Study Of The Relation Between Mastoid Pneumatization And Degree Of Retraction Pocket Using Digital Image Processing Technique Mahmoud Abd Klghfar MD, Mossad Elsisi MD, Mohamed ALy MD, Ahmed S . Klkady MD, Abou-Bakr E. Ras MD, Mohscn Abd Elrazek MD and Soliman N* MD Departments of Otorhinolaryngology and Radiology*. Faculty of medicine. Benha and Mansoitra* universities. Egypt. Abstract The clinical significance of the mastoid air cell system has been much discussed. It is suggested, that the mastoid plays a role in middle ear pressure regulation and that mastoid size is a factor in middle ear pressure regulation. The aim of the present study was to measure the volume and surface area of the mastoid air cell system in both control subjects and patients with retraction pockets using digital image processing method and to study the relation bet