Medical Team

Our board-certified radiologist physicians and technologists have the most advanced tools to provide diagnostic studies ranging from general X-ray and ultrasound to sophisticated nuclear medicine and magnetic resonance imaging (MRI).

Avanti Ambekar, M.D.

American Board of Radiology, 2006

Dr. Ambekar attended Northwestern University Medical School before completing her residency at the University of California, San Francisco (UCSF). She completed fellowships in both neuroradiology and musculoskeletal imaging at UCSF, where she also served as chief resident in the Department of Radiology.

Dr. Ambekar was board certified by the American Board of Radiology in 2006. She received her Certificate of Added Qualification in neuroradiology in 2008. She currently practices at Mills- Peninsula Medical Center. She also serves as clinical faculty in the Department of Radiology at University of California, San Francisco.

She is a member of the American Society of Head and Neck Radiology, the Radiological Society of North America and the American Society of Neuroradiology.

Dr. Ambekar has published in Osteoporosis International and the International Journal of Gynecology and Obstetrics. She has given numerous oral presentations at the annual meetings of the American Society of Spine Radiology, the American Society of Neuroradiology, and the American Society of Head and Neck Radiology.

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Diane B. Baker, M.D.

American Board of Radiology, 2002

Dr. Baker graduated from Stanford University School of Medicine in 1997. She completed her diagnostic radiology residency and fellowship in ultrasound at the University of California, San Francisco.

Education
M.D. - Stanford University School of Medicine, 1997
M.S. - Stanford University, Department of Biology, 1992
B.S. - Stanford University, Departmental Honors, 1991

Professional Training
Fellowship, Ultrasound - University of California at San Francisco (UCSF), 2002-2003

Residency
UCSF, 1998-2002

Internship, Internal Medicine
Stanford University Medical Center, 1997-1998

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Harriet Beth Borofsky, M.D.

American Board of Radiology, Diagnostic Radiology, 1993

Dr. Borofsky has been practicing with California Advanced Imaging Medical Associates since 1994. She also serves as the director of breast imaging at the Breast Center in San Mateo and on the visiting clinical faculty at Stanford University Medical Center's Department of Radiology. Dr. Borofsky has developed an expertise in breast imaging.

Education
M.D. - Harvard University Medical School, Boston, MA, 1988
B.A. - Brown University, Providence, RI, 1984

Professional Training
Fellowship, Body Imaging - Stanford University Hospital, 1993-1994
Fellowship, Mammography - Stanford University Hospital, 1992-1993

Residency, Diagnostic Radiology
Stanford University Hospital, 1989-1993

Chief Resident, Supervisory
Palo Alto Veterans Administration Hospital, Palo Alto, CA, 1990-1991

Internship, Internal Medicine
Kaiser Permanente Medical Center, Santa Clara, CA, 1988-1989

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Kelly C. Broderick, M.D.

American Board of Radiology, Diagnostic Radiology, 1997

Dr. Broderick is a board certified general radiologist specializing in breast imaging and ultrasound with Mills-Peninsula Health Services.

Education
M.D. - Harvard University Medical School, 1992
B.S. - Pennsylvania State University, University Park, PA, 1988

Professional Training
Clinical Instructor, General Radiology-Women's Imaging

Fellowship, Ultrasound
University of California, San Francisco (UCSF), CA, 1997-1998

Residency, Radiology
UCSF, San Francisco, CA, 1993-1997

Internship, Surgical and Medical
Newton-Wellesley Hospital, Newton, MA, 1992-1993

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Thomas Farquhar, M.D.

American Board of Radiology, Diagnostic Radiology,

Education
M.D. - University of California, Los Angeles (UCLA) School of Medicine, Los Angeles, CA, 2000
Ph.D - Biomedical Physics - UCLA School of Medicine, Los Angeles, CA, 1998
M.S. - Stanford University, Department of Electrical Engineering, 1992
B.S. with Distinction - Stanford University, Department of Electrical Engineering, 1992

Professional Training
Fellowship/Clinical Instructor, Magnetic Resonance Imaging
University of California, San Diego (UCSD) Medical Center, San Diego, CA, 2005-2006

Residency, Diagnostic Radiology
University of California, San Francisco Medical Center, San Francisco, CA, 2001-2005

Internship, Internal Medicine
UCLA San Fernando Valley Internal Medicine Program, Los Angeles, CA, 2000-2001

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Lenora Fung, M.D.

American Board of Radiology, Diagnostic Radiology

Education
M.D. - University of California, San Francisco (UCSF), 1970-1974
B.S. - University of California, Berkeley, 1966-1970

Professional Training
Internship - UCSF, 1974-1975

Residency, Diagnostic Radiology
UCSF, 1975-1977 (radiology)
UCSF, 1977-1980

Fellowship (CT/US)
San Francisco General Hospital, 1980-1981

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Brian L. Johnson, M.D.

American Board of Radiology, Diagnostic Radiology, 1980

Dr. Johnson has been on the staff at Mills-Peninsula Hospitals and San Mateo County General Hospital since 1980. He offers many years of clinical experience as well as leadership experience. He has served as medical director of the San Mateo Imaging Center (MRI) since its inception in 1985; medical director of the Department of Radiology, Peninsula Hospital since 1992; and medical director of the Mills-Peninsula Hospitals School of Radiologic Technology since 1994. He most recently served as the chairman of the Department of Radiology for Mills-Peninsula Hospitals from 1996 to 2000.

Dr. Johnson is a current avid tennis player and a former collegiate rower, having won a national rowing championship in 1971 followed by international competition as a member of the US Rowing Team. He currently lives in Hillsborough with his wife Joan and children.

Education
M.D. - Stanford University Medical School, 1976
B.S. - Harvard University, Boston, MA, 1971

Professional Training
Internship, Internal Medicine
San Francisco General Hospital, CA, 1976-1977

Residency, Diagnostic Radiology
University of California, San Francisco, CA, 1977-1980

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Arthur E. Li, M.D.

Education
M.D. - University of California, San Francisco, CA, 1999
A.B. - Harvard University, Magna Cum Laude in Biology, Boston, MA, 1994

Professional Training
Internship, Internal Medicine - Johns Hopkins-Sinai Hospital, Baltimore, MD, 1999-2000

Residency, Diagnostic Radiology
Johns Hopkins Hospital, Baltimore, MD, 2000-2004
Chief Resident, 2003

Fellowship, Musculoskeletal Imaging
National Orthopedic Imaging Associates, San Francisco, CA, 2004-2005

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Gregory M. Lim, M.D.

American Board of Radiology, Diagnostic Radiology, 1995

Dr. Lim, a San Mateo native, has enjoyed a distinguished career in radiology. He was selected nationally to receive the coveted Radiologic Society of North America Fellowship award and was named the Cesare Gianturco Fellow for 1996.

Education
M.D. - University of California, San Francisco, CA, 1989
M.A. - Stanford University, Stanford, CA, 1985
B.S. - Stanford University, Stanford, CA, 1985

Professional Training
Fellowship, RSNA - University of California, San Diego, CA, 1996-1997
Fellowship, Interventional Radiology, University of California, San Diego, CA, 1995-1996

Residency, Internship & Radiology
Virginia Mason Medical Center, 1989-1990

Research Fellowship
University of California, San Francisco, CA, June-August 1986

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David S. Marcus, M.D.

American Board of Radiology, Diagnostic Radiology, 1992

Dr. Marcus received his medical degree from the University of California, San Diego. After finishing an internship at Mercy Hospital in San Diego, he completed his radiology residency training at the University of Arizona. He then served as a clinical instructor and fellow at the University of California, San Francisco, where he focused his attention on magnetic resonance imaging, ultrasound and computed tomography. In addition to cross-sectional body imaging, Dr. Marcus has special interest and experience in performing interventional radiologic procedures. He has practiced radiology in the San Mateo area since 1993.

Education
M.D. - University of California, San Diego, CA, 1987
B.A. - University of California, Santa Barbara, CA, 1983

Professional Training
Fellowship, MRI/Ultrasound/CT - University of California, San Francisco, CA, 1992-1993

Residency, Diagnostic Radiology
University of Arizona, Tucson, AZ, 1988-1992

Internship, Transitional
Mercy Hospital, San Diego, CA, 1987-1988

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Kathleen M. McKenna, M.D.

American Board of Radiology, Diagnostic Radiology, 1993

Dr. McKenna completed radiology residency training and served as the chief
resident in diagnostic radiology at the University of California, San Francisco. She was clinical instructor for the department of radiology at the University of California, where she focused her attention on ultrasound. Dr. McKenna is the former president of the San Francisco Bay Radiology Society.

Education
M.D. - University of California, Los Angeles, CA, 1988
B.S. - University of California, Berkley, CA, 1984

Professional Training
Clinical Instructor, Ultrasound
University of California, San Francisco, CA, 1993-1994

Resident, Radiology
University of California, San Francisco, CA, 1992-1993

Internship, Internal Medicine
University of California, CA 1988-1989

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Clay Hughes Napper, Jr., M.D.

American Board of Radiology, Diagnostic Radiology, 1998

Dr. Napper received his radiology training at Stanford University, where he
specialized in body imaging, diagnostic radiology and radiation oncology.

Education
M.D. - Bowman Gray School of Medicine, Winston-Salem, NC, 1992
B.A. - Davidson College, Davidson, NC, 1985

Professional Training
Fellowship, Body Imaging
Stanford University, Stanford, CA, 1998-1999

Residency, Diagnostic Radiology
Stanford University, Stanford, CA, 1994-1998

Residency, Radiation Oncology
Stanford University Hospital, Stanford, CA, 1993-1994

Internship, Internal Medicine
Mount Zion Medical Center of the University of California, San Francisco, CA, 1992-1993

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Mark N. Pederson, M.D.

American Board of Radiology, Diagnostic Radiology, 1980

Dr. Pederson completed radiology fellowship in abdominal imaging at New York University.

Education
M.D. - University of Iowa, Iowa City, IA, 1972
B.S. - University of North Dakota, Fargo, ND, 1970

Professional Training
Fellowship, Abdominal Imaging, New York University, New York, NY, 1980-1981

Residency, Radiology
University of California, San Francisco, CA, 1977-1980

Internship, Mixed Medical
Washington Hospital Center, 1972-1973

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William M. Stephenson, M.D.

American Board of Radiology, Diagnostic Radiology, 1984

Dr.Stephenson's academic appointments include chief resident in radiology, instructor in clinical medicine at Dartmouth-Hitchcock Medical Center and clinical instructor in radiology at the University of California, San Francisco.

Education
M.D. - University of California, San Diego School of Medicine, La Jolla, CA 1980
B.S. - Stanford University, Stanford, CA 1976

Professional Training
Fellowship, Computed Tomography/Ultrasound
University of California, San Francisco-San Francisco General Hospital, San Francisco, CA 1984-1985

Residency, Diagnostic Radiology
Dartmouth-Hitchcock Medical Center, Hanover, NH 1981-1984

Internship, Internal Medicine
Dartmouth-Hitchcock Medical Center, Hanover, NH 1980-1981

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John S. Wilson, Jr., M.D.

American Board of Nuclear Medicine, 1976

Dr. Wilson received his residency training in skeletal radiology and orthopedic surgery at the University of California. He has enjoyed a notable career in radiology, including membership in professional organizations and many lectures and publications in a variety of areas of radiology.

Education
M.D. - University of California, San Francisco, CA 1973
B.S. - Northwestern University, Evanston, IL 1969

Professional Training
Residency, Skeletal Radiology
University of California, San Francisco (UCSF), CA, 1978-1979

Residency, Radiology
UCSF, San Francisco, CA, 1974-1978

Residency, Orthopedic Surgery
UCSF, San Francisco, CA, 1974-1975

Internship, Department of Surgery
UCSF, San Francisco, CA, 1973-1974

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