后置滤过器对64排螺旋CT冠状动脉成像质量影响的CATPHAN模型研究  

Effect of various post-processing filters on image quality of 64-slice CT coronary angiography by using a Catphan phantom

作　　者：Syed Shareef Fahad 宦坚[1] 张伟[1] 龚建平[1] 乔方[1] 朱建兵[1] 陈光强[1] 

机构地区：[1]苏州大学附属第二医院影像诊断科,江苏苏州215004

出　　处：《苏州大学学报（医学版）》2012年第1期74-75,130,共3页Suzhou University Journal of Medical Science

基　　金：苏州市社会发展基金资助项目(YJS0929)

摘　　要：目的探讨不同后置滤过器对64排螺旋CT冠状动脉成像(CTCA)质量的影响。方法使用GE Light-Speed VCT机,采用120 kV,600 mA,0.35s/360°,层厚0.625 mm,pitch 0.2对Catphan 600模型进行扫描。采像后对原始图像分别进行不使用后置滤过器和使用后置滤过器C1、C2、C3重建,得到4组图像(NUC组、UC1组、UC2组和UC3组)。测量图像噪声(SD),计算对比噪声比(CNR)、信噪比(SNR)、调制传输函数(MTF)。统计分析采用单因素方差分析。结果 NUC组、UC1组、UC2组和UC3组的SD、CNR、SNR及MTF 50%差异均有高度统计学意义(均P<0.001),NUC组、UC1组和UC2组的MTF 10%差异无统计学意义(均P>0.05);UC3组与其余3组的MTF 10%差异有高度统计学意义(均P<0.01)。结论不同后置滤过器对CTCA图像SD、CNR、SNR和MTF的影响不同,可根据不同临床需要适当选择。Objective To evaluate the effect of various post-processing filters on image quality of 64-Slice CT coronary angiography.Methods Catphan 600 underwent cardiac scans by using GE LightSpeed VCT.The scan techniques undergone at 120 kV,600 mA,speed of 0.35 s per 360° rotation,pitch of 0.20,slice thickness of 625 mm.Cardiac images were reconstructed by using filters of C1（UC1）,C2（UC2）,C3（UC3） and were constracted without filter（NUC） to create four image sets from the same scanning.Image noises were measured,and CNR,SNR,MTF were calculated for the four sets.Dif-ference was examined by using one-way analysis of variance.Results Significant difference was found in terms of SD、CNR、SNR、 MTF 50%（P0.001）.No significant difference was found in terms of MTF 10% in NUC,UC1 and UC2（P0.05）.MTF 10% was significantly lower for UC3 than fhat for the other three sets（P0.05）.Conclusion Different post-processing filters should be selected according to the clinical requirements,because of their different effect on SD、CNR、SNR and MTF.

关 键 词：冠状动脉 体层摄影术 X线计算机 血管造影术 滤过器 

分 类 号：R814.42[医药卫生—影像医学与核医学] R816.2[医药卫生—放射医学]