摘要:
Objective To study the manual control respiratory rhythm trigger acquisition (MCRRTA)technology in improving image quality and shortening acquisition time of the low-field MRCP scan.Methods 40 patients underwent MRCP scans using both automatic respiratory rhythm trigger acquisition (ARRTA)and MCRRTA,and the acquisition time and image quality were also ana-lyzed.Results The acquisition time of MRCP using ARRTA and MCRRTA were 675.13 ± 35.89 s and 546.38 ± 30.61 s respec-tively,exhibiting significant differences using the paired sample t-test (t=13.85,P=0.000).In ARRTA group,the scores of the image quality were 4 in 11 cases (11/40,27.5%);3 in 18 cases (18/40,45.0%);2 in 10 cases (10/40,25.0%);and 1 in only 1 case (1/40,2.5%),respectively.In MCRRTA group,the scores of the image quality were 4 in 25 cases (25/40,65.5%);3 in 10 cases (10/40,25.0%);2 in 5 cases (5/40,12.5%);and no case with 1 score (0/40,0%),respectively.The differences in image quality between two groups were statistically significant using the wilcoxon rank sum test (Z=-3.036,P=0.002).Conclusion MCRRTA technology in low-field MRCP scans can improve significantly image quality and shorten examination time.%目的:探讨人工调节呼吸节律触发图像采集对低场磁共振 MRCP图像质量及采集时间的影响。方法40例行磁共振胰胆管成像技术(MRCP)检查的患者先后采用常规呼吸节律触发采集(ARRTA)和人工调节呼吸节律触发采集(MCRRTA)2种方式进行图像采集,对2种方式下的图像采集时间和图像质量进行统计学分析。结果 ARRTA 方式采集时间为(675.13±35.89)s, MCRRTA方式采集时间为(546.38±30.61)s。经配对样本t检验,2组间差异具有统计学意义(t=13.85,P=0.000)。ARRTA方式的4分图像11例,占27.5%(11/40);3分图像18例,占45.0%(18/40);2分图像10例,占25.0%(10/40);1分图像1例,占2.5%(1/40)。MCRRTA方式的4分图像25例,占65.5%(25/40);3分图像10例,占25.0%(10/40);2分图像5例,占12.5%(5/40);1分图像0例,占0%(0/40)。经过Wilcoxon秩和检验,2组间差异具有统计学意义(Z=-3.036,P=0.002)。结论在低场强 MRCP成像时,采用人工调节呼吸节律触发采集方法可以明显提高患者的 MRCP图像质量,并可减少患者的检查时间。