Dr. Momenin is certified in diagnostic radiology by the American Board of Radiology with subspecialty training in abdominal imaging. He received his medical degree from Shahid Beheshti University of Medical Sciences in Tehran. He completed transitional year internship and diagnostic radiology residency at Wayne State University in Detroit, Michigan. Then completed abdominal imaging fellowship at Cleveland Clinic in Ohio. After fellowship Dr. Momenin has been assistant professor of radiology in the abdominal section of academic institutions; University of California, Davis Medical Center and University Hospitals of Cleveland/Case Western Reserve University.

Dr. Momenin currently is an assistant professor of radiology in the body section of department of radiology at keck school of medicine at the university of southern California. He attends on the abdominal imaging services at the Los Angeles County-USC hospital, Norris Cancer Center, and Keck Medical Center.

His primary duties include interpretation abdominal imaging studies (CT, MRI, and plain film radiographs), interpretation ultrasound examinations (head/neck, soft tissues, abdominal, and pelvic, as well as contrast-enhanced ultrasound), performing Gastrointestinal and Genitourinary fluoroscopic studies, ultrasound and CT guided procedures. Also, he involves in mentoring and teaching fellows, residents, and medical students on service. In addition, his research interests focusing on gastrointestinal, genitourinary, and oncologic imaging. He has presented his research at national and international meetings including Radiological Society of North America and American Society of Emergency Radiology from which he has received honors such as Roentgen Resident/Fellow Research Award from RSNA.