Center in San Antonio, Texas. Dr. Purins was also fellowship trained in Musculoskeletal Radiology at the University of Mississippi. His areas of special expertise include Musculoskeletal Radiology, CT Guided and Interventional Radiology procedures. He joined LRG as a Diagnostic Radiologist in 2008.
Eric M. Williams, M.D.
Dr. Williams is a graduate of the University of Nebraska College of Medicine. Following graduation he received his Radiology Residency training and served as Chief Resident at St. Elizabeth Hospital Medical Center through Northeast Ohio Universities College of Medicine in Youngstown, OH. Dr. Williams performed his Cross-Sectional Imaging CT/MRI/US Fellowship at Henry Ford Hospital in Detroit, MI. He is Board Certified by the American Board of Radiology and his areas of special expertise include PET Imaging, CT, MRI, ultrasound, Cross-Sectional Imaging, CT virtual colonography and mammography. He joined LRG as a Diagnostic Radiologist in 1989.
Douglas J. Winjum, M.D.
Dr. Winjum is a graduate of the Creighton University School of Medicine. Following graduation he completed a Radiology Internship and Residency at Michigan State University/GRAMEC in East Lansing, MI. He is active on committees at BryanLGH Medical Center, currently serving as the Medical Director of Radiology. Dr. Winjum is Board Certified by the American Board of Radiology. His areas of special expertise include CT, MRI, ultrasound and CT angiography. He joined LRG as a Diagnostic Radiologist in 1998.