Ramsey D. Badawi, Ph.D. for UC Davis Health

Ramsey D. Badawi, Ph.D.

Co-Director, EXPLORER Molecular Imaging Center

Co-Director, UC Davis Comprehensive Cancer Center Biomedical Technology Program

Vice-Chair for Research, Department of Radiology

Professor, Division of Biomedical Engineering

Professor, Department of Radiology



Nuclear Medicine

Diagnostic Radiology



Locations and Contact

Additional Numbers

Physician Referrals

800-4-UCDAVIS (800-482-3284)

Clinical Interests

Dr. Badawi is a medical physicist who specializes in nuclear medicine imaging. His clinical interests include ensuring excellent quality control and performance of diagnostic imaging equipment in the Division of Nuclear Medicine. He also works to ensure the quality of dosimetry for radionuclide therapies. He is responsible for advising UC Davis Health with regard to imaging equipment purchases and installation, and helps develop imaging and therapy procedures to ensure that the very best care is delivered to the patient.

Research/Academic Interests

Dr. Badawi's research interests are focused on the development and application of new types of nuclear medicine and molecular imaging scanners. Dr. Badawi is the co-inventor of Total-Body PET, along with Dr. Simon Cherry, and the two scientists co-direct the EXPLORER Molecular Imaging Center, which conducts cutting edge research in Molecular Imaging as well as providing the latest PET technology imaging services to patients.


Nuclear Medicine
Medical Physics

Center/Program Affiliation

UC Davis Comprehensive Cancer Center

Undergraduate School

B.Sc., University of Sussex, Brighton, United Kingdom 1987

Other School

Ph.D., Astronomy, University of London, London, United Kingdom 1998

Other School

M.Sc., Astronomy, University of Sussex, Sussex, United Kingdom 1988


Zhang X, Xie Z, Berg E, Judenhofer MS, Liu W, Xu T, Ding Y, Lv Y, Dong Y, Deng Z, Tang S, Shi H, Hu P, Chen S, Bao J, Li H, Zhou J, Wang G, Cherry SR, Badawi RD, Qi J. Total-Body Dynamic Reconstruction and Parametric Imaging on the uEXPLORER. J Nucl Med. 2020 Feb;61(2):285-291. doi:10.2967/jnumed.119.230565. Epub 2019 Jul 13. PMID:31302637.

Sarkar S, Corwin MT, Olson KA, Stewart SL, Liu CH, Badawi RD, Wang G. Pilot Study to Diagnose Nonalcoholic Steatohepatitis With Dynamic 18F-FDG PET. AJR Am J Roentgenol. 2019 Mar;212(3):529-537. doi:10.2214/AJR.18.20012. Epub 2019 Jan 23. PMID:30673340.

Lv Y, Lv X, Liu W, Judenhofer MS, Zwingenberger A, Wisner E, Berg E, McKenney S, Leung E, Spencer BA, Cherry SR, Badawi RD. Mini EXPLORER II: a prototype high-sensitivity PET/CT scanner for companion animal whole body and human brain scanning. Phys Med Biol. 2019 Mar 21;64(7):075004. doi:10.1088/1361-6560/aafc6c. PMID:30620929.

Badawi RD, Shi H, Hu P, Chen S, Xu T, Price PM, Ding Y, Spencer BA, Nardo L, Liu W, Bao J, Jones T, Li H, Cherry SR. First Human Imaging Studies with the EXPLORER Total-Body PET Scanner. J Nucl Med. 2019 Mar;60(3):299-303. doi:10.2967/jnumed.119.226498. Epub 2019 Feb 7. PMID:30733314.

Leung EK, Judenhofer MS, Cherry SR, Badawi RD. Performance assessment of a software-based coincidence processor for the EXPLORER total-body PET scanner. Phys Med Biol. 2018 Sep 19;63(18):18NT01. doi:10.1088/1361-6560/aadd3c. PMID:30152793.

Wang G, Corwin MT, Olson KA, Badawi RD, Sarkar S. Dynamic PET of human liver inflammation: impact of kinetic modeling with optimization-derived dual-blood input function. Phys Med Biol. 2018 Jul 24;63(15):155004. doi:10.1088/1361-6560/aac8cb. PMID:29847315.

Zhang X, Badawi RD, Cherry SR, Qi J. Theoretical study of the benefit of long axial field-of-view PET on region of interest quantification. Phys Med Biol. 2018 Jun 27;63(13):135010. doi:10.1088/1361-6560/aac815. PMID:29799814.

Berg E, Zhang X, Bec J, Judenhofer MS, Patel B, Peng Q, Kapusta M, Schmand M, Casey ME, Tarantal AF, Qi J, Badawi RD, Cherry SR. Development and Evaluation of mini-EXPLORER: A Long Axial Field-of-View PET Scanner for Nonhuman Primate Imaging. J Nucl Med. 2018 Jun;59(6):993-998. doi:10.2967/jnumed.117.200519. Epub 2018 Feb 1. PMID:29419483.

Godinez F, Gong K, Zhou J, Judenhofer MS, Chaudhari AJ, Badawi RD. Development of an Ultra High Resolution PET Scanner for Imaging Rodent Paws: PawPET. IEEE Trans Radiat Plasma Med Sci. 2018 Jan;2(1):7-16. doi:10.1109/TRPMS.2017.2765486. Epub 2017 Oct 23. PMID:31930184.

EXPLORER - The World's First Total-Body PET Scanner