RadNet has been a national leader in providing high-quality, cost effective diagnostic and imaging services for over 35 years. With 340 owned and operated outpatient facilities across 6 states, RadNet performs more than 7 million imaging exams annually, providing advanced imaging modalities, subspecialty expertise, technological innovations, cutting-edge equipment and current research.

RadNet was one of the first radiology practices in the United States to establish a dedicated Prostate Program. Under the stewardship of co-directors Dr. Robert Princenthal and Dr. Martin Cohen, the RadNet Prostate Program has performed more prostate MRI exams than any group in the country, with a level of accuracy that meets or exceeds top academic centers worldwide. This level of knowledge and insight results in accurate, relevant and clinically significant reports for patients and their doctors.

The TULSA-PRO Program at RadNet is offered in a newly constructed state-of-the-art treatment room with a full critical care nursing staff, anesthesiologist, MRI technologist, Radiologist-Urologist team and a clinical scientist from Profound/TULSA-PRO. Urologists are invited to either train to perform the TULSA-PRO procedure alongside Dr.’s Princenthal and Cohen, or participate in a hybrid model wherein they can still oversee and monitor their patients throughout the treatment cycle.

RadNet remains dedicated to advancing early detection of disease and to empowering patients to take charge of their health.


Center address

23115 Sherman Pl, West Hills, CA 91307, United States



Call: (818) 480-7266

Contact Radnet’s Liberty Pacific West Hills Facility

Treatment team


Robert Princenthal, Md

Robert Princenthal, MD, is a board-certified radiologist with more than 25 years of experience. He is president and founding partner of Rolling Oaks Radiology, a network of outpatient imaging centers in Ventura County and also serves as the Medical Co-Director for RadNet’s Prostate MRI Program. This program is one of the most robust prostate MRI practices in the nation, of which Dr. Princenthal has been instrumental in establishing.


Martin Cohen, Md

Martin Cohen, MD, is the co-director of our Prostate MRI Program. Dr. Cohen has more than 25 years of experience as a radiologist and practices out of Southern California, primarily with Rolling Oaks Radiology. Dr. Cohen received his medical degree with highest honors from the Honors Program in Medical Education at Northwestern University in Chicago. He stayed on at Northwestern where he completed his residency in CT, MRI, general radiology and ultrasound. He was selected to be Chief Resident for the program during his final year. He received advanced training from the University of California, San Diego as a fellow in Sectional Imaging and Interventional Radiology. Additionally, Dr. Cohen completed a PET Mini Fellowship at the University of California, Los Angeles.


Ali Afshar, Md

Ali Afshar, MD, is an expert in robotic surgery with advanced training in complex urologic cancer surgery as well as minimally invasive techniques. He currently practices out of San Fernando Valley Urological Associates offices in Tarzana and West Hills.

Dr. Afshar completed his urology residency at Cedars-Sinai Medical Center and continued his training with a fellowship in advanced endourology and robotic surgery at the world-renowned USC Norris Comprehensive Cancer Center at the University of Southern California.


Daniel Brison, Md

Daniel Brison, MD, is a board certified urologist who completed medical school at the State University of New York, residency at UMDNJ, and fellowship at UCLA Geffen School of Medicine. He now practices as a part of Facey Medical Group.


Mayank Patel, Md

Mayank Patel, MD, was born and raised in Lusaka, Zambia, and then moved to the United States to pursue his formal education. He earned his undergraduate degree at Boston University before earning his medical degree at Tufts University School of Medicine in Boston. Dr. Patel completed an internship in general surgery and then began his urology residency at UCLA. He also earned the prestigious Willard E. Goodwin Resident Teaching Award. Dr. Patel’s clinical interests include urological cancers and robotic urological surgery. Dr. Patel now practices with Genesis Healthcare.


Y. Mark Hong, Md

Y. Mark Hong, MD, specialized in minimally invasive surgery at Integrative Urology, a new practice started by Dr. Hong. Dr. Hong prides himself on providing the highest level of service to his patients and adopts a holistic approach to urology. Dr. Hong practices in Phoenix, Arizona.


Kia Michel, MD

Kia Michel, MD, is a founding member of Comprehensive Urology in the Beverly Grove Community of Los Angeles. He is a leading figure in prostate cancer therapy, benign prostatic hyperplasia (BPH), female urology, urological cancers, urinary disorders, incontinence, erectile dysfunction, sexual dysfunction, stone diseases, and anti-aging. He utilizes state-of-the-art treatments and diagnostics like MRI fusion biopsy, HIFU, TULSA-PRO, robotic surgery, and vaginal surgery. Dr. Michel is eager to apply his expertise and help his patients resolve their issues and stay healthy.


Gary Bellman, MD

Gary Bellman, MD, founder of the Southern California Urology Institute, is a board-certified urologist with more than 25 years of experience in surgical procedures, with a specialty in minimally invasive surgery employed for delicate urologic treatment. Dr. Bellman has the distinction of receiving: “Top Urologist in Los Angeles”, “America’s Leading Experts”, “Patients’ Choice Award”, “Compassionate Doctor Award” for many years running, and “2018 Best of West Hills Doctor Award”.

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