Pseudo-random center placement O-space imaging for improved incoherence compressed sensing parallel MRI.
Pseudo-random center placement O-space imaging for improved incoherence compressed sensing parallel MRI.
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DOI：
10.1002/mrm.25364
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发表时间：
2015-06
影响因子：
3.3
通讯作者：
Constable, R. Todd
中科院分区：
文献类型：
--
作者：
Tam, Leo K.;Galiana, Gigi;Stockmann, Jason P.;Tagare, Hemant;Peters, Dana C.;Constable, R. Todd
关键词：
非线性空间编码磁（SEM）场策略，如o空间成像，先前报道了加速扫描期间分散的伪影。压缩感知（CS）显示了一个提高稀疏性的凸程序，当使用适当的采样时，它允许从减少的数据集重建图像。伪随机中心放置（CP） o空间CS方法的发展通过SEM场调制来优化非相干性，以减少误差重建图像。非相干参数决定了CS有效的稀疏度水平，相关的变换点扩展函数测量了单个点的最大干扰。通过在标称值的30%内扰动Z2强度，o空间采集对CS进行了优化，并在人体3T扫描仪上进行了验证。伪随机CP 0空间成像可以改善感知域和稀疏域之间的不相干性。图像表明，与典型的线性扫描电镜场采集方法相比，伪随机CP 0空间减小了均方误差。伪随机CP o空间成像，与设计用于CS的非线性SEM场相比，在使用八通道周向接收机阵列进行并行成像时，可以降低高加速度下二维切片图像的均方误差。
Nonlinear spatial encoding magnetic (SEM) field strategies such as O-space imaging have previously reported dispersed artifacts during accelerated scans. Compressed sensing (CS) has shown a sparsity-promoting convex program allows image reconstruction from a reduced data set when using the appropriate sampling. The development of a pseudo-random center placement (CP) O-space CS approach optimizes incoherence through SEM field modulation to reconstruct an image with reduced error. The incoherence parameter determines the sparsity levels for which CS is valid and the related transform point spread function measures the maximum interference for a single point. The O-space acquisition is optimized for CS by perturbing the Z2 strength within 30% of the nominal value and demonstrated on a human 3T scanner. Pseudo-random CP O-space imaging is shown to improve incoherence between the sensing and sparse domains. Images indicate pseudo-random CP O-space has reduced mean squared error compared with a typical linear SEM field acquisition method. Pseudo-random CP O-space imaging, with a nonlinear SEM field designed for CS, is shown to reduce mean squared error of images at high acceleration over linear encoding methods for a 2D slice when using an eight channel circumferential receiver array for parallel imaging.
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影响因子：
3.8
作者：
KWIAT, D;EINAV, S;NAVON, G
通讯作者：
NAVON, G
影响因子：
3.3
作者：
Knoll F;Schultz G;Bredies K;Gallichan D;Zaitsev M;Hennig J;Stollberger R
通讯作者：
Stollberger R
影响因子：
3.3
作者：
Blamire, AM;Rothman, DL;Nixon, T
通讯作者：
Nixon, T
影响因子：
3.3
作者：
Lin, Fa-Hsuan
通讯作者：
Lin, Fa-Hsuan
DOI：
10.1002/cmr.a.21243
发表时间：
2012-09
期刊：
Concepts in magnetic resonance. Part A, Bridging education and research
影响因子：
--
作者：
Galiana G;Stockmann JP;Tam L;Peters D;Tagare H;Constable RT
通讯作者：
Constable RT