Last Name


First Name




Institutional Affiliations

Assistant professor of nuclear medicine,  University of Toronto

Research Interests

Research Focus

1- New radiotracers in PET/CT

2- HRpQCT in pediatric population


Publications Journals: 1.      Vali R, Bajno L, Kousha M, Charron M. The Potential Role of Radionuclide Imaging in Osteoporotic Vertebral Fracture and Sacral Fracture. Spine Research. 2016;1(1:11). Principal Author. 2.      Vali, R., A. Punnett, L. Bajno, R. Moineddin and A. Shammas. The value of F-FDG PET in pediatric patients with post-transplant lymphoproliferative disorder at initial diagnosis. Pediatr Transplant. 2015. Principal Author. 3.      Wehbi, E., A. Salle, N. Kanaroglou, A. Lorenzo, D. Bagli, M. Koyle, J. Billimek, R. Vali, M. Charron and J. L. Pippi Salle. Measurement of Differential Renal Function by Scintigraphy in Hydronephrotic Kidneys: Importance of Conjugate Views for Accurate Evaluation. J Urol. 2015. Coauthor or Collaborator. 4.      Vali, R., W. Loidl, C. Pirich, W. Langesteger and M. Beheshti. Imaging of prostate cancer with PET/CT using (18)F-Fluorocholine. Am J Nucl Med Mol Imaging. 2015;5(2):96-108. Principal Author. 5.      Vali, R., A. Daneman, S. McQuattie and A. Shammas. The value of repeat scintigraphy in patients with a high clinical suspicion for Meckel diverticulum after a negative or equivocal first Meckel scan. Pediatr Radiol. 2015;45(10):1506-1514. Principal Author. 6.      Vali, R., M. Rachmiel, J. Hamilton, M. El Zein, J. Wasserman, D. L. Costantini, M. Charron and A. Daneman . “The role of ultrasound in the follow-up of children with differentiated thyroid cancer.”. Pediatr Radiol. 2015;45(7):1039-1045. Principal Author. 7.      El Zein M, Vali R, Charron M, Manson D, Perlman K, Shammas A. Neuroendocrine tumor in liver with positive ACTH receptor: a case report. J Pediatr Hematol Oncol. 2014 Jan 1;36(1):e1-4. 8.      Vali R, Langesteger W, Beheshti M. The role of F18-choline in prostate cancer. American Journal of Nuclear Medicine. 2014. (Review). Principal Author. 9.      Vali R, Ranson M, Harvey E, Shammas A. False-positive In-111 DTPA octreotide scintigraphy in bilateral tibial stress fracture. Pediatric Radiology. 2014. Principal Author. 10.   Widjaja E, Shammas A, Vali R, Otsubo H, Ochi A, Snead OC, Go C, Charron M. FDG-PET and magnetoencephalography in presurgical workup of children with localization-related nonlesional epilepsy. Epilepsia. 2013 Apr 1;54(4):691-9. 11.   Shammas A, Vali R, Charron M. Pediatric nuclear medicine in acute care. Semin Nucl Med. 2013 Mar 1;43(2):139-56. 12.   Costantini D, Vali R, Chan, J, McQuattie S, Charron M. Dual time point FDG PET/CT for the evaluation of pediatric tumors. AJR Am J Roentgenol. 2013 Feb;200(2):408-13. 13.   Strobel K, Vali R. 18F-NAF PET/CT versus conventional bone scanning in the assessment of benign bone disease. PET Clinics. 2012 Jul;7(3):249-261. Clinical utility of 18F NAF PET/CT in benign and malignant disorders. ISSN:1556-8598, ISBN:978-1-4557-4886-0. 14.   Beheshti M, Imamovic L, Broinger G, Vali R, Waldenberger P, Stoiber F, Nader M, Gruy B, Janetschek G, Langsteger W. 18F choline PET/CT in the preoperative staging of prostate cancer in patients with intermediate or high risk of extracapsular disease: a prospective study of 130 patients. Radiology. 2010 Mar;254(3):925-33. 15.   Beheshti M, Vali R, Waldenberger P, Fitz F, Nader M, Hammer J, Loidl W, Pirich C, Fogelman I, Langsteger W. The use of F-18 choline PET in the assessment of bone metastases in prostate cancer: correlation with morphological changes on CT. Molecular Imaging and Biology. 2010 Jan;12(1):98-107. 16.   Beheshti M, Pöcher S, Vali R, Waldenberger P, Broinger G, Nader M, Kohlfüst S, Pirich Dralle H, Langsteger W. The value of F-18 DOPA PET – CT in patients with medullary thyroid carcinoma: comparison with F-18 FDG PET – CT. Eur Radiol. 2009 Jun;19(6):1425-34. 17.   Beheshti M, Vali R, Waldenberger P, Fitz F, Nader M, Loidl W, Broinger G, Stoiber F, Fogelman I, Langsteger W. Detection of bone metastases in patients with prostate cancer by F-18 Fluorocholine and F-18 Fluoride PET-CT: a comparative study. Eur J Nucl Med Mol I. 2008;35(10):1766-74. 18.   Beheshti M, Vali R, Langsteger W. 18Ffluorocholine PET/CT in the assessment of bone metastases in prostate cancer. Eur J Nucl Med Mol I. 2007;34(8):1316-7. 19.   Beheshti M, Li S, Vali R, Schima W, Dudczak R, Langsteger W. The potential value of F-18 FDG PET in comparison to CT in early prediction of response to Imatinib (STI571) therapy in patients with gastrointestinal stromal tumors. Iran J Nucl Med. 2007;15(2). (Serial No. 28) ISSN: 1691-2824. 20.   Vakili A, Eftekhari M, Fard A, Vali R, Saghari M, Derakhshan S. Tc99m RBC scan in evaluation of mycotic aneurysm. The Iranian Journal of Nuclear Medicine. 1999(10 & 11). Winter & Summer.   21.   Eftekhari M, Mehrazin A, Vali R, Vakili A, Fard A, Saghari M. Evaluation of ocular hydroxy apatite implant with TC99m MDP bone scan. The Iranian Journal of Nuclear Medicine. 1998(8 & 9). Winter & Summer. Books: 1.      Vali R, Shammas A. Acute care in pediatric nuclear medicine. In: Clinical pediatric nuclear medicine. 2015. Principal Author. 2.      Vali R, Charron M. Pediatric Nuclear Oncology. In: Cumali Aktolun, MD, MSc, and Stanley J. Goldsmith, MD, editor(s). Nuclear Oncology. 2014. ISBN 978-1-4511-8685-7. Principal Author. 3.      Vali R, Charron M. Nuclear medicine in pediatric gastrointestinal tract. In: Walker’s Pediatric gastrointestinal disease: physiology, diagnosis, management. 6th ed. 2014. 4.      Langsteger W, Beheshti M, Vali R, Beri A, Nader M, Janetschek G. Prostate cancer. In: Advances in nuclear oncology: diagnosis and therapy. Informa Healthcare; 2007. ISBN 9781841846149. 5.      Barfett J, Vali R, Shammas A. Basic of PET/CT. In: Pediatric nuclear oncology. Coauthor or Collaborator. 6.      Vali R, Charron M. Pediatric Renal Nuclear Medicine. In: Docimo, SG, Canning, DA, Khoury, AE (Supervising Editors), Austin, P, Coplen, D, Copp, H, Herndon, CDA, Lorenzo, A, Merguerian, P, Ost, M, Park, J, Shukla, A (Editors) :, editor(s). The Kelalis-King-Belman. Textbook of Clinical Pediatric Urology. Sixth Edition; 2016. Principal Author. 7.      Langsteger W, Vali R, Beheshti M. Prostate Cancer, Molecular anatomic Imaging. In: PET/CT, PET/MR, and SPECT/CT. ISBN 978-1-4511-9266-7. Coauthor or Collaborator.