CAJ | 학술논문

目的：研究双源CT双能量虚拟平扫技术在肝脏扫描中的应用价值。方法：对37例上腹部扫描患者行上腹部普通平扫及动脉期、门脉期双能量扫描。通过Liver VNC软件处理后，可以获得动脉期、门脉期虚拟平扫数据，并与普通平扫对比，比较其在平均CT值、信噪比（ SNR）、病灶检出率、图像质量及辐射剂量上的差异。结果：虚拟平扫和普通平扫在病灶检出率上无明显差异（P＞0．05）。虚拟平扫肝脏CT值高于普通平扫（P＜0．05）；虚拟平扫图像SNR高于普通平扫（P＜0．05）。两组虚拟平扫之间差异无统计学意义（P＞0．05）。虚拟平扫的图像质量均可满足临床诊断需求。应用虚拟平扫，可取消普通平扫，辐射剂量可降低34％。结论：双源CT的虚拟平扫技术在保证图像质量的前提下降低了辐射剂量，可取代普通平扫，具有临床应用的潜力。
목적：연구쌍원CT쌍능량허의평소기술재간장소묘중적응용개치。방법：대37례상복부소묘환자행상복부보통평소급동맥기、문맥기쌍능량소묘。통과Liver VNC연건처리후，가이획득동맥기、문맥기허의평소수거，병여보통평소대비，비교기재평균CT치、신조비（ SNR）、병조검출솔、도상질량급복사제량상적차이。결과：허의평소화보통평소재병조검출솔상무명현차이（P＞0．05）。허의평소간장CT치고우보통평소（P＜0．05）；허의평소도상SNR고우보통평소（P＜0．05）。량조허의평소지간차이무통계학의의（P＞0．05）。허의평소적도상질량균가만족림상진단수구。응용허의평소，가취소보통평소，복사제량가강저34％。결론：쌍원CT적허의평소기술재보증도상질량적전제하강저료복사제량，가취대보통평소，구유림상응용적잠력。
Objective:To evaluate the diagnostic value of applying virtual non-contrast scanning to liver lesions with dual-source,dual-energy computed tomography( CT) .Methods:Conventional non-enhanced abdominal CT scanning was performed in 37 patients,followed by scans during the hepatic arterial phase and portal phase with dual-source in dual-energy mode.The images were generated with the built-in liver VNC program for the raw data during the hepatic arterial phase and portal phase in virtual non-contrasted manner,and the previous data were compared with those obtained by conventional non-en-hanced scans regarding the differences of mean CT value,signal-to-noise ratio(SNR),focal lesions detected,imaging quality and radiation dose.Results:Although the focal lesions detected remained relatively comparable by either virtual or conventional non-contrasted scanning(P>0.05),yet the CT Hu values for liver were higher on virtual non-contrast CT images than the conventional counterparts(P<0.05),and virtual non-contrast CT also led to better SNR(P<0.05).Scans during the hepatic arterial phase and portal phase suggested no difference with the lesions detected(P>0.05),and generated sim-ilar diagnostic imaging quality .Virtual non-contrast CT,a substitute for the conventional non-enhanced tomography,was capable of reducing the radiation dose by 34%.Conclusion:Dual-source dual-energy CT may take the place of the conventional non-enhanced CT and be in wider clinical implications ,for it can reduce the level of ionizing radiation by generating favorable imaging quality .