Robert Francois Hobbs, Ph.D.

  • Associate Professor of Radiation Oncology and Molecular Radiation Sciences

Research Interests

radiopharmaceutical dosimetry and treatment planning; alpha-particle therapy and dosimetry; combination therapies with radiation more


Dr. Robert Hobbs is an Assistant Professor in the Johns Hopkins Medicine Department of Radiology and Radiological Science and a member of the Johns Hopkins Kimmel Cancer Center. His research focuses on clinical and alpha dosimetry, modeling, and external beam radiation.

Dr. Hobbs is a member of the Radionuclide Therapy and Dosimetry (RTD) Research Lab, where he performs tail vein injections and bio-distribution, and provides assistance to Dr. Hong Song. He is engaged in research that examines how tumor burden and prior chemotherapy affects bone marrow dosimetry.

Dr. Hobbs earned his Ph.D. in experimental high-energy physics from the University of New Mexico. Dr. Hobbs joined the Johns Hopkins faculty in 2006. more


  • Associate Professor of Radiation Oncology and Molecular Radiation Sciences
  • Associate Professor of Oncology
  • Associate Professor of Radiology and Radiological Science

Departments / Divisions



  • Ph.D.; University of New Mexico (New Mexico) (2006)

Research & Publications

Research Summary

Dr. Hobbs' research focuses on dosimetry, which measures and calculates the radiation dose received by matter and tissue that has been exposed to radiation.

His current studies examine various radiobiologic modeling techniques for treatment of specific tumors and cancers. Dr. Hobbs is also developing an alpha-particle dosimetry model that can examines alpha particles which are hard to study with current imaging modalities.

As part of his medical physics residency, Dr. Hobbs is studying the use and effectiveness of external beam radiation.

Selected Publications

RF Hobbs, H Song, CJ Watchmann, WE Bolch, AK Aksnes, T Ramdahl, GD Flux, George Sgouros.“A bone marrow toxicity model for ²²³Ra alpha-emitter radiopharmaceutical therapy”.Phys Med Biol 2012, 57(10):3207-22.

RF Hobbs, H Song, DL Huso, MHSundel, G Sgouros.“A nephron-based model of the kidneys for macro-to-microa-particle dosimetry”.Phys Med Biol 2012, 57(13):4403-24.

RF Hobbs, T McNutt, S Baechler, B He, CE Esaias, EC Frey, DM Loeb, RL Wahl, O Shokek, G Sgouros.“A treatment planning methodology for sequentially combining radiopharmaceutical therapy and external radiation therapy.”Int J Radiat Oncol Biol Phys 2011,80(4):1256-62.

RF Hobbs, S Baechler, S Senthamizhchelvan, AR Prideaux, CE Esaias, M Reinhardt, EC Frey, DM Loeb, G Sgouros. “A gamma camera count rate saturation correction method for whole body planar imaging”. Phys Med Biol 2010, 55(3):817-831.

RF Hobbs, S Baechler, DX Fu, CE Esaias, MG Pomper, RF Ambinder, G Sgouros. “A model of cellular dosimetry for macroscopic tumors in radiopharmaceutical therapy”. Med Phys 2011, 38(6):2892-2903.

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