心脏CTA心腔内成像VR阈值不透明度曲线的调制与应用研究

Research on modulation and application of intracardiac imaging VR threshold opacity curve in cardiac CTA

目的探讨通过调整容积再现成像阈值不透明度曲线以显示心腔结构的可行性。方法收集整理行心电门控冠状动脉CTA检查的96例患者资料,采用手动编辑的梯形阈值不透明度曲线对其进行容积再现成像处理,使用虚拟手术刀技术剖开心腔后,对左右心室腔的成像效果进行5分法评分,同时测量左右心室与室间隔CT值,通过spearman秩相关系数分析心室腔成像效果与心室CT值及心室/室间隔浓度比的相关性。结果心腔成像的效果与心室CT值及心室/室间隔浓度比呈高度正相关(rs=0.840、0.897,P均<0.01),对比剂充盈良好的左心室4分以上的病例达90.7%。结论具有足够对比剂浓度的心腔配合适当的阈值不透明度曲线可以获取满足诊断需要的图像,在对于以了解心腔或心脏瓣膜情况为目的的心脏CTA扫描中,调制出适合各自CT后处理工作站心腔内阈值不透明度曲线并将其应用到图像三维重建和诊断中是很有意义的。

Objective To investigate the feasibility of a new method displaying heart chamber structure by adjusting threshold opacity curve of volume rendering imaging.Methods It was collected and organized records of 96 patients accepting ECG-gated coronary artery CTA,conducted VR imaging process by manually editing trapezoidal threshold opacity curve,and applied 5-score evaluating system to assess imaging result of right and left ventricular chambers after opened cardiac chambers with virtual scalpel.Meanwhile,CT value of right ventricle and left ventricle and ventricular septum were measured.It was analyzed the correlation among ventricular chamber imaging result,ventricle CT value,and ventricle/Ventricular septum concentration ratio through Spearman＇s Rank Correlation Coefficient.Results There were a highly positive correlation between heart chamber imaging result and ventricle CT value ventricle/ventricular septum concentration ratio（rs=0.840 0.807,P〈0.01）.90.7% of left ventricles with good contrast media filling had shown 4-score above imaging quality.Conclusion The combination of heart chamber with adequate contract media concentration and appropriate threshold opacity curve can produce image required by diagnosis.For cadiac CTA scanning aiming at examination of heart chamber or cardiac valves,it is significant to modulate intracardiac threshold opacity curve adapted to corresponding CT post-processing working station and apply it into three-dimension image reconstruction diagnosis.