Modulation transfer function measurement of three-dimensional T1-weighted turbo spin echo sequence with low refocusing flip angles using single-plate method
Modulation transfer function measurement of three-dimensional T1-weighted turbo spin echo sequence with low refocusing flip angles using single-plate method
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DOI：
10.1007/s12194-023-00711-8
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发表时间：
2023-03-26
影响因子：
1.6
通讯作者：
Machida，Yoshio
中科院分区：
文献类型：
--
作者：
Yoshida，Rei;Machida，Yoshio
本研究的目的是证明调制传递函数（MTF）测量使用单板方法的有用性，以评估取决于三个参数的分辨率特性的变化：回波链长度（ETL），低重聚焦翻转角（RFA），和启动回波在三维T1加权涡轮自旋回波（TSE）与低RFA和优化这些参数。尽管在RFA为120°时MTF略有退化，但在RFA ≤ 90°时MTF显著退化。另一方面，通过设置启动回波，允许设置长ETL，大大提高了低RFA的MTF。单板法提供了一种清晰、简便的低RFA TSE分辨率特性评价方法。此外，该方法允许我们可视化k空间中每个回波的信号强度的变化，这取决于序列变化。这些结果表明，使用单板法的MTF测量是有用的评估的TSE序列的分辨率特性和优化的测量参数。
This study aimed to demonstrate the usefulness of modulation transfer function (MTF) measurements using the single-plate method to evaluate changes in resolution properties that are dependent on three parameters: echo train length (ETL), low refocusing flip angle (RFA), and start-up echo in three-dimensional T1-weighted turbo spin echoes (TSE) with a low RFA and to optimize these parameters. Although the MTFs were slightly degraded with an RFA of 120°, they were considerably degraded with an RFA of ≤ 90°. On the other hand, the MTF of low RFA was greatly improved by setting the start-up echo, allowing setting a long ETL. The single-plate method provided a clear and easy evaluation of the resolution properties of low RFA TSE. Furthermore, this method allows us to visualize changes in the signal intensity of each echo in k-space, depending on the sequence variation. These results suggest that the MTF measurement using the single-plate method is useful for evaluating the resolution properties of TSE sequences and optimizing the measured parameters.