Filling the dead-time gap in zero echo time MRI: Principles compared
Filling the dead-time gap in zero echo time MRI: Principles compared
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DOI：
10.1002/mrm.26875
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发表时间：
2018-04-01
影响因子：
3.3
通讯作者：
Pruessmann, Klaas P.
中科院分区：
文献类型：
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作者：
Froidevaux, Romain;Weiger, Markus;Pruessmann, Klaas P.
目的利用零回波时间（zero echo time，ZTE）技术，如代数ZTE、径向采集逐点编码时间缩减（pointwise encoding time reduction with radial acquisition，PETRA）和水和脂肪抑制质子投影MRI（water-and-fat-suppressed proton projection MRI，WASPI），可以有效地对相干寿命T-2或T2* 较短的组织进行MRI成像。他们共同面临的主要挑战是恢复由于初始射频死区时间而丢失的中央k空间数据。本研究的目的是直接比较这三种技术，特别关注他们的行为中存在的超短寿命spins.MethodsThe最直接的比较，使对齐采集和重建策略的三种技术。使用点扩散函数、3D模拟以及短T2 *（
PurposeMRI of tissues with short coherence lifetimes T-2 or T2* can be performed efficiently using zero echo time (ZTE) techniques such as algebraic ZTE, pointwise encoding time reduction with radial acquisition (PETRA), and water- and fat-suppressed proton projection MRI (WASPI). They share the principal challenge of recovering data in central k-space missed due to an initial radiofrequency dead time. The purpose of this study was to compare the three techniques directly, with a particular focus on their behavior in the presence of ultra-short-lived spins.MethodsThe most direct comparison was enabled by aligning acquisition and reconstruction strategies of the three techniques. Image quality and short-T2* performance were investigated using point spread functions, 3D simulations, and imaging of phantom and bone samples with short (