Free-breathing abdominal MRI improved by repeated k-t-subsampling and artifact-minimization (ReKAM).

Free-breathing abdominal MRI improved by repeated k-t-subsampling and artifact-minimization (ReKAM).
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通过重复的K-T-subsmpling和伪影(REKAM)改善了自由呼吸的腹部MRI。

DOI:
10.1002/mp.12674
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发表时间:
2018-01
期刊:
影响因子:
3.8
通讯作者:
Chen NK
Chen NK
中科院分区:
医学3区
文献类型:
--
作者:
Chu ML;Chang HC;Chung HW;Bashir MR;Cai J;Zhang L;Sun D;Chen NK

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我们报告了一种称为重复 k-t 子采样和伪影最小化 (ReKAM) 的方法,用于消除自由呼吸腹部 MRI 中的运动伪影。该方法对于可能无法长时间屏住呼吸或呼吸频率不规则的挑战性患者特别有价值。 ReKAM框架包括1个采集模块和2个重建模块。使用快速 MRI 序列重复采集多组 k-t 空间数据。然后通过两个重建模块最小化运动伪影:1)k-t-空间中的引导模块用于识别低伪影图像; 2)应用集成了凸集投影(POCS)和复用灵敏度编码(MUSE)的约束重建模块(称为POCSMUSE)来进一步消除残留伪影。 ReKAM框架兼容不同的脉冲序列,通常适用于k空间中的不规则数据采样模式。从健康志愿者和患者处获得的自由呼吸快速自旋回波 MRI 数据用于评估所开发的 ReKAM 方法。实验结果表明,ReKAM 技术可以生成高质量的自由呼吸图像,其伪影水平与屏气 MRI 相当。 ReKAM框架提高了自由呼吸腹部MRI数据的质量,并且与各种MRI脉冲序列兼容。
We report an approach, termed Repeated k-t-subsampling and artifact-minimization (ReKAM), for removing motion artifacts in free-breathing abdominal MRI. The method is particularly valuable for challenging patients who may not hold their breath for a long time or have irregular respiratory rate. The ReKAM framework comprises one acquisition module and two reconstruction modules. A fast MRI sequence is used to repeatedly acquire multiple sets of k-t space data. Motion artifacts are then minimized by two reconstruction modules: 1) a bootstrapping module in k-t-space is used to identify a low-artifact image; 2) a constrained reconstruction module that integrates projection onto convex set (POCS) and multiplexed sensitivity encoding (MUSE), termed POCSMUSE, is applied to further remove residual artifact. The ReKAM framework is compatible with different pulse sequences, and generally applicable to irregular data sampling patterns in k-space. Free-breathing fast spin-echo MRI data, acquired from healthy volunteers and patients, were used to evaluate the developed ReKAM method. Experimental results show that the ReKAM technique can produce high-quality free-breathing images with the artifact levels comparable to that of breath-holding MRI. The ReKAM framework improves the quality of free-breathing abdominal MRI data, and is compatible with various MRI pulse sequences.
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