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Photo of Dr. Rathan Subramaniam

Rathan Markandan Subramaniam, M.B.B.S., M.D., Ph.D.

Associate Professor of Radiology and Radiological Science

Male  | Languages: English, Tamil

Appointment Phone


Main Location

The Johns Hopkins Hospital

Out-of-State & International Patients +
Out of State Patients

Call 410-464-6641 (8a.m. to 6p.m., EST, Mon-Fri)

Learn more about our out-of-state patient services »

International Patients

Call +1-410-502-7683 (7a.m. to 6p.m., EST, Mon-Fri)

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  • Associate Professor of Radiology and Radiological Science
  • Associate Professor of Oncology
  • Associate Professor of Otolaryngology - Head and Neck Surgery

Centers & Institutes



The Johns Hopkins Hospital

600 N. Wolfe Street
Sheikh Zayed Tower
Baltimore, MD 21287 map
Phone: 410-955-6500

Johns Hopkins Medicine - Green Spring Station

Green Spring Station
10755 Falls Road
Pavilion I
Lutherville, MD 21093 map


Diagnostic Radiology

Research Interests

Health policy and management; Otolaryngology; Cancer; Computed tomography (CT); Positron emission tomography (PET); Quantitative molecular imaging; Neuroimaging; Diagnostic radiology


Dr. Rathan M. Subramaniam is an Associate Professor in the Johns Hopkins Medicine Division of Nuclear Medicine within the Department of Radiology and Radiological Science.

He also has appointments in the Department of Otolaryngology-Head and Neck Surgery and the Department of Oncology.

An internationally recognized expert in quantitative molecular imaging with positron emission tomography (PET) and computed tomography (CT), Dr. Subramaniam specializes in diagnostic radiology.

His clinical and research interests include molecular imaging in cancer, neuroimaging, and health policy and management.

Dr. Subramaniam earned his medical degree from Australia’s University of Melbourne Faculty of Medicine. He completed an internship at Melbourne’s Western Hospital, a radiology residency at New Zealand’s Waikato Hospital, and fellowships in nuclear radiology and neuroradiology at the Mayo Clinic.

A 2003 Fulbright Scholar, he also holds a Masters in Clinical Education from Australia’s University of New South Wales Teaching Hospital and a Ph.D. from the University of Auckland in New Zealand. In addition, he earned a Masters of Public Health from Harvard University and an executive certificate in leadership and management from the MIT Sloan school of Management.

Dr. Subramaniam was President of the Association of University Radiologists in 2013 and continues to serve in many capacities. He has delivered nearly 100 invited CME lectures and been awarded more than 20 research grants worldwide.

He has published nearly 80 peer-reviewed articles, co-edited Novel Imaging Techniques in Neurodegenerative and Movement Disorders, An Issue of PET Clinics, 1e (The Clinics: Radiology) and authored PET/CT and PET/MRI in Oncology: A Practical Guide.

A Fellow of the Royal Australian and New Zealand College of Radiologists, Dr. Subramaniam is American Board of Radiology-certified in neuroradiology and diagnostic radiology. more

    Additional Information

  • Education +


    • University of Melbourne Faculty of Medicine / MBBS (1997)


    • WAIKATO HOSPITAL / Radiology (2005)


    • Canberra Hospital / Radiology (2005)
    • Mayo Medical School College of Medicine (2007)
    • Mayo Medical School College of Medicine / Neuroradiology (2008)


    • American Board of Nuclear Medicine / Nuclear Medicine (2013)
    • American Board of Radiology / Diagnostic Radiology (2010)
    • American Board of Radiology / Neuroradiology (2012, 2016)
  • Research & Publications +

    Research Summary

    Dr. Subramaniam’s research focuses on value of quantitative imaging using PET/CT, SPECT/CT and MRI for human translational oncologic imaging, imaging therapy assessment of oncologic patients and link imaging biomarkers to patient quality of life and survival outcomes. His work further synthesizes systemic evidence development for imaging and patient experience and outcomes and shapes health policy and practice. The work is supported with NIH, AHRQ, industry and foundation and training grants.

    Undergraduates, medical students, post doctoral research fellows, clinical residents, fellows and junior faculty from multiple medical specialities are supported and mentored in their career advancement.

    If you are interested to contribute and collaborate, please contact Dr. Subramaniam,

    Selected Publications View all on PubMed

    1. Whitworth PW, Agarwal A, Colucci A, Sherry SJ, Subramaniam RM. "Radiology research and medical students." Acad Radiol. 2013 Dec;20(12):1506-10. doi: 10.1016/j.acra.2013.09.013.
    2. Paidpally V, Tahari AK, Lam S, Alluri K, Marur S, Koch W, Wahl RL, Subramaniam RM. "Addition of 18F-FDG PET/CT to Clinical Assessment Predicts Overall Survival in HNSCC: A Retrospective Analysis with Follow-up for 12 Years." J Nucl Med. 2013 Dec;54(12):2039-45. doi: 10.2967/jnumed.113.121285. Epub 2013 Oct 7.
    3. Tahari AK, Alluri KC, Quon H, Koch W, Wahl RL, Subramaniam RM. "FDG PET/CT Imaging of Oropharyngeal Squamous Cell Carcinoma: Characteristics of Human Papillomavirus-Positive and -Negative Tumors." Clin Nucl Med. 2013 Oct 22. [Epub ahead of print]
    4. Subramaniam RM, Agarwal A, Colucci A, Ferraro R, Paidpally V, Mercier G. "Impact of concurrent diagnostic level CT with PET/CT on the utilization of stand-alone CT and MRI in the management of head and neck cancer patients." Clin Nucl Med. 2013 Oct;38(10):790-4. doi: 10.1097/RLU.0b013e31829f8ca5.
    5. Ahlawat S, Blakeley J, Montgomery E, Subramaniam RM, Belzberg A, Fayad LM. "Schwannoma in neurofibromatosis type 1: a pitfall for detecting malignancy by metabolic imaging." Skeletal Radiol. 2013 Sep;42(9):1317-22. doi: 10.1007/s00256-013-1626-3. Epub 2013 May 7.
  • Academic Affiliations & Courses +
  • Activities & Honors +


    • Fulbright Travel Award, 2003
    • Fellow, Royal Australian and New Zealand College of Radiologists, 2005
    • Mayo Brothers’ Distinguished Fellowship award, Mayo Clinic, 2007
    • Thomas Baker Fellow, Royal Australian and New Zealand College of Radiologists, 2007
    • Vice Chancellor’s Prize for best doctoral thesis, University of Auckland, 2008
    • Magna Cum Laude award, RSNA, 2009
    • Fellow, GERRAF , 2010
    • New Investigator award, Radiology Research Alliance, 2010
    • GE-RSNA Education scholar, 2013
    • Fellow, American College of Nuclear Medicine, 2014


    • Board of Nuclear Oncology Council, Society of Nuclear Medicine Royal Society of New Zealand
    • Fulbright Academy
      Life Member

    Professional Activities

    • Board of Directors, AUR 2014, 2014
    • Board of Directors, SNMMI, 2014
      PET center of excellence
    • Board of Directors, SNMMI, 2014
      Academic Council
    • Chair, American College of Radiology, 2013 - 2014
      Molecular Imaging Committee
    • President, Radiology Research Alliance 2012, 2012
    • President Elect, American College of Nuclear Medicine, 2013
    • Treasurer, SNMMI, 2014
      Nuclear Oncology Council
    • Vice Chair, Nuclear Medicine and Molecular Imaging, 2012
      ACR commission
  • Videos & Media +
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