Doctors
Providers

All of our providers are skilled, fellowship-trained subspecialists who have received their instruction at prestigious medical institutions throughout the United States.

Our radiologists meet or exceed the ACR requirements for accreditation. We participate in the ACR RadPeer program and consistently surpass the national standard for quality; our Peer Review program is held as the gold standard in our state. We meet twice a month to review any case that is submitted to us by our referring providers, clinical facilities, Nightshift Radiology, or by the Oregon Heart and Vascular Institute, (OHVI) panel. RAPC not only participates in the ACR Rad Peer program but we also send random studies for QA purposes. RAPC also acts as a review panel for studies sent to us to evaluate quality of other radiologist and radiology practices.

All Radiology Associates providers are licensed to practice medicine in the States of Oregon, Alaska, and Washington. All are certified by the American Board of Radiology.

The team includes:

Dohrman

John Dohrman, MD

Nuclear Imaging

Dr. John Dohrman specializes in Nuclear Imaging. He graduated from the University of Iowa Medical School in 2002. He completed his radiology residency at Indiana University Medical Center, where he also completed a fellowship in nuclear medicine. Dr. Dohrman joined Radiology Associates in July 2008.

Ekstrom

Jon Ekstrom, MD

Women’s Imaging, Musculoskeletal, Pediatrics

Dr. Jon Ekstrom specializes in Women’s Imaging, Musculoskeletal and Pediatric radiology. He studied medicine at Oregon Health Sciences University in Portland. He had a fellowship at the University of Washington, specializing in MRI, CT and ultrasound. Dr. Ekstrom also completed a Pediatric Radiology residency at University of Colorado in Denver. Dr. Ekstrom joined Radiology Associates in July 1989.

Garbett

Donald Garbett, MD

Vascular, Interventional

Dr. Donald Garbett specializes in Vascular and Interventional radiology. He studied medicine at University of Illinois in Chicago. He completed his Radiology residency at Aurora St. Luke’s in Milwaukee and topped off his preparations with a fellowship in Vascular Interventional Radiology at Indiana University. Dr. Garbett joined Radiology Associates in February 2017.

Gunderman

Robert Gunderman, MD

Body Imaging, Women’s Imaging

Dr. Robert Gunderman specializes in Body Imaging and Women’s Imaging. He received his medical degree from the University of Cincinnati in 1979 and completed his residency in 1983 at Indiana University Medical Center with an emphasis on interventional radiology and ultrasound. Dr. Gunderman joined Radiology Associates in June 2004.

Gupta

Akshay Gupta, MD

Neuroradiology

Dr. Akshay Gupta specializes in Neuroradiolgoy. He completed his undergraduate education at Duke University and medical education at Louisiana State University. After residency at Tulane University he completed a two-year neuroradiology fellowship at the University of Utah. Dr. Gupta joined Radiology Associates in July 2005.

Ingalls

Jerrell Ingalls, MD

Musculoskeletal, Women’s Imaging

Dr. Jerrell Ingalls specializes in Musculoskeletal and also works in Women’s Imaging. He did his undergraduate work at Louisiana State University and went to medical school at Baylor College of Medicine in Houston, Texas. He completed his residency at Michigan State University and a fellowship at the University of Cincinnati. Dr. Ingalls joined Radiology Associates in August 2015.

Isuani

Bernie Isuani, MD

Vascular, Interventional

Dr. Bernie Isuani specializes in Vascular and Interventional radiology. He received his medical degree from the University of Texas and completed his radiology residency at Vanderbilt University Medical Center in Nashville, Tennessee. He received an additional year of training in vascular and interventional radiology at the University of Utah. Dr. Isuani joined Radiology Associates in December 2004.

Orton

Corey Orton, MD

Body Imaging and Interventional

Dr. Corey specializes in Body Imaging and Interventional radiology. He attended college and medical school at Emory University. He completed his residency at the University of Mississippi Medical Center in Jackson, and then returned to Emory for a fellowship in abdominal imaging. Dr. Orton started work at Oregon Imaging Centers in July 2016.

Pak

Marius Pakalniskis, MD

Musculoskeletal Imaging

Dr. Marius Pakalniskis specializes in Musculoskeletal Imaging. He studied medicine at Dartmouth’s Geisel School of Medicine in New Hampshire and did an internship at Resurrection Medical Center in Chicago, a residency at University of Iowa Hospitals and Clinics in Iowa City, and a fellowship in musculoskeletal imaging at the University of Washington Medical Center in Seattle. Dr. Pakalniskis joined Radiology Associates in July 2016.

Schabel

Alex Schabel, MD

Neuroradiology

Dr. Alex Schabel specializes in Neuroradiology. He earned his medical degree from the University of Wisconsin in 2006 and completed an internship in general surgery at the University of Washington and a radiology residency and neuroradiology fellowship at the University of Utah. Dr. Schabel joined Radiology Associates in July 2013.

Sims

Jonathan Sims, MD, MBA, FF-L1

Women’s Imaging, Musculoskeletal

Dr. Jonathan Sims specializes in Women’s Imaging and Musculoskeletal radiology. He received his medical degree and MBA from the University of South Florida, where he also completed his residency and internship. In 2007, he completed his fellowship in musculoskeletal MRI. Dr. Sims joined Radiology Associates in July of 2008.

Thiede

Stephan Thiede, MD

Neuroradiology

Dr. Stephan Thiede specializes in Neuroradiology. He received his medical degree and completed a radiology residency at the University of North Carolina, Chapel Hill. He also completed a two-year neuroradiology fellowship at the University of Utah. Dr. Thiede joined Radiology Associates in July 2005.

Tsai

David Tsai, MD

Musculoskeletal, Trauma

Dr. David Tsai specializes in Musculoskeletal and Trauma radiology. He received his medical degree from the University of Missouri-Kansas City. He trained in diagnostic radiology at the University of Miami/Jackson Memorial Medical Center. Dr. Tsai completed his fellowship training at Washington University’s Mallinckrodt Institute of Radiology in musculoskeletal imaging. He also completed a second fellowship at University of Washington, Harborview Medical Center in Trauma and Emergency Imaging. Dr. Tsai joined Radiology Associates in July 2005.

Wilson

Paul Wilson, MD

Vascular, Interventional

Dr. Paul Wilson specializes in Vascular and Interventional radiology. He received his medical training in Portland at the former University of Oregon Medical School – now Oregon Health and Science University. After medical school he completed a fellowship program at University of California, San Diego, in ultrasound, CT and angiography. Dr. Wilson has been instrumental in developing interventional and angioplasty services in the Northwest. He joined Radiology Associates in July 1979.

Young

Erik Young, MD, Ph.D.

Body Imaging

Dr. Erik Young specializes in Body Imaging. He has a doctorate in theoretical physics besides his medical degree from the University of Arkansas, where he also served his residency training. He did a radiology fellowship in body imaging at the University of California. Dr. Young joined Radiology Associates in July 2008.

Zawierucha

Dariusz Zawierucha, MD

Vascular, Interventional

Dr. Dariusz Zawierucha specializes in Vascular and Interventional radiology. He did his medical training at Stanford Medical School and completed his residency there in diagnostic radiology and fellowship in interventional radiology. Dr. Zawierucha joined Radiology Associates in October 2010.

Koehler

Thomas Koehler, PA-C

Physician Assistant

Tom Koehler received his degree in Biology from Lewis-Clark State College and continued his education at Fort Sam Houston near San Antonio, Texas. He came to us from The Dalles, Oregon where he worked as a Physician Assistant for an Orthopedic and Sports Medicine group. He continues to serve in the National Guard and has been with Radiology Associates since September 2015.

Maier

Chris Maier, PA-C

Physician Assistant

Chris Maier came to Radiology Associates from Florida, where he worked as a Physician Assistant for a gastrointestinal surgical oncology group and a dermatologic surgeon. The Northwest was not uncharted territory for him; he earned his BS in Physical Education, Health Sciences from Pacific Lutheran University in rainy Tacoma, before heading to Barry University where he earned his Master's in Clinical Medical Science and Physician Assistant studies. He joined Radiology Associates in 2016.

Olson

Jason Olson, PA-C

Physician Assistant

Jason Olson brings a comprehensive set of medical skills to Radiology Associates. He earned his BS in Exercise Science from Portland State University, and his MS in Physician Assistant Studies from Pacific University. His work experience includes urgent care and emergency settings in rural and metropolitan areas. He joined Oregon Imaging in 2016 after working at the Cottage Grove PeaceHealth walk-in clinic.