Arlene A Forastiere Kian Ang David Brizel Bruce Earl Brockstein Frank Dunphy David W Eisele Helmuth Goepfert Wesley L Hicks Merrill S Kies William M Lydiatt Ellie Maghami Thomas McCaffrey Bharat B Mittal David G Pfister Harlan A Pinto Marshall R Posner John A Ridge Sandeep Samant David E Schuller Jatin P Shah Sharon Spencer Andrew Trotti Richard H Wheeler Gregory T Wolf Frank Worden Bevan Yueh

seyed hosein tabatabaei department of oral pathology, social determinants of oral health research centre, school of dentistry, shahid sadoughi university of medical sciences, yazd, iran mahmood akhavan tafti department of pathology, school of medicine, shahid sadoughi university of medical sciences, yazd, iran bahareh yaghoobi school of dentistry, shahid sadoughi university of medical sciences, yazd, iran

mohammad taghi bahreyni toossi professor, medical physics research center, faculty of medicine, mashhad university of medical sciences, mashhad, iran eftekhar rajab bolokat m.sc., in medical physics, mashhad university of medical sciences, mashhad, iran raham salek m.sc., in medical engineering, medical physics research center, faculty of medicine, mashhad university of medical sciences, mashhad, iran shahram baiani associate professor, radiation oncology dept., omid hospital, mashhad university of medical sciences, mashhad, iran hamid gholamhoseinian ph.d., student, medical physics dept., faculty of medicine, mashhad university of medical sciences, mashhad, iran mohsen layegh m.sc., in medical physics, omid hospital, mashhad university of medical sciences, mashhad, iran.

j. rezaie h. peyvandi h.r. hallaj-mofrad a. khaji b. shakiba