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Diagnostic Radiology Residency Program

Program Director: John Sohn, MD
Residency Coordinator: Amanda Dannoun, MPH
Telephone: 909-580-2488
Address: Department of Medical Imaging, 400 N. Pepper Ave., Colton, CA 92324

Mission and Aims

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.

Program Goal

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 eight ACGME accredited residency programs (Diagnostic Radiology, Emergency Medicine, Family Medicine, Internal Medicine, Surgery, Ob/Gyn, Psychiatry, and Neurology) along with five fellowships (Cardiovascular Disease, Emergency Medical Services, Maternal Fetal Medicine, Pulmonary Disease and 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.

Resident Eligibility and Selection


The selection process is designed to be consistent and fair, based upon academic credentials, letters of recommendation and personal interview. The program leadership reviews each completed applicant file in their entirety and makes the decision as to who will be invited for an interview.

The program participates in the National Resident Matching Program (NRMP) and uses the Electronic Residency Application Service (ERAS).

The program uses Thalamus as a platform to offer, schedule, and manage interview dates.

You will create a profile within Thalamus to accept an interview offer, this cannot be done until you are offered your first interview.

The Thalamus Applicant User Guide will assist you in setting up an account.

We will notify you by email from Thalamus about whether or not we are able to offer you an interview.

Set as a trusted account in your email to ensure this does not go to your spam folder.

Additional Information about the Supplemental Application

For the 2023 ERAS® cycle, our program will collect and review data from applicants’ supplemental ERAS applications. Completion of the standard MyERAS application is a requirement. Completion of the supplemental ERAS application is optional. The supplemental ERAS application is designed to help applicants share more information about themselves and assist our program in finding applicants that fit our program’s setting and mission. There is no cost to applicants and participation is optional.

The supplemental ERAS application provides:

  • Geographic preferences (by division and by urban or rural setting);
  • Information about an applicant’s most meaningful experiences and other impactful life events, if applicable; and
  • Program signals.

Prerequisite Clinical Year

All applicants must satisfy the prerequisite clinical year training established by the ACGME Diagnostic Radiology Review Committee prior to beginning training in the ARMC Diagnostic Radiology Residency Program. The prerequisite year may be in any accredited preliminary position such as medicine, surgery, or a transitional year.

Resident applicants must meet the following qualifications for appointment to the Neurology Residency Program:

  1. Graduates of Medical Schools in the U.S. and Canada accredited by the Liaison Committee on Medical Education (LCME), or
  2. Graduates of Colleges of Osteopathic Medicine in the United States accredited by the American Osteopathic Association (Commission on Osteopathic College Accreditation), or
  3. Graduates of Medical Schools outside the United States and Canada who have received a currently valid certificate from the Educational Commission for Foreign Medical graduates prior to appointment.


  • Completed ERAS Application
  • Medical School Transcript
  • USMLE scores
  • Dean’s Letter
  • Three (3) letters of recommendation
  • Curriculum Vitae
  • Personal Statement

Additional International Medical Graduate (IMG) Information

  • Must have graduated from medical school within the last two years
  • Valid ECFMG Certificate prior to appointment, if applicable
  • Minimum six months clinical experience in US (research, observership, or shadowing not considered as clinical experience)
  • We DO NOT sponsor any Visas

Applicants will be invited for interviews in October, November, and December.

This program is listed on NRMP as:
Arrowhead Regional Medical Center
NRMP Program Code: 1047420A0