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目的探讨64排CT不同个性化重建方法在冠状动脉成像中的应用价值。方法收集我院2005-06—2006-06常规重建不满意而进行个性化重建后达到诊断要求的患者42例(男28例,女14例,平均年龄56.7岁);扫描采用TOSHIBA(Aquilion)64排螺旋CT(120 kV、400 mA、0.5 mm、0.4 s/r)进行数据采集;对这些患者分别进行绝对期相和相对期相重建。结果高心率患者好的相对期相重建平均为40%R-R间期(范围20%~60%),绝对期相平均为350 ms(范围200~600 ms)。心律失常的患者相对期相重建均未达到诊断要求,绝对期相重建对图像质量有较大的改善,绝对期相平均为380 ms(范围300~420 ms)。结论绝对期相重建后的图像质量要好于相对期相重建后的图像质量;低心率患者好的重建图像质量多位于舒张中期,高心率患者好的重建图像质量多位于收缩末期和舒张早期。
Objective To explore the value of 64-slice CT in the reconstruction of coronary artery by using different personalized reconstruction methods. Methods Totally 42 patients (28 males and 14 females, mean age 56.7 years) who met the diagnostic requirements after reconstruction were dissatisfied with the routine reconstruction were enrolled in our hospital from June 2005 to June 2006. TOSHIBA (Aquilion) 64 Data were acquired by helical CT (120 kV, 400 mA, 0.5 mm, 0.4 s / r); these patients were reconstructed in both absolute and relative phases. Results The good relative phase reconstruction in patients with high heart rate averaged 40% R-R interval (range 20% -60%) and absolute phase averaged 350 ms (range 200-600 ms). The relative phase reconstruction of patients with arrhythmia did not meet the diagnostic requirements, and the absolute phase reconstruction had a significant improvement on the image quality. The average absolute phase was 380 ms (range 300-420 ms). Conclusion The reconstructed image of absolute phase is better than the reconstructed image of relative phase. The reconstructed image quality of patients with low heart rate is mostly in mid-diastole, and the good reconstructed image quality of patients with high heart rate is mostly in the end-systole and early diastole.