Undersampling patterns in k-space for compressed sensing MRI using two-dimensional Cartesian sampling

被引：12

作者：

Kojima S. ^{[1
]}

Shinohara H. ^{[2
]}

Hashimoto T. ^{[3
]}

Suzuki S. ^{[1
]}

机构：

[1] Department of Radiology, Tokyo Women’s Medical University Medical Center East, 2-1-10 Arakawa-ku, Tokyo

[2] Tokyo Metropolitan University, 7-2-10 Arakawa-ku, Tokyo

[3] Department of Medical Radiological Technology, Faculty of Health Sciences, Kyorin University, 5-4-1 Shimorenjaku, Mitaka-shi, Tokyo

来源：

Radiological Physics and Technology | 2018年 / 11卷 / 3期

关键词：

2D Cartesian sampling; Brain; Compressed sensing MRI; Image reconstruction; k-Space; Undersampling pattern;

D O I：

10.1007/s12194-018-0469-y

中图分类号：

学科分类号：

摘要：

In compressed sensing magnetic resonance imaging (CS-MRI), undersampling of k-space is performed to achieve faster imaging. For this process, it is important to acquire data randomly, and an optimal random undersampling pattern is required. However, random undersampling is difficult in two-dimensional (2D) Cartesian sampling. In this study, the effect of random undersampling patterns on image reconstruction was clarified using phantom and in vivo MRI, and a sampling pattern relevant for 2D Cartesian sampling in CS-MRI is suggested. The precision of image restoration was estimated with various acceleration factors and extents for the fully sampled central region of k-space. The root-mean-square error, structural similarity index, and modulation transfer function were measured, and visual assessments were also performed. The undersampling pattern was shown to influence the precision of image restoration, and an optimal undersampling pattern should be used to improve image quality; therefore, we suggest that the ideal undersampling pattern in CS-MRI for 2D Cartesian sampling is one with a high extent for the fully sampled central region of k-space. © 2018, Japanese Society of Radiological Technology and Japan Society of Medical Physics.

引用

页码：303 / 319

页数：16

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