[Effect of Pulse Wave Synchronization on T1 Value in Cardiac T1 Mapping: Is Pulse Wave Synchronization a Substitute for Electrocardiogram Gating?]

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-10-20 Epub Date: 2024-08-23 DOI:10.6009/jjrt.2024-1458

Naoto Mori, Sadahiro Nakagawa, Kunihiro Iwata, Naka Sakamoto, Atsutaka Okizaki

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Abstract

Purpose: We investigated whether peripheral pulse synchronization (PPUS) can be an alternate method for electrocardiographic synchronization (ECGS) in measuring myocardial T1 values in cardiac magnetic resonance imaging (CMRI).

Methods: T1 map imaging was performed on 49 patients undergoing CMRI using the 5s (3s) 3s modified Look-Locker inversion recovery (MOLLI) method for both ECGS and PPUS. The short-axis images of basal, mid, and apical segments were obtained. The T1 map images were analyzed using an image processing system, and T1 values were obtained for each cardiac segment. To assess the degree of agreement between T1 values obtained from ECGS and PPUS, the Bland-Altman analysis and the estimating intraclass correlation coefficient (ICC) were performed for the average T1 value of the entire myocardium and T1 values of each cardiac segment. Also, to evaluate whether PPUS imaging is possible in the diastole phase, we measured the length of systole in the electrocardiogram and the length of transmission (R-R') from R in the electrocardiogram to R (R') in the pulse waveform.

Results: From the comparison of T1 values, a good agreement of ICC was confirmed between the ECGS and PPUS (whole myocardium: 0.97, apical: 0.93, mid: 0.98, and basal: 0.97). The results of the Bland-Altman analysis also indicated good agreement. Moreover, it was shown that the heart was imaged in the diastole phase even with the default scan parameters of PPUS.

Conclusion: Our results indicated that PPUS can be an alternate method for ECGS.

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[脉搏波同步对心脏 T1 图谱中 T1 值的影响：脉搏波同步是心电图门控的替代品吗？］

目的：我们研究了在心脏磁共振成像（CMRI）中测量心肌 T1 值时，外周脉冲同步（PPUS）是否可以作为心电同步（ECGS）的替代方法：对 49 名接受 CMRI 的患者进行了 T1 图成像，使用 5s (3s) 3s 改良 Look-Locker 反转恢复（MOLLI）方法同时测量 ECGS 和 PPUS。获得了基底、中段和顶端的短轴图像。使用图像处理系统分析 T1 图图像，获得每个心脏节段的 T1 值。为了评估 ECGS 和 PPUS 获得的 T1 值之间的一致程度，对整个心肌的平均 T1 值和每个心脏节段的 T1 值进行了 Bland-Altman 分析和类内相关系数（ICC）估算。此外，为了评估 PPUS 成像是否可以在舒张期进行，我们测量了心电图中收缩期的长度以及从心电图中的 R 到脉搏波形中的 R（R'）的传输长度（R-R'）：通过比较 T1 值，ECGS 和 PPUS 的 ICC 一致度良好（整个心肌：0.97；心尖：0.93；心中：0.98；心底：0.97）。Bland-Altman 分析的结果也表明两者的一致性很好。此外，即使使用 PPUS 的默认扫描参数，心脏也能在舒张期成像：我们的研究结果表明，PPUS 可以作为 ECGS 的替代方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Nihon Hoshasen Gijutsu Gakkai zasshi

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