— our doctors

Roman Hystad Keller, D.O.

Dr. Keller joined RDR in July 2010 as a Musculoskeletal Radiologist and is certified by the American Board of Radiology. His professional interest and expertise include general and musculoskeletal radiology.

Professional Expertise


Muskuloskeletal Radiology, Ohio State University


Diagnostic Radiology, The University of Oklahoma Health Sciences Center

Osteopathic Medical Degree

Kansas City University of Medicine and Biosciences

Undergraduate Degree

Bachelor of Science in Chemistry and Biology, Mount Mercy College, Cedar Rapids, Iowa


American College of Radiology
Radiological Society of North America
Society of Skeletal Radiology
Minnesota Radiologic Society

Committed to Providing Personalized Care

"I'd like to share how pleased I was with Dr. Nguyen's service in the middle of the night. I felt my patient needed an emergent MRI and I found him to be very friendly, helpful and willing to do whatever was best for the patient. The MRI was done with no hassle and both the patient and I were very pleased with the service."

Referring Physician

"Thank you for performing my recent biopsy so carefully. Dr. Bolton Smith kept me well informed during the entire procedure and I wanted to let her know how much I appreciate it."

RDR Patient

"Thank you so much, Dr. Brindley, for your help and patience during a difficult time. You were very calm and very respectful of everyone throughout the evening. We truly appreciate it."

Patient Family Member

"My radiologist was very kind when visiting with me to review my preliminary results. Everything was explained clearly and questions were encouraged. I really appreciate that there was a provider on site to quickly review the images. This alleviated a lot of the anxiety inherent to some of the testing done there."

RDR Patient

"Dr. Spoden was very concerned with my comfort and was extremely helpful in getting me on and off the table. He was wonderful and pleasant to be around. Dr. Spoden also took the time to very clearly explain his evaluation of the images."

RDR Patient

I was recently seen by Dr. Spoden and Dr. Bolton Smith for a procedure and I wanted to let you know how wonderful these two doctors are! I was scared! Scared of the unknown. They were both so kind and compassionate. I love that they tried to keep the conversation upbeat and positive. Even through my tears they managed to make me smile. The professionalism, kindness and caring they showed me will never be forgotten.

RDR Patient