Our Physicians
The Radiology Group (TRG), LLC
The Radiology Group (TRG), LLC is the exclusive provider of physician services for the Center for Medical Imaging. TRG is one of the largest subspecialty radiologist physician groups in Oregon. TRG is composed of 28 radiologists, all of whom are fellowship-trained. This means that CMI has fellowship-trained radiologists in each of the subspecialty sections of diagnostic imaging and interventional radiology. Professional services with this level of clinical expertise and imaging technology are rarely seen outside of an academic environment. TRG physicians have been selected not only on the basis of their specialty training and board certification but also for their desire to practice in an environment where they can provide specialty consultation. As medical imaging leaders, TRG continually addresses the dynamic imaging requirements of the healthcare community.
The CMI Team of Radiologists

Darshan Acharya, MD
Neuroradiology, Head & Neck
Fellowship: Emory University
Residency: Memorial Health University Medical Center
Medical School: Medical College of Georgia

Lee Ball, MD
Pediatrics & Women's Imaging
Fellowship: Texas Children's Hospital
Residency: Baylor University
Medical School: Albany Medical College

Gregory Beagle, MD
Body Imaging & Women's Imaging
Fellowship: Oregon Health and Sciences University
Residency: University of Missouri, Kansas City
Medical School: Southern Illinois University School of Medicine

Jeffrey Bonham, MD
Musculoskeletal Imaging
Fellowship: University of California San Francisco
Residency: University of Chicago
Medical School: Northwestern University

Dr. Jeffrey R. Cagley
Neuroradiology
Fellowship: University of Wisconsin
Residency: Oregon Health & Sciences University
Medical School: University of Iowa Carver School of Medicine

Crispin Chinn, MD
PET & Nuclear Medicine
Fellowship: Oregon Health and Sciences University
Residency: Oregon Health and Sciences University
Medical School: University of Washington

Anthony DiRe, MD
General Radiology
Residency: Oregon Health and Sciences University
Medical School: Georgetown University School of Medicine

William Fife, MD
Center for Medical Imaging Medical Director, Body Imaging & Women's Imaging
Fellowship: Los Angeles County University of Southern California Medical Center
Residency: Los Angeles County University of Southern California Medical Center
Medical School: Temple University

Thomas Gibson, MD
Neuroradiology & Women's Imaging
Fellowship: Oregon Health and Science University
Residency: Oregon Health and Science University
Medical School: Oregon Health and Science University

James Hazard, MD
Body Imaging & Women's Imaging
Fellowship: University of Virginia
Residency: Oregon Health and Sciences University
Medical School: University of California

Lloyd Heller, MD
Musculoskeletal & Body MRI
Fellowship: Hahnemann University
Residency: Medical College of Pennsylvania
Medical School: Hahnemann University Hospital

Jason B. Hobbs, MD
Women's Imaging
Fellowship: Mallinckrodt Institute of Radiology at Washington University
Residency: University of Colorado
Medical School: University of Texas

Ben Jacobson, MD
Neuroradiology, Head & Neck
Fellowship: University of California, Los Angeles
Residency: University of Arizona, Diagnostic Radiology
Medical School: Oregon Health and Sciences University

Yilun Koethe, MD
Interventional Radiology
Fellowship: University of Florida
Residency: University of California, San Francisco
Medical School: Duke University

Charles Kosydar, MD
Body Imaging & Emergency Radiology
Fellowship: Stanford University
Residency: Virginia Mason
Medical School: Oregon Health and Sciences University

Justin LaPlante, MD
Neuroradiology & Emergency Radiology
Fellowship: University of Utah Health Sciences Center
Residency: University of Utah Health Sciences Center
Medical School: Virginia Commonwealth University

Will Larison, MD
Abdominal Imaging
Fellowship: University of Wisconsin
Residency: University of Wisconsin
Medical School: Oregon Health and Science University

Felix Nautsch, MD
Interventional Radiology
Fellowship: Yale | New Haven, CT
Residency: Yale | New Haven, CT
Medical School: New York Medical College

Joao Prola Netto, MD
Neuroradiology
Fellowship: Oregon Health and Science University; University of Maryland Medical Center
Residency: Federal University of Sao Paulo
Medical School: Federal University of Health Sciences of Porto Alegre

Dr. Karen Y. Oh
Breast & Women's Imaging
Fellowship: University of California Los Angeles, University of Utah
Residency: University of Utah
Medical School: Mayo Medical School

Jason. M Polder, MD
Neuroradiology
Fellowship: University of Utah Health Sciences Center
Residency: University of Pittsburgh Medical Center
Medical School: The Ohio State University College of Medicine

Piper Rooke, MD
Body Imaging, Emergency Radiology
Fellowship: Mayo Clinic, Jacksonville, FL
Residency: University of Florida College of Medicine
Medical School: University of Florida College of Medicine

J. Tyler Thiesing, MD
Interventional Radiology & Neurointernventional Radiology
Fellowship: Dotter Interventional Institute at Oregon Health and Science University
Residency: Oregon Health and Sciences University
Medical School: Oregon Health and Sciences University

Ben A. Varughese, MD
Interventional Radiology
Fellowship: University of Washington
Residency: Baylor College of Medicine
Medical School: Baylor College of Medicine

Amy Weinstein, MD
Women's Imaging
Fellowship: University of California San Francisco
Residency: University of California San Francisco
Medical School: Oregon Health and Sciences University

Joseph Whetstone, MD
Cardiothoracic Radiology
Fellowship: Oregon Health and Sciences University
Residency: Oregon Health and Sciences University
Medical School: University of Pittsburg

Kevin Wiesmann, MD
Body Imaging & Intervention
Fellowship: Harvard Medical School
Residency: Mayo Clinic
Medical School: University of California - Davis

Stephen Zinck, MD
Thoracic Imaging
Fellowship: Stanford University
Residency: Oregon Health and Sciences University
Medical School: University of California, Davis