Director of Imaging Services
Charles E. Fiske, M.D.

Charles E. Fiske, M.D. graduated from the UCLA School of Medicine and trained in Internal Medicine at the University of California Los Angeles. He did his Radiology Residency at the University of California San Francisco School of Medicine where he served as Chief Resident. He completed a Fellowship in body imaging at UCSF. He is Board Certified in Radiology and an Assistant Clinical Professor of Radiology at UCSF.

Dr. Fiske is a member of the medical staff at the John Muir Mt. Diablo Medical Center where he has practiced office-based out patient diagnostic imaging for 15 years. He is a member of the medical staffs of the San Ramon Regional Medical Center and Summit Medical Center.
Dr. Fiske authored numerous scientific journal and health care policy articles and serves on the editorial advisory board for Diagnostic Imaging magazine.

PET Medical Director
Patrick J. Perkins, M.D.

Dr. Perkins, Medical Director of the Pacific Imaging PET Center, has been Director of Nuclear Medicine at Summit Medical Center since 1978. He graduated from the University of Cincinnati College of Medicine and interned at San Francisco General Hospital. A residency in diagnostic radiology was completed at the University of Cincinnati, followed by a fellowship in Nuclear Medicine at the University of Cincinnati. Dr. Perkins is a Diplomate of both the American Board of Radiology and the American Board of Nuclear Medicine. He brings complimentary expertise in cross sectional imaging and in-depth experience in functional imaging. Dr. Perkins has greater than four years of extensive experience in both general nuclear medicine and PET scanning.

Imaging Center Manager
Sherry L. Clark, CRT, CNMT

Sherry L. Clark has been at Pacific Imaging since 1973. She has over 30 years of experience working in the Diagnostic Imaging field. She completed her training at UCLA School of Health Sciences in 1970. After working in San Francisco for three years,
Ms. Clark moved to Walnut Creek and worked primarily as a nuclear medicine technologist. She is certified and proficient in nuclear medicine, MRI, diagnostic X-rays and bone density screening. During the past four years, she gained PET scanning experience at Pacific Imaging's PET Center in Oakland. Ms. Clark has been the Walnut Creek facility's Imaging Center Manager for the past seven years.

Pacific Imaging
Full Modality Imaging
and PET / CT Center at Walnut Creek
114 La Casa Via, 100 and 200
Walnut Creek, CA 94598
Main Phone: 925-937-6100
Main Fax: 925-947-6607

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