Radiology Staff Members - VA Palo Alto Health Care System
Attention A T users. To access the menus on this page please perform the following steps. 1. Please switch auto forms mode to off. 2. Hit enter to expand a main menu option (Health, Benefits, etc). 3. To enter and activate the submenu links, hit the down arrow. You will now be able to tab or arrow up or down through the submenu options to access/activate the submenu links.

VA Palo Alto Health Care System


Radiology Staff Members

Payam Massaband Payam Massaband, MD, is the Chief of Radiology at VAPAHCS. He completed his radiology residency, as well as cardiovascular and musculoskeletal fellowship training, at Stanford University School of Medicine. As Radiology Service Chief and Stanford Radiology Residency Program Director, his areas of emphasis are clinical excellence, quality assurance, process improvement, and residency education.
Michelle Nguyen Michelle Nguyen, MD, graduated from Stanford University School of Medicine with a distinction for research. She completed her diagnostic radiology residency at UC San Diego, where she was Chief Resident, and stayed at UCSD for her fellowship in musculoskeletal imaging. Her expertise is in imaging of arthritis and sports injuries, and she is also involved in the Stanford radiology residency and resident education.
Katherine To’o Katherine To’o, MD, received her MD from the University of California, Los Angeles, and completed her internal medicine internship at Kaiser Permanente Santa Clara. After diagnostic radiology residency at University of California San Francisco, she completed her body imaging fellowship at Stanford University. After fellowship, she joined the Radiology Department at Keck School of Medicine at the University of Southern California as part of the body imaging faculty. In 2013, she joined the Abdominal Imaging Section at VAPAHCS and is Clinical Assistant Professor (Affiliated) of Radiology at Stanford University School of Medicine. Her clinical interests include uroradiology, oncologic imaging, and residency education.
Rajesh Shah Rajesh Shah, MD, is a staff physician in vascular and interventional radiology at VAPAHCS. Dr. Shah received his MD from The University of Chicago Pritzker School of Medicine, followed by radiology residency at the University of Illinois Chicago, and fellowship training in interventional radiology at Stanford University. After fellowship, Dr. Shah worked as an interventional radiologist at Memorial Sloan Kettering Cancer Center in New York City, and returned to Stanford in 2011 to join the Interventional Radiology Division, with particular emphasis in building the interventional radiology service at VAPAHCS and performing clinical and research work at Stanford. In 2017, Dr. Shah moved to VAPAHCS full-time as Director of Interventional Radiology and Associate Chief of Radiology. Dr. Shah has an extensive background in interventional oncology, performing a wide range of procedures, including lung, liver, kidney, and bone ablations; chemoembolization, embolization, and radioembolization of tumors; biopsies; drainages; and venous and arterial interventions. He was the first physician to perform SIR-Spheres radioembolization for metastatic tumors to the liver within the VA hospital system. Dr. Shah is currently performing research in clinical trials and application of big data to medicine, and has an avid interest in trainee teaching and clinical excellence.
Christine Ghatan Christine Ghatan, MD, is a staff physician in vascular and interventional radiology at VAPAHCS and clinical instructor (Affiliated) at Stanford University School of Medicine. She is board-certified by the American Board of Radiology. She earned her MD from the Keck School of Medicine at the University of Southern California, and completed general surgery internship and diagnostic radiology residency at Cedars-Sinai Medical Center in Los Angeles. After fellowship in interventional radiology at Mount Sinai Medical Center in New York, she joined the University of Colorado School of Medicine as Assistant Professor of Radiology until joining the VA in 2017. She specializes in state-of-the-art microinvasive image-guided therapies, focusing on the treatment of primary and metastatic liver cancer through targeted local delivery of advanced therapies (radioembolization, chemoembolization and ablation), with additional interest in expanding indications for embolotherapy. Additional interests include IR physician education, innovations in imaging and related devices, radiation-dose reduction technologies, and IR advocacy and multidisciplinary outreach.
Eric Olcott Eric Olcott, MD, trained at the University of California San Francisco and Stanford University, and completed fellowships in abdominal imaging and interventional radiology. His current interests include applications of CT, MRI and ultrasound to the diagnosis of abdominal diseases, particularly appendicitis, hepatobiliary neoplasms, pancreatic tumors, gallbladder abnormalities, colonic and small bowel lesions; and the urinary system. He immensely enjoys teaching and the opportunity to interact with colleagues of all specialties.
Stephanie Chang Stephanie Chang, MD, completed her radiology residency and fellowship in body MRI at Stanford University. She is interested in body MRI, particularly pancreatic, genitourinary, and women’s imaging, and her research interests include radiogenomics correlating imaging features with specific mutations of solid tumors in the abdomen and pelvis, and MR imaging of pancreatic cancer.
Thomas Osborne Thomas Osborne, MD, is the Chief Medical Informatics Officer at VAPAHCS. He graduated from Dartmouth Medical School, and completed his diagnostic radiology residency at Mount Auburn Hospital in Cambridge, MA, and neuroradiology fellowship at Massachusetts General Hospital in Boston. He is board-certified in radiology and has his CAQ in neuroradiology, both from the American Board of Radiology. His current focus is on building collaborations within the VAPAHCS network to positively transform healthcare, and his interests include applications of artificial intelligence in medicine to advance health care.
Eric Tranvinh Eric Tranvinh, MD, received his MD from the University of Texas Southwestern Medical Center in Dallas, and completed his internal medicine internship at Baylor College of Medicine in Houston. After diagnostic radiology residency at the University of Texas Health Science Center in San Antonio, he completed his neuroradiology fellowship at Stanford University School of Medicine. He is currently Clinical Assistant Professor of Radiology in neuroimaging and neurointervention. Dr. Tranvinh provides clinical neuroradiology services at VAPAHCS and his clinical interests include spine, head and neck, and neurovascular imaging.
Diamanto (Amanda) Rigas Diamanto (Amanda) Rigas, MD, graduated from Harvard University in 2005. After two years of clinical research in the fields of pediatrics and oncology, she attended Case Western Reserve University, where she received her MD in 2011. She completed her internal medicine internship at Case Medical Center in 2012, followed by a diagnostic radiology residency at Beth Israel Deaconess Medical Center in Boston in 2016. She completed her interventional radiology fellowship at the Medical College of Wisconsin in 2017. Dr. Rigas is proud to join VAPAHCS as an attending radiologist in the Interventional Radiology Division. Her clinical and teaching interests include management of peripheral arterial disease and aortic pathologies. She is a Clinical Instructor (Affiliated) of Radiology at Stanford University School of Medicine.
  Lewis Shin, MD, is the Division Chief of Abdominal Imaging at VAPAHCS, and is Clinical Associate Professor (Affiliated) of Radiology at Stanford University School of Medicine. He completed the National Cancer Institute Advanced Cancer Imaging Fellowship at Stanford in abdominal imaging. Dr. Shin is a graduate of the Program of Liberal Medical Education at Brown University/Brown University Medical School, where he received his B.S. in Neuroscience and MD degrees, respectively. His clinical and research experience include abdominal oncologic imaging (liver, prostate, kidney, pancreas, lymphoma); MR/CT enterography (i.e. Crohns disease); and real-time MRI in patients with obstructive sleep apnea.
Bao Do Bao Do, M.D. completed his diagnostic radiology residency and musculoskeletal imaging fellowship at Stanford University School of Medicine. During training, he worked with experts in the field to diagnose and treat sports injuries, including in collegiate and Bay Area professional athletes. Dr. Do is fortunate to work in a field that combines medicine with computers to diagnose disease non-invasively, and feels privileged to serve our Veterans at Palo Alto as a staff physician in the Radiology Service.
Sachin Malik Sachin Malik, MD, is a staff physician in cardiothoracic/cardiovascular imaging at VAPAHCS. Dr. Malik completed his residency training in diagnostic radiology at Kaiser Permanente Los Angeles Medical Center. He completed his fellowship training in cardiothoracic imaging at Duke University in 2016, after which he came on board at the VA in the thoracic and cardiovascular imaging section. He currently serves as Division Chief for Thoracic and Cardiovascular Imaging. His clinical interests include MRI physics, cardiac MRI, adenosine stress cardiac MRI, cardiac CTA, vascular MRA, and vascular CTA.
Charles T. Lau Charles T. Lau, MD, MBA, is a board-certified radiologist, fully trained in cardiothoracic radiology and interventional radiology. His clinical interests include interstitial lung disease, lung transplantation, lung cancer screening, and education. Dr. Lau completed his internal medicine internship at Brigham and Women’s Hospital in Boston and diagnostic radiology residency at the University of Pennsylvania, where he served as Chief Resident. His clinical training continued with dual fellowships in interventional radiology and cardiothoracic imaging at the University of Pennsylvania. Dr. Lau joined the Cleveland Clinic in 2009, and was appointed Section Chief of Thoracic Imaging in 2012 where he spearheaded and nurtured the simultaneous expansion of the section’s clinical, research, and educational programs and its growth into an 11-member service, and also served on the editorial board of the Cleveland Clinic Outcomes Books. Dr. Lau is a recognized leader in advancing health care delivery through collaborative analytics/modeling, innovative educational models, and creatively designed clinical tools. He is a well-known clinical mobile software developer whose apps are used by thousands of clinicians around the world every day. Among his many honors, Dr. Lau has received the Arnold Dunne Award for Outstanding Patient Care from Brigham and Women’s Hospital, the Baum-Laufer Award for Excellence in the Service to the Penn Radiology Residency, several Stanford Radiology Annual Teaching Awards, and the Norman Glazer Distinguished Teaching Award from Cleveland Clinic.

Back to Radiology Home