智能最佳管电压（CAREkV）技术改善腹部CT图像质量和辐射剂量的价值

目的：研究智能最佳管电压(CARE kV)技术改善腹部CT图像质量和辐射剂量的价值。方法选择2012年4月至2015年4月在我院接受腹部CT增强扫描的患者80例进行研究，随机分成观察组及对照组40例，对照组使用常规滤波反投影法及CARE DOSE 4D进行图像处理，而观察组则使用迭代重建算法及CARE kV技术，对比两组有效辐射剂量、动静脉期的SNR及CNR指标水平。结果观察组的有效辐射剂量ED、CTDIvol及DLP水平均分别显著低于对照组，观察组扫描动脉期的肝脏的SNR，胰腺、肾脏、腹主动脉SNR及CNR水平均分别显著高于对照组；观察组扫描静脉期的肝脏SNR及CNR、胰腺SNR、肾脏SNR及CNR，以及门静脉SNR及CNR水平均分别显著高于对照组，差异均有统计学意义(P＜0.05)。两组扫描动脉期的肝脏CNR、静脉期的胰腺CNR相比，差异无统计学意义(P＞0.05)。结论 CARE kV技术对腹部多层CT检查图像的信噪比以及有效辐射剂量均有较好的改善作用，对于图像质量的提高效果明显，安全性较高，值得在临床检查过程中推广应用。

The Value of Improving Image Quality and Radiation Dose of Abdominal CT by the Technology of Intelligent Best Tube Voltage (CARE kV)

Objective To study the value of improving image quality and radiation dose of abdominal CT by the technology of intelligent best tube voltage (CARE kV). Methods A total of 80 cases from April 2012 to April 2015 in our hospital received abdominal CT scans were selected for study, which were randomly divided into observation group and control group with 40 cases in each group, the control group was used conventional iflter back projection method and CARE DOSE 4D for image processing, while the observation group was used iterative reconstruction algorithm and CARE kV technology. The effective radiation dose level, scanning, static arterial phase SNR and CNR level enhancement were compared respectively. Results Observation group of effective radiation doses of ED, CTDIvol and DLP level were signiifcantly lower than the control group. Observation group on arterial phase scanning, the SNR of livers, pancreatic SNR and CNR, kidney SNR and CNR, and abdominal aorta in SNR and CNR level were markedly higher than those in the control group. Observation group’s venous phase scanning of liver SNR and CNR, pancreatic SNR, kidney SNR and CNR, and portal vein SNR and CNR level were markedly higher than those in the control group, the differences were statistically signiifcant (P<0.05). Compared two groups of arterial phase scanning of liver CNR and pancreatic venous phase scan CNR, there was no statistically signiifcant difference (P>0.05). Conclusion The CARE kV technology of abdominal multi-slice CT image signal to noise ratio and effective radiation dose has good effect, obviously for the improvement of image quality, high security, which is worth for clinical examination in the process of popularization and application.