School of Medicine


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  • Peter Poullos

    Peter Poullos

    Clinical Associate Professor, Radiology

    BioDr. Poullos is a native of Stockton California. He earned his B.S. at Santa Clara University and M.D. degree at the University of Texas Medical School at Houston, after which he did an Internal Medicine residency at the University of California-San Francisco, finishing in 2002. He stayed at UCSF as a Gastroenterology fellow until 2004. However, after a spinal cord injury, he decided to retrain in Radiology. He did his Radiology residency at Stanford University, where he also completed a fellowship In Body Imaging in 2009. Dr. Poullos is now faculty in both the departments of Radiology and Gastroenterology and Hepatology. His clinical practice is at the Stanford Medicine, where he specializes in CT, MRI, and ultrasound of the abdomen and pelvis. His interests include radiology of the acute abdomen, hepatobiliary imaging, and colorectal cancer screening.

    Dr. Poullos is the Founder and Co-Chair of the Stanford Medicine Alliance for Disability Inclusion and Equity (SMADIE), a group composed of people with disabilities and their allies at Stanford Medicine. In that role, Dr. Poullos advocates for students and healthcare providers with disabilities and for health equity for disabled patients. He is a Faculty Advisor to the Stanford Medical Students with Disability and Chronic Illness (MSDCI) and the MSDCI National organizations. Dr. Poullos and SMADIE have made significant contributions to the disability community, including starting the Stanford Conference on Disability in Healthcare and Medicine, drawing over 1000 participants from 39 countries. He is the Co-Host of the popular “DocsWithDisabilities” podcast, has spoken internationally about disability access in medicine, and has written and researched in the field. One of his proudest achievements is co-creating the Disability in Medicine Mutual Mentorship Program, serving the needs of disabled medicine and healthcare students and practitioners. In 2022, Dr. Poullos received the Stanford President’s Award for Excellence through Diversity.

  • Shirin Pourashraf

    Shirin Pourashraf

    Postdoctoral Scholar, Molecular Imaging Program at Stanford

    Current Research and Scholarly InterestsMy working is focused on building a 100 ps CTR pre-clinical partial ring TOF-PET scanner; specifically, by exploring, and designing high speed low noise/jitter instrumentation, and data acquisition.
    I am also designing an scalable side-readout electronic to detect Cherenkov radiation and improve TOF resolution in PET detectors using BGO crystals.

  • Rosita Primavera

    Rosita Primavera

    Basic Life Research Scientist, Rad/Pediatric Radiology

    BioDr. Rosita Primavera is a Basic Life Research Scientist at Stanford University in the Department of Radiology/Pediatric Radiology. She has a MD in chemistry and pharmaceutical technology and a PhD degree in Cellular and Molecular Biotechnologies. Dr. Primavera has documented experience on the development of nano- and micro-drug delivery systems (DDS) as well as 3D-platforms for the treatment of different diseases. She has trained in developing DDS and 3D-platforms with different materials (synthetic or natural) and employing different techniques (e.g. top/down or bottom/up fabrication). In the last few years, her research interests are focused primarily on diabetes. She has been extensively trained on how to handle and process pancreatic islets from different origins (mouse, rat and human) and she has excellent knowledge and skills to manage and perform in vitro and in vivo experiments involving diabetic animals. She is currently working on the realization of on-commanded system mimicking pancreatic islet function; and both the role of 3D-bioscaffold in pancreatic islet transplantation and the role of the mesenchymal stem cell in the setting of diabetes using novel cellular approaches (i.e. co-transplantation with islets alone or within novel bioscaffolds).

  • Benjamin Pulli, MD

    Benjamin Pulli, MD

    Clinical Assistant Professor, Radiology
    Clinical Assistant Professor (By courtesy), Neurosurgery

    BioDr. Pulli is a dual fellowship trained diagnostic and interventional neuroradiologist with a focus on vascular disorders of the brain, head, neck, and spine. He is a clinical assistant professor in the Department of Radiology, Neuroradiology Division.

    Having grown up in Austria, Dr. Pulli moved to the US after completing medical school in Innsbruck, Austria. He completed post-doctoral research training in stroke imaging in the Division of Neuroradiology at the Massachusetts General Hospital, as well as in experimental molecular imaging techniques of neuroinflammatory disorders at the Center for Systems Biology of Massachusetts General Hospital and Harvard Medical School.

    He completed residency training in Radiology and fellowship training in Diagnostic Neuroradiology at the Massachusetts General Hospital in Boston. He then completed a second fellowship in interventional neuroradiology/neurointerventional surgery at Stanford University School of Medicine.

    After having graduated from fellowship, Dr. Pulli then spent more than a year practicing Interventional Neuroradiology at Pacific Neuroscience Institute in Los Angeles. He employs state-of-the-art minimally invasive endovascular and percutaneous surgical techniques to treat patients with brain aneurysms, arteriovenous malformations, dural arteriovenous fistulas, carotid artery stenosis, acute stroke, chronic subdural hematoma, idiopathic intracranial hypertension, vascular tumors, and chronic back pain.

    His research focuses on advanced imaging techniques for acute ischemic stroke and other neurovascular diseases. He has authored more than 40 peer-reviewed publications and received scientific grants from institutions such as the Radiological Society of North America and the Ernst Schering Foundation. In addition, he has made invited presentations to his peers at meetings of organizations such as the American Society of Neuroradiology, Radiological Society of North American, European Congress of Radiology, and Western Neuroradiological Society.

    He is a member of the Society of Neurointerventional Surgery.