Ramsey Badawi, Ph.D.

Ramsey Derek Badawi, Ph.D.



Alzheimer's Disease



Biomedical Engineering

Radiology - Cardiovascular Imaging (MR, CT, SPECT, PET)




  • Co-Director, EXPLORER Molecular Imaging Center
  • Co-Director, Comprehensive Cancer Center Biomedical Technology Program
  • Chief, Division of Nuclear Medicine
  • Vice-Chair for Research, Department of Radiology
  • Professor, Division of Biomedical Engineering
  • Professor


To see if Ramsey Derek Badawi is accepting new patients, or for assistance finding a UC Davis doctor, please call 800-2-UCDAVIS (800-282-3284).

Lawrence J. Ellison Ambulatory Care Center

4860 Y St., Suite 3100
Sacramento, CA 95817
Driving Directions

Primary Phone:

Additional Phone Numbers

Phone: 916-734-3651
Fax: 916-703-2278
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
Radiology Physics

Center/Program Affiliation

UC Davis Comprehensive Cancer Center


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

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

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

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


Radiology/PET physics, University of Washington Medical Center, Seattle WA 1998-2000

Professional Memberships

American Association of Physicists in Medicine

Institute for Electrical and Electronic Engineers, Senior Member

Society for Nuclear Medicine and Molecular Imaging

Select Recent Publications

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, Badawi RD. Technical Note: Performance Assessment of a Software-Based Coincidence Processor for EXPLORER. Phys Med Biol. 2018 Sep;63(2018) 18NT01 (7pp).

Wang G, Corwin MT, Olson KA, Badawi RD, Sarkar S. Dynamic 18F-FDG PET of Human Liver Inflammation: Impact of Kinetic Modeling with Optimization-Derived Dual-Blood Input Function. Phys Med Biol. 2018 Jul;63(15):155004 (14pp).

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.

Cherry SR, Jones T, Karp JS, Qi J, Moses WW, Badawi RD. Total-Body PET: Maximizing Sensitivity to Create New Opportunities for Clinical Research and Patient Care. J Nucl Med. 2018 Jan;59(1):3-12. doi:10.2967/jnumed.116.184028. Epub 2017 Sep 21. PMID:28935835.