摘要
目的研究应用16排螺旋CT回顾性心电(ECG)门控技术减少心脏运动的影响,改进心脏周围肺动脉影像质量的可行性,并确定最好的重建算法。方法对52例怀疑患有肺栓塞的患者(男性27例,女性25例,年龄30～81岁)进行了16排螺旋CT肺动脉造影检查,均分别进行了非ECG门控螺旋CT扫描(Helical)和回顾性ECG门控扫描。每位患者的影像均以非ECG门控螺旋算法和3种心电门控算法(CHR、MSR-2和MRS-4)显示。用每种ECG门控算法重建出5种心跳时间相位,即65%、70%、75%、80%、85%。心脏周围肺动脉评分标准为:很好3分,较好2分,差1分;血管的影像质量分别由5位专业放射学医师主观评价,然后计算算术平均值(MSV)。比较螺旋算法与每种心脏最佳相位算法的影像质量,并计算出最好影像质量时最佳算法的百分率。用统计学分析采用CT心电门控技术改进心脏周围肺动脉影像质量的可行性。结果各种算法的MSV,Helical为2.27±0.44,CHR为2.68±0.29,MSR-2为2.29±0.51,MSR-4为2.19±0.50。Helical组与CHR组的MSV比较差异有显著统计学意义(P<0.001),但Helical与其他心脏算法比较差异无统计学意义,MSR-2P=0.86,MSR-4P=0.40。CHR的MSV明显高于其他算法。出现肺动脉最高影像质量的最佳算法的百分率,Helical为27.6%,CHR为56.9%,MSR-2为11.6%,MSR-4为4.0%。CHR的影像质量明显高于其他算法。结论应用16排螺旋CT回顾性ECG门控技术、CHR算法能够通过减少心脏运动从而改进心脏周围肺动脉的影像质量。
Objective To study the feasibility of the retrospective ECG-gated 16-row multidetector spiral CT （MSCT） on improving image quality of pulmonary arteries around heart by cardiac motion reduction and determine the best reconstruction algorithm. Methods Fifty-two patients （male 27,female 25,aged 30 ~ 81 years） with suspected pulmonary embolism （PE） were enrolled in this study. All patients were performed retrospective ECG-gated and non-ECG-gated CT pulmonary angiography （CTPA） on 16-row MSCT. Each patient＇s image were displayed by different algorithms eg. non -ECG -gated ： simple helical （Helical） and retrospective ECG-gating： cycle of half reconstruction （CHR）, multi segment reconstruction-2 （MSR-2） and multi segment reconstruction-4（MSR-4）. Each ECG-gated algorithm was reconstructed by 5 temporal phases （65 % ,70 % ,75 %, 80 % and 85 % separately）. The scoring value for pulmonary arteries around heart and heart motion were estimated （grade 3：excellent;2： good; 1 ：poor） and the best ECG-gated algorithm were also subjectively evaluated by 5 independent radiologists through reviewing the images. Statistical tests were used to compare the mean scoring value of helical with that of the best phase of each ECG-gated algorithm and to calculate the rate of the best algorithm. The feasibility of the ECG-gated MSCT in improving image quality of pulmonary arteries around heart was determined by statistical analysis. Results The mean scoring values for pulmonary vessel were： Helical 2.27± 0.44,CHR 2.68 ± 0.29,MSR-2 2.29±0.51 ,MSR-4 2.19± 0.50. The mean scoring value was significantly different between helical and CHR （P 〈 0.001 ）,but not significantly different between helical and the other ECG -gated algorithms （MSR-2 ：P = 0.86 ; MSR -4 ： P = 0.40）. The mean scoring value of CHR was significantly higher than the other algorithms. The mean scoring value of ECG-gated algorithm was significantly higher than helical. The rate of best algorithm for pulmonary v
出处
《生物医学工程与临床》
CAS
2008年第2期111-115,共5页
Biomedical Engineering and Clinical Medicine
基金
"十五"国家科技攻关项目(2004BA703B07)
