| 基于圆形网格化的磁共振PROPELLER旋转校正算法 |
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| 引用本文： | 刘正彬,谭裴,周荷琴. 基于圆形网格化的磁共振PROPELLER旋转校正算法[J]. 北京生物医学工程, 2009, 28(5): 477-480. DOI: 10.3969/j.issn.1002-3208.2009.05.07 |
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| 作者姓名： | 刘正彬 谭裴 周荷琴 |
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| 作者单位： | 中国科学技术大学自动化系,合肥,230027 |
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| 摘 要： | PROPELLER数据采集成像技术利用K空间中心重叠采样区域的数据来估计受检查者的运动并加以校正，能较好地消除运动伪影。本文提出了一种基于圆形网格化的PROPELLER旋转校正算法，将中心重叠区域数据网格化到圆形的网格点上，避免了旋转估计时需多次网格化的缺点；并提出有效的相似性测度公式，通过计算测度值估计相应的旋转运动参数，据此对各数据带进行旋转校正。实验表明，与传统旋转校正算法相比，该算法运行速度快，成像质量好。
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| 关 键 词： | 磁共振成像 PROPELLER成像算法 旋转校正 圆形网格化 相似性测度公式 |
A Circular Gridding-Based Algorithm for Rotation Correction in the MRI Reconstruction of PROPELLER |
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| LIU Zhengbin,TAN Pei,ZHOU Heqin. A Circular Gridding-Based Algorithm for Rotation Correction in the MRI Reconstruction of PROPELLER[J]. Beijing Biomedical Engineering, 2009, 28(5): 477-480. DOI: 10.3969/j.issn.1002-3208.2009.05.07 |
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| Authors: | LIU Zhengbin TAN Pei ZHOU Heqin |
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| Affiliation: | (Department of Automation, University of Science and Technology of China, Hefei 230027) |
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| Abstract: | PROPELLER data acquisition imaging technique can extract inter-strip motion information from data in central overlapped sampling area, and suppress the artifacts caused by patients＇ rigid motion effectively. This study proposed a cireular-gridding algorithm for rotation correction. It calculated data in central overlapped area onto circular grid points, and thus avoided much gridding computation. Besides, it proposed a new efficient similarity measure formula to calculate the value of measure, estimated the rotation parameters and corrected data strips. Experimental results demonstrated the proposed method was running faster than the conventional algorithm, and improved image quality. |
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| Keywords: | magnetic resonance imaging PROPELLER method rotation correction circular gridding similarity measure formula |
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