Isis W Gayed, MD
Professor of Nuclear/Molecular Imaging

University of Texas Medical School at Houston
Houston, Texas, USA


Degree Institution and Location Year
MBBS Faculty of Medicine, The University of  Khartoum, Khartoum, Sudan 1986
  Michener Institute for Applied Health Sciences Center,             Toronto, Canada 1990
Postgraduate Training Observer, Emergency Department, Toronto General Hospital Ontario, Canada 1988- 1989
  Internship, Internal Medicine, Hahnemann University Hospital Philadelphia, PA. 1994- 1995
  Residency, Nuclear Medicine, Baylor College of Medicine Houston, Texas 1995-1997
  Fellowship, Nuclear Medicine, Baylor College of Medicine Houston, Texas 1997- 1998


Medical School: Faculty of Medicine, The University of Khartoum, Khartoum, Sudan, 1986; Internship: Internal Medicine, Hahnemann University Hospital, Philadelphia, PA., 1995; Residency: Nuclear Medicine, Baylor College of Medicine, Houston, Texas, 1997; Fellowship: Nuclear Medicine, Baylor College of Medicine, Houston, Texas, 1998.

Research Interest

  • Nuclear Radiology
  • Nuclear Medicine

Scientific Activities

1998 – 2001 Assistant Professor of Radiology, Department of Diagnostic and Interventional Imaging, Division of Nuclear Medicine The University of Texas Medical School – Houston Houston, Texas
2001 – 2008 Assistant Professor, Director of Cardiovascular Nuclear Medicine Department of Nuclear Medicine UT-M.D. Anderson Cancer Center Houston, Texas
2008- Present Associate Professor of Radiology, Chief of Nuclear Medicine Section Department of Diagnostic and Interventional Radiology The University of Texas Medical School– Houston Houston, Texas
1998-2001 Staff Radiologist, Nuclear Medicine Memorial Hermann Hospital Houston, Texas
2001-2008 Director, Cardiovascular Nuclear Medicine Department of Nuclear Medicine UT – MD Anderson Cancer Center Houston, Texas
12/2008 Staff Radiologist,– Present Chief, Nuclear Medicine Memorial Hermann Hospital Houston, Texas
12/2008- Present Staff Radiologist, Chief, Nuclear Medicine Lyndon B. Johnson Hospital Houston, Texas
Honors and Awards
1979 Award of Excellence in all Egyptian Schools in Sudan and Somalia, Final Top Score in High School Exams
1990 Honor Graduate of Michener Institute for Applied health Sciences, Nuclear Medicine Technology Program, Toronto, Canada
1991 Mallinckrodt Award, Highest mark in Nuclear Medicine Technology Exam
2012 Vanguard Urologic Research Foundation Award
2013 Houstonia Top Doctors listing, Selected by peer clinicians in Houston as one of two top doctors for Nuclear Medicine specialty


  1. Frumovitz M., Coleman R., Gayed I, Ramirez P, Wolf J, Levenback C. Utility of Preoperative Lymphoscintigraphy in Patients Undergoing Radical Hysterectomy and Pelvic Lymphadenectomy for Cervical Cancer. GynecolOncol 2004; 96:990.
  2. Helen H Liu, Blackmond S, Gayed I, Wang S, Wei X, Tucker S, Liao Z, Hofstetter W, Swisher S, Komaki R. Cardiac Toxicity from Chemoradiation with and without Surgery for Patients with Esophageal Cancer. Int J RadiatOncolBiol Phys 66(3):S285-S286, 2006.
  3. Fearmonti RM, Gayed IW, Kim E, Waraneke C, Bedrosian I, Hunt KK, Ghonimi E, Meric-Bernstam F, Babiera GV.  In vivo comparison of lymphatic drtrainage patterns of subareolar and peritumoral isotope injection for breast cancer.  Ann SurgOnc 2007; 14(2):P58.
  4. Won K, Gayed I, Namwongprom, E Kim, E Edmund Kim. Practical Criteria of Lung Scan Interpretation for Pulmonary Embolism in Patients with Cancer. J Nucl Med 48 (Suppl) 2:290p, 05/2007.
  5. WD Erwin, RE Wendt, S Kappadath, IW Gayed. Principal Component Analysis (PCA)-Based Radionuclide Separation in Simultaneous dual-isotope Tl-201/I-123 Cardiac Imaging. J Nucl Med 48 (Suppl) 2:419p, 05/2007.
  6. S Gohar, Z. Liao, S. W. Yusuf, H. H. Liu, I Gayed.  Myocardial Perfusion Abnormalities and the subsequent Clinical Implications in Patients with Esophageal and Lung Cancer after Chemoradiation therapy. J Nucl Med 49 (Suppl) 2:199p, 05/2008.
  7. Kothari,KD, Joseph,UA,Skolkin, D, David Q Wan, Isis W. Gayed. The Significance of Isolated Posterior Fossa Tc 99m ECD Uptake Seen on Cerebral Blood Flow Scintigraphy and its Relation to Patients’ Outcomes. The American Roentgen Ray Society’s 111th Annual Meeting, May 2, 2011. Chicago.
  8. Joseph, UA,Kanatsiz, O, Wan, DQ,Gayed, IW. Same day or next day breast lymphoscintigraphy injection, which works better? The Society of Nuclear Medicine Annual Meeting, J Nucl Med 52 (Suppl) 1: 405p, 06/2011.
  9. Wan, DQ, Slawin, K, Joseph, UA, Tammisetti, V, Santoshi, P, Gayed, I. Initial experience of prostate specific membrane antigen binding agent I-123-MIP-1072 nuclear scan in patients with metastatic prostate cancer: Comparison with bone and CT scans. J Nucl Med 52 (Suppl) 1: 83p, 06/2011.
  10. Joseph UA, Karni R., Wan DQ, Gayed IW. PET/CT Imaging of Abdomen and Pelvis in Head and Neck Cancers- Indicated or NOT? WMIC, 9/2016
  11. Gayed, I,Dhekne, R. A false negative Tc-99m hepatobiliary scan in a patient with Osler-Weber-Rendu diseaseClinNucl Med, 22(10): 712-713, 1997.
  12. Gayed IW, Elshazly SM. Intrathoracic splenosis: Status after a motor vehicle accident. ClinNucl Med. 25 (12): 1045-6, December 2000.
  13. Gayed I, Wendt, J, Haynie T, Dhekne R, Moore, W. Timing for repeated treatment of hyperthyroidism with radioactive iodine after initial treatment failure. ClinNucl Med 26 (1): 1-5, January 2001.
  14. Gayed, I,Elshazly, S, et al. Intrathoracic splenosis status post motor vehicle accident. ClinNucl Med, February 2001.
  15. Gayed, I.,Elshazly, SM, Vang, RS, Barron, BJ, Lamki, LM. Technetium-99m sestamibi uptake in a maxillary brown tumor. ClinNucl Med, 26 (1): 65-7, January 2001.
  16. Gayed, I,Boccalandro, F, Fang, B, Podoloff, D. New method for calculating right ventricular ejection fraction using gated myocardial perfusion studies. ClinNucl Med, 27 (5): 334-8, May 2002.
  17. Gayed, I, Cid, E, Boccalandro, F, Podoloff, D. Factors affecting left ventricular ejection fraction using automated quantitative gated SPECT. ClinNucl Med, 28 (4): 290-5 April 2003.
  18. Gayed, I, Vu, T, Johnson, M, Macapinlac, H, Podoloff, D. Comparison of bone and 2 - deoxy - 2-[18F] fluoro-D-glucosepositron emission tomography in the evaluation of bony metastases in lung cancer . MolImag and Biol, 5 (1):26-31, January 2003.
  19. Gayed, I, Vu, T, Iyler, R, Johnson, M, Macapinlacm H, Swanston, N, Podoloff, D. The role of F-18 FDG PET in staging and early prediction of response to therapy of recurrent gastrointestinal stromal tumors. J Nucl Med, 45 (1): 17-21, January 2004.
  20. Gayed, I, Kim, EE, Broussard, WF, Evans, D, Lee, J, Broemeling, LD, Ochoa, BB, Moxley, DM, Erwin, WD, Podoloff, DA. The value of Tc-99m sestamibi SPECT/CT over conventionalSPECT in the evaluation of parathyroid adenomas or hyperplasia. J Nucl Med, 46 (2): 248-52, February 2005.
  21. Frumovitz M, Coleman RL, Gayed IW, Ramirez, PT, Wolf, JK, Gershenson, DM, Levenback, CF. Usefullness of preoperative lymphoscintigraphy in patients undergoing radical hysterectomy and pelvic lymphadenectomy for cervical cancer. Am J ObstetGynecol, 194(4):1186-93, April 2006.
  22. Kawase K, Gayed I, Hunt KK, Kuerer, HM, Akins, J, Yi,M, Grimes, L, Babiera, GV, Ross, MI, Feig, BW, Ames, FC, Singletary, SE, Buchholz, TA, Symmans, WF, Meric-Bernstam, F. Use of lymphoscintigraphy defines lymphatic drainage patterns before sentinel lymph node biopsy for breast cancer. J Am CollSurg, 203(1):64-72, July, 2006.
  23. Gayed I, Liu H, Yusuf WS, Komaki,E, Wei, X, Wang, X, Chang, JY, Swafford, J, Broemeling, L, Liao, Z. The prevalence of myocardial ischemia after concurrent chemoradiation therapy as detected by gated myocardial perfusion imaging in patients with esophageal cancer. J Nucl Med, 47(11):1756-62, November 2006.
  24. Won KS, Gayed I, Kim EE, Macapinlac, H. Juvenile fibroadenomaof the breast on 111 in-octreotide SPECT and F-18 FDG PET/CT. Eur J Nucl MedMol Imaging, 34(3):440, March 2007.
  25. Chang K, Sarkiss M, Won KS, Swafford J, Broemeling L, Gayed I. Preoperative risk stratification using gated myocardial perfusion studies in patients with cancer. J Nucl Med, 48(3):344-348 March 2007.
  26. Gayed I, Burke D, Won KS, et al. Effect of blunted hemodynamic response to adenosine on myocardial perfusion studies. Current Medical Imaging Review, 1:3 (3): 1-4, August 2007.
  27. Shioyama, Y, Jang, SY, Liu, HH, Guerrero, T, Wang, X, Gayed, IW, Erwin, WD, Liao, Z, Chang, JY, Jeter, M, Yaremko, BP, Borghero, YO, Cox, JD, Komaki, R, Mohan, R.Preserving functioning lung using perfusion imaging and intensity-modulated  radiation therapy for advanced stage non-small cell lung cancer. Int J RadiatOncolBiol Phys. 1; 68(5):1349-58, August 2007.
  28. Gayed, I,Eskandari, MF,McLaughlin, P, Pro, B, Diba, R, Esmaeli, B. Value of positron emission tomography in staging ocular adrenal lymphomas and evaluating their response to therapy. OphthalmicSurg Lasers Imaging, 38(4):319-25, July 2007.
  29. Fumovitz, M, Gayed I, Jhingran A, Euscher, ED, Coleman, RL, Ramirwz, PT, Levenback, CF.Lymphatic mapping and sentinel lymph node detection in women with vaginal cancer. GynecolOncol, 108(3):478-81, March 2008. 
  30. Won KS, Kim EE, Mar M, Erwin W, Wei W, Gohar S, Gayed I.Is iterative reconstruction an improvement over filtered back projection in processing gated myocardial perfusion SPECT?. The Open Medical Imaging Journal, 2(1):17-23, February 2008. 
  31. Gayed I, Joe Chang, E. Edmund, Kim, EE,  Nunez, R, Chasen, B, Liu, HH, Kobayashi, K, Zhang,Y, Liao, Z, Gohar, S, Jeter, M, Henderson, L, Erwin, W, Komaki, R.. Lung perfusion imagingcan risk stratify lung cancer patients for the development of pulmonary complications after chemoradiation. J ThoracOncol, 3(8):858-64, August 2008.
  32. Gayed I, Liu, HH, Wei, Z, Liao, Z, Yusuf, SW, Chang, JY, Bassett, R, Lomaki, R, Patterns of cardiac perfusion abnormalities after chemoradiotherapy in patients with lung cancer. J Thorac. Oncol, 4(2):179-84, February 2009.
  33. Esmaeli, B, McLaughlin, P, Pro, B, Samaniego, F, Gayed, I. Hagemister, F, Romaguera, J, Cabanillas, F, Neelapu, SS, Banay, R, Fayad, L, Saville,WM, Kwak, LW.Prospective trial of targeted radioimmunotherapy with Y-90 ibritumomabtiuxetan (Zevalin) for front-line treatment of early-stage extranodal indolent ocular adnexal lymphoma. Ann Oncol, 20 (4):709-14, April 2009.
  34. Gayed, I, Gohar, S, Liao, Z, McAleer, M, Bassett, R, Yusuf, SW:  The clinical implications of myocardial perfusion abnormalities in patients with esophageal or lung cancer after chemoradiation therapy.  Int J Cardiovasc Imaging, 25 (5):487-495, June 2009.
  35. Perrier, ND, Edeiken, B, Nunez, R, Gayed, I, Jimenez,C, Busaidy, N,Potylchansky, E, Kee, S, Vu,T.  A novel nomenclature to classify parathyroid adenomas.  World J Surg, 33(3):412-6, March 2009.
  36. Kobayashi, K, Ramirez, P, Kim, E, Levenback, F, Rohren, E, Frumovitz, M, Mar, M, Gayed, I:  Sentinel node mapping in vulvovaginal melanoma using SPECT/CT lymphoscintigraphy.  ClinNucl Med, 34(12): 859-61, December 2009.
  37. Roth, ES, Fetzer, DT, Barron BJ, Joseph, UA, Gayed, IW, Wan, DQ. Does colon cancer ever metastasize to bone first? A temporal analysis of colorectal cancer progression. BMC Cancer, 9:274 August 2007.
  38. Fearmonti, RM, Gayed, IW, Kim, E, Bedrosian, I, Hunt, KK, Meric-Bernstam, F, Feig, B, Ghonimi, E, Warneke, C, Babiera, GV.  Intra-individual comparison of lymphatic drainage patterns using subareolar and peritumoral isotope injection for breast cancer. Ann. Surg. Oncol 17(1):220-7, January 2010.
  39. Gayed,I,Wahba, H, Wan, D, Joseph, UA, Murthy, R. Effect of Y-90 SIR-spheres therapy for multiple liver metastases in a variety of tumors. J Cancer SciTher, 2(2):43-46, March 2010.
  40. Gayed, IW, Raslan, OA, Bhosale, PR, Perrier, ND, Wei, W, Gladish,G. Significant coronary calcification detected using contrast-enhanced computed tomography: Is it an indication for further investigation?ClinNucl Med, 35(6):404-8, June 2010.
  41. Camacho; LH, Garcia; S, Panchal; AM, Lim, J, Hong; HS,Ng, C, Madoff; DC, Fu; S, Gayed; I,Kurzrock, R: Exploratory study of hepatic arterial infusion oxaliplatin with systemic 5-fluorouracil/bevacizumab in refractory solid tumor patients with extensive liver metastases. Clinical Colorectal Cancer, 9(5):311-4, December 2010.
  42. Gayed, IW. Editorial. Research and Reports in Nuclear Medicine,1(1):9-10 June 2011.
  43. Gayed, I, Kim, EE,Awad, J, Joseph, UA, Wan, DQ, John, SD. The value of fused SPECT/CT in the evaluation of solitary skull lesion.ClinNucl Med, 36(7):538-41 July 2011.
  44. Gayed, I, Wan D, Beasley C, Joseph U, Awad J, John S. Impact of bone SPECT-CT imaging on evaluation of lower extremities’ abnormalities. Research and Reports in Nuclear Medicine, 2:1-9, 2012.
  45. Joseph, UA, Kothari, K, Skolkin, D, Wan, DQ, Gayed, IW. Technetium-99m ethylene cysteine dimer posterior fossa perfusion and brain death.Research and Reports in Nuclear Medicine, 2:11-15, 2012.
  46. Kim, HW, Won, KS, Zeon, SK, Ahn, BC, Gayed, IW. Peritoneal carcinomatosis in patients with ovarian cancer: enhanced CT versus 18F-FDG PET/CT. ClinNucl Med, 38(2):93-7, February 2013.
  47. Isis Gayed,Usha Joseph, Mina Fanous, David Wan, Mya Schiess, William Ondo, Kyoung-Sook Won, "The Impact of DaTscan in the Diagnosis of Parkinson Disease." ClinNucl Med, 40(5):390-3, May 2015.
  48. Isis W. Gayed, Ron J. Karni, David Q. Wan, Jeena M. Varghese, Kelly L. Wirfel,  Kyoung-Sook Won, Usha A. Joseph. Interpretation of Tc-99m Sestamibi Parathyroid SPECT CT Scans Made Easy for Better Surgical Outcomes in Patients with Primary Hyperparathyroidism. Reports in Medical Imaging. 2016:9.
  49. Isis Gayed, Vivian Salama, Lydia Dawood, Steven Canfield, David Wan, Chunyan Cai, Usha Joseph, Robert Amato. Optimizing Patient Selection for Therapy with Radium 223 Dichloride. Pending review by Molecular Imaging and Biology journal.
Book Chapters
  1. Gayed, Isis. Nuclear Cardiac Imaging in Cancer Patients. In: Cancer and the Heart. BC Decker Inc. -2006.

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