Self-calibrated spiral SENSE
Self-calibrated spiral SENSE
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DOI：
10.1002/mrm.20197
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发表时间：
2004-09-01
影响因子：
3.3
通讯作者：
Wang, Y
中科院分区：
文献类型：
--
作者：
Qian, YX;Zhang, ZH;Wang, Y
当前标准的灵敏度编码并行成像(SENSE)利用完全采样的低分辨率参考扫描来估计线圈的灵敏度。该参考扫描增加了扫描时间，并且可能引入错误配准伪影。这项研究的目的是研究直接从欠采样k空间中心估计螺旋感测线圈灵敏度的可行性。线圈灵敏度的有限空间频率，以及奈奎斯特半径以外的欠采样会导致图像伪影。点扩展函数(PSF)分析和在幻影和人体上的实验通过最小化这些图像伪影确定了k空间中心的最佳半径。初步数据表明，自校准感测与使用全采样参考扫描的标准感测一样准确。(C)2004年Wiley-Liss公司
Current standard sensitivity-encoded parallel imaging (SENSE) utilizes a fully sampled low-resolution reference scan to estimate the coil sensitivities. This reference scan adds scan time and may introduce misregistration artifacts. The purpose of this study was to investigate the feasibility of estimating the coil sensitivities for spiral SENSE directly from an undersampled k-space center. The limited spatial frequencies of the coil sensitivities, and the undersampling beyond the Nyquist radius cause image artifacts. A point spread function (PSF) analysis and experiments on both phantoms and humans identified an optimal radius for the k-space center by minimizing these image artifacts. The preliminary data indicate that self-calibrated SENSE is as accurate as standard SENSE, which uses a fully sampled reference scan. (C) 2004 Wiley-Liss, Inc.