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首页> 外文期刊>Computational Imaging, IEEE Transactions on >Mean Squared Error Based Excitation Pattern Design for Parallel Transmit and Receive SENSE MRI Image Reconstruction
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Mean Squared Error Based Excitation Pattern Design for Parallel Transmit and Receive SENSE MRI Image Reconstruction

机译：基于均方误差的并行发送和接收SENSE MRI图像重建的激励模式设计

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摘要

Parallel coils at both the transmitter and receiver can be used to offer more control over the magnetic resonance imaging (MRI) system, and this implementation has potential to improve the performance in high-field MRI. A new MSE-based EXcitation Pattern (MSE-EXP) design for image reconstruction in parallel transmit and receive SENSitivity Encoding (pTxRx SENSE) MRI is presented in this paper to maximize the performance of an MRI using an array of transmit and receive coils. In the the small-tip-angle regime, we derive theoretically effective excitation patterns for fully-sampled k-space data (with no SNR assumption) and for under-sampled k-space data under both low and high SNR assumptions. The proposed MSE-EXP-encoded pTxRx SENSE MRI has two main advantages for high-field MRI, one is the specific absorption rate (SAR) management through prespecification of the global SAR regulatory limit in the excitation pattern design weight constraint and an another is the imaging acceleration by effective reduction of aliasing artifacts, particularly for advanced image reconstruction in highly under-sampled pTxRx SENSE MRI in the high-SNR regime. Numerical experiments demonstrate that reconstruction accuracy in pTxRx SENSE MRI is significantly improved by the proposed MSE-EXP design, but our study also identifies several practical challenges associated with generation of the proposed MSE-EXP.
机译：发送器和接收器上的并联线圈可用于提供对磁共振成像（MRI）系统的更多控制，这种实现方式有可能改善高场MRI的性能。本文提出了一种新的基于MSE的激励模式（MSE-EXP）设计，用于并行发送和接收灵敏度编码（pTxRx SENSE）MRI中的图像重建，以利用发送和接收线圈阵列最大化MRI的性能。在小尖角状态下，我们导出了在低和高SNR假设下对全采样k空间数据（无SNR假设）和欠采样k空间数据的理论上有效的激励模式。拟议的MSE-EXP编码的pTxRx SENSE MRI对于高场MRI具有两个主要优点，一个是通过在激励模式设计权重约束中预先指定全局SAR调节极限来管理比吸收率（SAR），另一个是通过有效减少混叠伪影来实现成像加速，特别是在高SNR情况下高度欠采样的pTxRx SENSE MRI中进行高级图像重建时。数值实验表明，提出的MSE-EXP设计可显着提高pTxRx SENSE MRI的重建精度，但我们的研究还发现了与提出的MSE-EXP产生相关的一些实际挑战。

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