双源CT双能量虚拟平扫在胆系结石检查中的价值

Dual energy virtual non-enhanced CT detection of bile duct stones

目的：探讨双源CT在腹部增强扫描中双能量虚拟平扫检查胆系结石的价值。方法对100例（男55例，女45例，年龄37～81岁）怀疑胆系疾病的患者均行Simens双源CT上腹部常规平扫及双能量增强扫描，并利用Liver VNC软件处理得到虚拟平扫数据，由3名医师通过双盲法对两组图像进行胆系结石诊断，将两组图像的诊断结果及辐射剂量进行比较。结果100例患者中，有66例经手术证实存在胆系结石。常规平扫检出64例，检出率为96.97%；虚拟平扫检出62例，检出率为93.94%，两者检出率差异无统计学意义。虚拟平扫与常规平扫单次辐射剂量CTDIvol分别为（12.54±1.83）mGy及（9.24±1.67） mGy，两者差异有统计学意义。结论虚拟CT平扫及常规CT平扫在检出胆系结石中具有很高一致性，双能量虚拟平扫对大部分胆系结石而言可基本取代上腹部常规平扫。

Objective To assess the value of virtual non-enhanced CT（VNCT）for detecting gallstones.Methods 100 patients with suspected bile duct stones underwent conventional non-enhanced CT（CNCT）,enhanced CT and VNCT using a dual-source CT scanner.The VNCT data were post-processed using the liver VNC software.The images of VNCT and CNCT were reviewed by three experienced radiologists independently to diagnose the presence and location of stones.The diagnostic results and radiation doses of both modalities were compared.Results There was no significant difference in the detection rate of 66 patients with surgically confirmed bile duct stones between CNCT（64/66,96.97%）and VNCT（62/66,93.94%）.The radiation dose of VNCT（9.24±1.67 mGy）was significantly lower than that of CNCT（12.54±1.83 mGy）.Conclusion There is high agreement between VNCT and CNCT in bile duct stone detection.VNCT can be used clinically for reduction of radiation exposure.