CAJ | 학술논문

目的：探讨噪声和血管增强程度对CT血管成像（computed tomography angiography，CTA）后处理图像质量的影响。方法将临床需行下肢动脉CTA的61例患者随机分为3组，采用不同管电压和管电流扫描，对图像行容积再现（volume rendering，VR）和最大强度投影（maximum intensity projection，MIP）后处理并评价图像质量；测量血管增强CT值和对比度、图像噪声（N）、背景信号、信噪比（signal-to-noise ratio，SNR）和对比噪声比（contrast-to-noise ratio，CNR），分析VR、MIP图像质量与CNR、SNR、N的相关性。结果 VR、MIP图像质量与CNR相关性最高，其次为SNR（P<0.001）；3组病例之间血管增强CT值、背景信号和N的差异有统计学意义（P<0.05），而CNR与SNR的差异无统计学意义（P>0.05）；3组病例间VR与MIP的图像质量无统计学差别（P>0.05）。结论血管增强CT值和对比度是影响CTA后处理图像质量的关键因素。
목적：탐토조성화혈관증강정도대CT혈관성상（computed tomography angiography，CTA）후처리도상질량적영향。방법장림상수행하지동맥CTA적61례환자수궤분위3조，채용불동관전압화관전류소묘，대도상행용적재현（volume rendering，VR）화최대강도투영（maximum intensity projection，MIP）후처리병평개도상질량；측량혈관증강CT치화대비도、도상조성（N）、배경신호、신조비（signal-to-noise ratio，SNR）화대비조성비（contrast-to-noise ratio，CNR），분석VR、MIP도상질량여CNR、SNR、N적상관성。결과 VR、MIP도상질량여CNR상관성최고，기차위SNR（P<0.001）；3조병례지간혈관증강CT치、배경신호화N적차이유통계학의의（P<0.05），이CNR여SNR적차이무통계학의의（P>0.05）；3조병례간VR여MIP적도상질량무통계학차별（P>0.05）。결론혈관증강CT치화대비도시영향CTA후처리도상질량적관건인소。
Objective To investigate the effect of noise and vascular contrast enhancement on quality of post-processed images of computed tomography angiography(CTA).Methods 61 patients referred for lower extremity CTA were randomly divided into 3 groups with different tube current and kilovoltage during scanning.Quality of the volume rendering(VR)and maximum intensity projection(MIP)images,intravascular enhanced CT values and contrast,noise,background densities,signal-to-noise ratio(SNR) and contrast-to-noise ratio(CNR)were evaluated.The correlation between CNR,SNR,noise and image quality of VR and MIP was determined.Results CNR was most significantly(P<0.001)correlated with image quality of VR and MIP,followed by SNR. There were significant differences(P<0.05)in the intravascular enhanced CT values,background densities and noise among the 3 groups whereas differences in CNR and SNR as well as image quality of VR and MIP among the 3 groups were not significant(P>0.05). Conclusion Intravascular enhanced CT value and contrast are key factors in the quality of post-processed CTA images.