iDose4迭代重建与滤波反投影重建在CCTA图像中的应用价值比较

Comparison of values of iDose4 iterative reconstruction and filtered back projection reconstruction for coronary CT angiography

目的:探讨iDose4迭代重建在冠状动脉CT血管造影(coronary CT angiography,CCTA)中的应用价值。方法:选择冠心病患者124例,均行CT扫描iDose4迭代重建与滤波反投影(filtered back-projection,FBP)重建。iDose4迭代重建患者依体质量指数(body mass index,BMI)进行分组,BMI≥20 kg/m2为迭代组1(135 k V),共56人,BMI<20 kg/m2为迭代组2(110 k V),共68人;FBP组均采用110 k V管电压进行扫描。分别对信噪比(signal noise ratio,SNR)、对比噪声比(contrast to noise ratio,CNR)及图像质量进行比较分析。结果:迭代组1与FBP组的SNR、CNR、辐射剂量及图像质量评分差异均存在且差异具有统计学意义(P<0.05)。迭代组2与FBP组的CNR及辐射剂量差异均存在且差异具有统计学意义(P<0.05),SNR、图像质量评分差异不具有统计学意义(P>0.05)。结论:低压iDose4重建法在64排CCTA中辐射剂量小且图像质量好,值得在临床中推广应用。

Objective To explore the value of iDose4 iterative reconstruction for coronary CT angiography （CCTA）. Methods Totally 124 coronary heart disease patients underwent iDose4 iterative reconstruction and filtered back projection （FBP） reconstruction, of whom, 56 ones with BMI not less than 20 kg/m2 were put into No.1 iteration group using 135 kV tube voltage and 68 ones with BM1 less than 20 kg/m2 were into No.2 iteration group using 1 l0 kV tube voltage. FBP reconstruction was executed with 110 kV tube voltage. Comparison analyses were carried out on signal noise ratio （SNR）, contrast to noise ratio （CNR） and image quality. Results There were significant differences between the values of SNR, radiation dose and image quality in No. 1 iteration group and FBP group （P〈0.05）. Statistical differences were also found between the values of CNR and radiation dose in No.2 iteration group and FBP group, while there were no obvious differences between the values of SNR and image quality in the above two groups （P〈0.05）. Conclusion Low-voltage iDose reconstruction gains advantages in radiation dose and image quality during 64-slice CCTA, and thus is worthy promoting clinically. [Chinese Medical Equip- ment Journal,2017,38（5） ：79-81,91]