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.
黄锦锋,陈晓朝,王宏. 口腔锥形束CT关键参数检测方法的研究[J]. 计量学报, 2021, 42(3): 375-379.
HUANG Jin-feng,CHEN Xiao-zhao,WANG Hong. Research on the Detection Method of Key Parameters of Oral and Maxillofacial CBCT. Acta Metrologica Sinica, 2021, 42(3): 375-379.
［1］时飞跃,田书畅,金洵, 等. 瓦里安OBI系统锥形束CT图像CT值长期稳定性分析［J］. 计量学报, 2020, 41(1): 103-108.
Shi F Y,Tian S C,Jin X,et al. Long-term Constancy Analysis of CT Numbers for Cone-beam CT Images of a Varian OBI System［J］. Acta Metrologica Sinica, 2020, 41(1): 103-108.
［2］高翔,石丽婉,傅丽蓉, 等. 基于JJG(闽)1086-2018放射治疗CT模拟定位机X射线辐射源的质控分析［J］. 计量学报, 2020, 41(6): 743-747.
Gao X,Shi L W,Fu L R,et al. Study on the Quality Control for Computed-tomography Simulators Based on JJG1086-2018［J］. Acta Metrologica Sinica, 2020, 41(6): 743-747.
［3］郝艳梅, 黄建微, 李德红, 等. 球形石墨空腔电离室壁修正因子模拟计算［J］. 计量学报, 2019, 40(3): 522-525.
Hao Y M, Huang J W, Li D H, et al. Monte-Carlo Simulation about Wall Correction Factor for the Spherical Graphite Cavity Chamber［J］. Acta Metrologica Sinica, 2019, 40(3): 522-525.
［4］廖振宇, 吴金杰, 屈国普, 等. CT电离室校准条件的建立与模拟［J］. 计量学报, 2016, 37(6): 663-666.
Liao Z Y, Wu J J, Qu G P, et al. Establishment and Simulation of Calibration Conditions for CT Chamber［J］. Acta Metrologica Sinica, 2016, 37(6): 663-666.
［5］李德红, 成建波, 王培玮, 等. γ射线空气比释动能测量不确定度分析［J］. 计量学报, 2016, 37(4): 444-447.
Li D H, Cheng J B, Wang P W, et al. Uncertainty Analysis for Determination of Air Kerma in γ-ray Beam［J］. Acta Metrologica Sinica, 2016, 37(4): 444-447.
［6］HPA-RPD-065 Recommendations for the Design of X-ray Facilities and the Quality Assurance of Dental Cone Beam CT (Computed Tomography) Systems ［S］.
［7］王甜甜, 余晓锷. CT系统空间分辨率测量技术的改进［J］. 计量学报, 2012, 33(2): 187-192.
Wang T T, Yu X E. An Improved Method for the Measurement of Spatial Resolution in CT System［J］. Acta Metrologica Sinica, 2012, 33(2): 187-192.
［8］DIN 6868-161 Image Quality Assurance in Diagnostic X-ray Departments-Part 161: RV Acceptance Testing of Dental Radiographic Equipment for Digital Cone-Beam Computed Tomography［S］.
［9］Gala H de Las H, Torresin A, Dasu A, et al. Quality control in cone-beam computed tomography (CBCT) EFOMP-ESTRO-IAEA protocol (summary report) ［J］. Physica Medica, 2017, 39: 67-72.
［10］李杰. 医用磁共振成像系统检测方法的研究与评定［J］. 计量学报, 2014, 35(2): 184-187.
Li J. Research and Evaluation on the Method of Detection for Medical Magnetic Resonance Imaging System［J］. Acta Metrologica Sinica, 2014, 35(2): 184-187.
［11］JJG 961-2017医用诊断螺旋计算机断层摄影装置(CT)X射线辐射源检定规程［S］.
［12］Pauwels R, Thongvigitmanee S, Aootaphao S, et al. Evaluation of technical image quality and radiation dose of a Thai cone-beam CT scanner ［J］. CU Dent J, 2017, 40: 27-38.
2021, Vol. 42 
