心脏延迟增强MRI不同TI值对心肌梗死诊断效能的影响
Evaluation of the efficacy of delayed cardiac magnetic resonance imaging with different TI-values in dis-playing myocardial infarction
陆虹宇 1杨映霞 1黄涛 1蒋平平 1崔盟 1林华1
作者信息
- 1. 523021 广西南宁,广西壮族自治区人民医院放射科
- 折叠
摘要
目的:通过与TI值为300 ms的常规相位敏感反转恢复(PSIR)序列进行比较,探讨调整TI值为左室血池过零时PSIR序列心脏延迟增强MRI对心肌梗死的诊断效能.方法:将2022年3月-2022年12月在本院确诊为心肌梗死的35例患者纳入本研究.所有患者在静脉注射Gd-DTPA后10 min分别采用300 ms和血液过零时的TI值行PSIR序列延迟增强(LGE)扫描,扫描平面包括两腔心、四腔心及通过病变区的短轴位.测量并比较2种TI值LGE图像上正常心肌、心肌疤痕与心腔内血液的SNR、CNR和信号强度(SI)的差异及心肌梗死范围的差异.结果:调整TI后LGE图像上心肌疤痕区域与左心室血池的 CNR[24.58(16.80,48.51)vs.11.83(5.04,22.73),Z=-6.87,P＜0.05]更高,并能显示更大的梗死面积[4.20(2.10,7.55)mm2 vs.3.45(1.40,6.15)mm2,Z=-6.65,P＜0.05],且有更高的疤痕-血池信号强度差[366.80(258.75,432.60)vs.175.90(73.30,259.35),Z=-8.13,P＜0.05],更低的正常心肌-血池信号强度差[284.70(196.05,405.20)vs.511.20(394.55,636.70),Z=-8.07,P＜0.01].结论:调整TI后的PSIR序列心脏延迟增强扫描可以有效抑制心腔内血池信号,提高心肌疤痕与血池的对比,而且心内膜下和乳头肌的强化更明显而显示更清晰,从而可提高对梗死区域内心肌活性的检测敏感度.
Abstract
Objective:To explore the diagnostic efficacy of late gadolinium enhancement cardiac MRI(LGE-cMRI)using phase sensitive inversion recovery(PSIR)sequence with a adjusted TI at ze-ro crossing of the left ventricular blood pool for myocardial infarction by comparing it with PSIR using TI of 300ms.Methods:35 patients with confirmed myocardial infarction from March 2022 to December 2022 in our hospital were recruited.All patients underwent LGE-MRI scanning using PSIR sequence with TI of 300ms and TI of blood zero crossing after ten minutes of medication.The scanning plane in-cluded two-chamber,four-chamber and short-axis images passing through the lesion area.The diffe-rences of SNR,CNR and signal intensity(SI)in normal myocardium,myocadial scar and intracardiac blood,as well as the difference of myocardial infarct extent on the LGE images with the two TI-values were measured and compared.Results:After resetting TI,the myocadial scars and blood pool in left ventricular showed a higher CNR[24.58(16.80,48.51)vs.11.83(5.04,22.73),Z=-6.87,P＜0.05]and larger infarction area[4.20(2.10,7.55)vs.3.45(1.40,6.15),Z=-6.65,P＜0.05].There was a higher signal intensity difference between myocardial scars and[366.80(258.75,432.60)vs.175.90(73.30,259.35),Z=-8.13,P＜0.01],and a lower signal intensity difference between normal myocar-dium and blood pool in chambers of the heart[284.70(196.05,405.20)vs.511.20(394.55,636.70),Z=-8.07,P＜0.01].Conclusion:The PSIR sequence with adjusted TI in LGE-cMRI scan can effec-tively suppress intracardiac blood pool signals,improve the contrast between myocardial scar and blood pools,which is helpful to displaying subendocardial and papillary muscles more clearly,thus can improve the sensitivity of detecting myocardial activity in the infarction area.
关键词
心肌梗死/相位敏感反转恢复序列/磁共振成像/延迟强化/反转时间Key words
Myocardial infarction/Phase sensitive inversion recovery sequence/Magnetic reso-nance imaging/Late gadolinium enhancement/Inversion time引用本文复制引用
基金项目
广西卫生健康委员会自筹科研课题(Z20210103)
广西自然科学基金项目(2021GXNSFAA196062)
出版年
2024
NETL
NSTL
万方数据