Abstract：Objective The purpose of this study was to evaluate the consequences of different tube voltages on radiation dose and image quality with an automatic tube current modulation (ATCM) system on CT scanning of chest. Methods The chest phantom was scanned on GE Optima CT 680 scanner. Images were obtained at varying tube voltage (80, 100, and 120 kVp) and varying noise index (10, 15, 20, 25 and 30) with an ATCM system. Volumetric CT dose index (CTDIvol) and dose-length product (DLP) was recorded in the CT scanner. The objective noise of images were measured. Two experienced radiologists blinded to the CT parameters were invited to assess the identification of ground glass nodules (GGN). Results There was no significant difference in objective noise at the same NI level besides NI of 10. The DLP of scanning at tube voltage of 80 kVp increased by 21.96, 16.25, 9.18, 6.37 mGy·cm compared with that of 120 kVp at the NI of 15, 20, 25 and 30. The DLP increased by 14.05，8.50, 5.17 and 3.65 mGy·cm respectively at tube voltage of 100 kVp compared with that of 120 kVp at the NI of 15, 20, 25 and 30. There is no significant difference in the assessment of GGN among the varying tube voltage settings at the same NI level. Kappa value of the identification of the GGNs was substantial or almost perfect. Conclusion The image quality is not significantly affected by the different tube voltages based on ATCM system. The radiation dose of patients is decreased with the increasing of tube voltage.
袁颖a，卢东生b，钟朝辉a. 管电压对胸部CT图像质量及辐射剂量的影响[J]. 中国医疗设备, 2018, 33(2): 69-72.
YUAN Yinga, LU Dongshengb, ZHONG Zhaohuia. Impact of Tube Voltage on Chest CT Image Quality and Dose of Radiation. China Medical Devices, 2018, 33(2): 69-72.
