Abstract The imaging principle of CBCT is different from the traditional CT. The detection method of the original spiral CT is not suitable for the oral CBCT. For the characteristics of oral CBCT, the detection methods of key parameters are studied, including dose area product, spatial resolution, contrast-to-noise ratio index, uniformity. The advantages of the new method compared with the traditional method are expounded, and the corresponding analytical calculation methods and the actual test results are given. Except that the dose area product method is not suitable for Newton VG equipment, the test results of other equipments meet the following requirements: The corresponding measurement performance indicators of these parameters should be satisfied: the normalized dose area product should be no more than 250mGy·cm2; the measured value at 10% of MTF should be no less than 1LP/mm; CNI should be less than 20%; the uniformity should be greater than 5.
HUANG Jin-feng,CHEN Xiao-zhao,WANG Hong. Research on the Detection Method of Key Parameters of Oral and Maxillofacial CBCT[J]. Acta Metrologica Sinica, 2021, 42(3): 375-379.
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2021, Vol. 42 
