Our Radiologists

Alex Chien, M.D.

Dr. Chien recieved his Doctorate in Medicine in 1997 from the University of Michigan. He then completed his clinical internship at Michigan State University in 1998, and his residency in Diagnostic Radiology at the University of Michigan in 2002. Dr. Chien continued on as a lecturer at the University of Michigan, and completed a Fellowship in Musculoskeletal Radiology in 2003. Dr. Chien was Board Certified by the American Board of Radiology in 2002. Dr. Chien's professional expertise and interest are in musculoskeletal sonography, and bone and joint procedures. Alex resides in Chino Hills with his fiance, Corina, who is a medical student at Western University.

Harold D. Damuth, Jr., M.D.

Dr. Damuth received his undergraduate degree from Stanford University and his medical degree from the University of Cincinnati. He completed his Diagnostic Radiology Residency and Vascular Interventional Radiology Fellowship at the University of Southern Caifornia, Irvine. He joined the PVHMC Medical Staff in 1983 and served as Medical Staff President in 2000. Dr. Damuth's interests are in Interventional Radiology and Vascular Imaging. He lives with his wife, Barbara, in Claremont and has two grown children.

Johnson B Lightfoote, M.D., M.B.A.

Director of the Department of Radiology at Pomona Valley Hospital Medical Center, having previously served in that capacity at the University of Southern California's University Hospital. Johnson received his B.A. in engineering and M.D., from Harvard, and his M.B.A. from Pepperdine University, concentrating on capitation in radiology. After residencies at Stanford University and the University of California San Francisco and Irvine, his Fellowships include Computed Tomography and Interventional Radiology. He was certified by the American Board of Radiology in 1982, and holds the Certificate of Added Qualifications in Neuroradiology (1999). His clinical radiology interests include CT, MR, neuroradiology, body imaging and teleradiology. Johnson and his wife, Aquinas, have two children and live in West Covina.

Paul A. Reisch, M.D.

Dr. Reisch was born and raised in San Bernardino. He received his undergraduate degree from Notre Dame and medical degree from Creighton University. He completed his Diagnostic Radiology Residency and a two-year Neuroradiology Fellowship from USC. Dr. Reisch's special interests are in neuroradiology, body imaging and mammography. He has also developed a Percutaneous Vertebroplasty program at PVHMC for treatment of symptomatic compression fractures. Paul lives in Claremont with his wife, Charlotte, and three children.

Robert Ring, M.D.

Dr. Ring received his medical degree from the University of Texas Southwestern Medical School in 1966. His Internal Medicine internship was at Boston City Hospital and Radiology Residency at Massachusetts. A fellowship year at the University of Texas Medical Branch in Galveston, Texas preceded his employment with the Radiology Group at PVHMC starting in July 1973. Dr. Ring has held various positions at PVHMC including Medical Staff President in 1995, and Director of the Cancer Program 2002-2004. His current radiological interests are in cross sectional and oncology imaging, and he is enjoying part time employment with the Radiology Group. He resides in Claremont in winter and spring, and in Maine in the summer and fall with his wife, Diann.

Christina Tsao Benedict, MD

Dr. Benedict,has been a member of Pomona Valley Imaging Group since July, 2007. Dr. Benedict received her medical education at University of Michigan (2001), diagnostic radiology residency at Henry Ford Health System (2006), and neuroradiology fellowship at University of Southern California (2007). She is board certified in diagnostic radiology. Her clinical interests included all aspects of diagnostic radiology with a particular emphasis on CNS, head and neck, spine, bone and joints, and body imaging.

Yanle Zhao, M.D.

Dr. Zhao, has been on the medical staff at PVHMC since 2005 and has served as Vice Chairman of Department of Radiology at Pomona Valley Hospital Medical Center since 2008. Dr. Zhao received his medical degree from Henan Medical University. He completed his diagnostic radiology residency (2004) at LAC/USC Medical Center, and neuroradiology fellowship (2005), interventional radiology fellowship (2007) at University of Southern California. Dr. Zhao is a volunteer clinical assistant professor in Dept. of Radiology at USC. He is a member of Radiological Society of North America, American Roentgen Ray Society, Los Angeles Radiological Society, and Society of Interventional Radiology.

David R. Alvarez, M.D.

Dr. Alvarez, is one of the newest members of Pomona Valley Imaging Medical Group, having joined February 2008. Dr. Alvarez earned his undergraduate and medical degrees at UC Irvine. He completed a diagnostic radiology residency at Loma Linda University where he served as chief resident. He then returned to UC Irvine for a body imaging fellowship. He became certified by the American Board of Radiology in 2006. Dr. Alvarez is a part-time associate diplomate physician and volunteer assistant clinical professor at UC Irvine. He is a member of the Orange County Radiological Society, where he serves on the executive committee. He is also a member of the American College of Radiology, the Radiological Society of North America, and the American Roentgen Ray Society. Dr. Alvarez’s clinical interests include cross-sectional imaging and the exciting new technology of PET/CT.

Stephen Y. C. To, M.D.

Dr. Y. C. To, has been a member of the Pomona Valley Imaging Medical Group since May of 2006, and serves as its Chief of Interventional Radiology.   He completed his medical education (1991), radiology residency (1996), and interventional radiology fellowship (1997) at UCLA. The American Board of Radiology certified him in 1996 with a Certificate of Additional Qualification in Vascular and Interventional Radiology in 1998. His clinical interests included all aspects of diagnostic and interventional radiology. He is a member of the American College of Radiology, Radiological Society of North America, American Roentgen Ray Society, Los Angeles Radiological Society, and Society of Interventional Radiology.

Daniel R. Heitz, M.D.

Dr. Heitz, graduated in 1983 from UC Irvine with Bachelor degrees in Biology and Chemistry. He received his medical degree from USC Keck School of Medicine in 1989 and subsequently, performed his internship, diagnostic radiology residency, and abdominal imaging fellowship training at UCLA Medical Center with completion in 1995. His abdominal imaging fellowship also focused on additional interventional radiological training. Dr. Heitz then entered private practice at St. Francis Medical Center in Lynwood, CA, where he practiced general, hospital-based diagnostic radiology until 2007, at which time; he joined the group at Pomona Valley Hospital Medical Center in June. In this setting, Dr. Heitz continues general practice with an emphasis on interventional techniques as well as mammography. In addition to his hospital-based radiological responsibilities, he has been active in several radiological societies and served on several hospital committees including bioethics, radiation safety, case management, emergency medicine, and cancer care.
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