Development of step-wedge phantom for Dental X-ray machine Quality Control test

Abstract

ABSTRACT The aim of this study was to development step wedge dental phantom which calibrated with the standard phantom for accuracy fitting; that used in quality control in dental x-ray radiography and film automatic processing machine. The phantom after has been checked and assimilated, were used in Quality Control for dental intra-oral machine. The result of this study showed that application of design phantom in QC showed similar Result as Standard Phantom. T-test was applied to test the significant difference between the two phantoms at P =0.05 in case of transmission using air, Cu and Pb where t-value were equal to 0.33, 0.07 and 1.6 Respective with p equal to 0.7 ,0.9and 0.2 respectively . Optical density also showed insignificant different between the two phantoms at p =0.05 with t value = 0.02 and p =045. The optical density result also showed an exponential response of absorbed radiation versus thickness of step wedge for design phantom it was y=0.8588+e0.0064 R2=0.7861 and for the standard phantom was y=0.7801+e 0.0456, R2=0.8978.