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Diagnostic Radiology Residency Program

Program Director: John Sohn, MD
Residency Coordinator: Erika Coleman
Telephone: 909-580-6276
Address: Department of Medical Imaging, 400 N. Pepper Ave., Colton, CA 92324

The Diagnostic Radiology program at Arrowhead Regional Medical Center (ARMC) is accredited by the Accreditation Council on Graduate Medical Education (ACGME). In August 2021, the program received initial accreditation status by the Accreditation Council for Graduate Medical Education (ACGME).

The mission of the ARMC Diagnostic Radiology Residency program is to provide outstanding educational opportunities to residents through innovative teaching, clinical training, and exposure to quality, and leadership initiatives for the purpose of enabling our trainees to become outstanding providers of clinical radiology in independent practices and academic medicine. Our trainees and graduates will serve diverse populations, from small community practices to large metropolitan academic centers. Our mission aligns with Arrowhead Regional Medical Center's goal of improving health care in our community, state, and nation by providing safe, high-quality, and innovative care, both now and into the future.

The overall goals of the ARMC Diagnostic Radiology Program are to train physicians to be competent in the basic knowledge, technical skills, and attitudes necessary to function as physicians in Diagnostic Radiology. Graduates will have the ability to supervise, advise on and perform imaging procedures to such a level of competence and across a broad range of medical practice, as to function as a consultant to referring physicians. The graduate will have a foundation for a career built on continuous learning and recognition of the importance of communication, interdisciplinary collaboration, research and professional attitudes and respect. The program is designed to meet the specifications of the American Board of Radiology.

Arrowhead Regional Medical Center (ARMC) is the primary teaching site and sponsoring institution for the Diagnostic Radiology Residency Program. ARMC is a 456-bed university-affiliated tertiary care teaching hospital owned and operated by the County of San Bernardino. ARMC is one of 13 safety-net hospitals in California, and serves the medically indigent, diverse population in the Inland Empire.

ARMC is a regional burn center, a comprehensive stroke center that treats over 1,000 patients annually, and a trauma center that treats 2,500 patients annually. ARMC receives over 130,000 adult and children visits with over 25,000 admissions and over 254,000 outpatient visits annually. ARMC has 366 hospital inpatient beds, a 90-bed behavioral health center located on the hospital campus, multiple primary care centers, and provides more than 40 outpatient specialty care services. This primary site has 24/7 in-house faculty coverage, support and supervision to the residents.

ARMC supports seven ACGME accredited residency programs (Diagnostic Radiology, Emergency Medicine, Family Medicine, Internal Medicine, General Surgery, Ob/Gyn, Psychiatry) along with four fellowships (Emergency Medical Services, Maternal Fetal Medicine, Pulmonary Critical Care Medicine and Surgical Critical Care). ARMC’s diverse patient population, pathology, high patient census and institutional commitment to education and community service provides residents with excellent opportunities for learning and growth and assures the residents receive training of sufficient scope and volume in all the required categories. Residents will be exposed to a great volume and wide variety of pathology and disease processes due to the diverse and underserved patient population the hospital is committed to serving. There are sufficient qualified faculty members participating in the training and providing supervision to the residents. There is 24/7 faculty coverage either in person or through teleradiology for the residents. The program is structured to provide an optimal, progressive clinical environment for all trainees.


Lectures and conferences are typically held during noon time each day. During this time, residents are excused from clinical duties to attend lectures. Topics include core curriculum lectures, case conferences, tumor board, and multidisciplinary conferences. Residents are encouraged to present journal articles as well as interesting cases they have found.

Each resident is afforded separate dedicated research rotations. This research time is dedicated to the research project of one's choosing and must be spent on campus engaged in active research. A publication/poster presentation grade research project or approved structured quality improvement project is required for graduation from the program.

Application Resources for Diagnostic Radiology Residency

All applications to the Arrowhead Regional Medical Center Diagnostic Radiology Residency Program are filled through The National Resident Matching Program, commonly known as The Match. Applications are accepted exclusively through the Electronic Residency Application Service (ERAS).

ARMC Diagnostic Radiology Residency Program has a traditional advanced match starting in PGY2 July 2023. The Diagnostic Radiology Residency program will participate in a traditional Advanced match starting as a PGY2 in July 2023. The prerequisite year may be in any accredited preliminary position such as medicine, surgery or a transitional year.

All applications for open radiology residency positions are reviewed in their entirety. Qualifying applicants who are invited for interviews will be contacted via ERAS with details.

This program is listed on NRMP as:

Arrowhead Regional Medical Center