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
Syed Shareef Fahad 1宦坚 1张伟 1龚建平 1乔方 1朱建兵 1陈光强1
作者信息
- 1. 苏州大学附属第二医院影像诊断科,江苏苏州215004
- 折叠
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 LightSpeed 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.
Abstract
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 Cl ( 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. Difference was examined by using one-way analysis of variance. Results Significant difference was found in terms of SD,CNR,SNR, MTF 50% (P <0. 001). No significant difference was found in terms of MTF 10% in NUC, UC1 and UC2 (P > 0.05). MTF 10% was significantly lower for UC3 than fhat for the other three sets (P<0.05). 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Key words
coronary artery/tomography/X-ray computed/angiography/filter引用本文复制引用
基金项目
苏州市社会发展基金资助项目(YJS0929)
出版年
2012
NETL
NSTL
维普
万方数据