| 一种基于分段迭代的MRI成像涡流补偿方法 |
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| 引用本文： | 郭亚平,潘文宇,周荷琴. 一种基于分段迭代的MRI成像涡流补偿方法[J]. 生物医学工程研究, 2011, 30(2): 67-71 |
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| 作者姓名： | 郭亚平 潘文宇 周荷琴 |
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| 作者单位： | 中国科学技术大学自动化系,安徽合肥,230027 |
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| 摘 要： | 在核磁共振成像中,涡流的存在会影响系统的成像质量.梯度电流预增强方法是一种被广泛采用的有效的涡流补偿方法.梯度电流预增强在一个周期内要进行上千次e指数计算,需采用快速的计算方法.迭代计算是普遍采用的涡流补偿快速计算方法,但是存在累积误差放大的问题.针对这种问题,基于迭代计算原理,我们提出了一种改进的分段迭代的MRI成像...
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| 关 键 词： | 磁共振成像 梯度电流 涡流补偿 累积误差 分段迭代计算 |
Eddy Current Compensation in MRI based on Iterative Segmentation Calculation |
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| GUO Yaping,PAN Wenyu,ZHOU Heqin. Eddy Current Compensation in MRI based on Iterative Segmentation Calculation[J]. Journal Of Blomedical Englneerlng Research, 2011, 30(2): 67-71 |
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| Authors: | GUO Yaping PAN Wenyu ZHOU Heqin |
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| Affiliation: | GUO Yaping,PAN Wenyu,ZHOU Heqin (Department of Automation,University of Science and Technology of China,Hefei 230027,China) |
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| Abstract: | The eddy current will affect the imaging quality in magnetic resona nce imaging systems.The pre-emphasis of gradient current is an efficient method and is widely used in eddy current compensation.Pre-emphasis of gradient curre nt needs thousands of exponential calculation in a single cycle.So it is impera tive to use a rapid method.Iteration calculation is generally used in eddy curr ent compensation.However,accumulated error will be amplified with the number o f iterations.In order to solve the problem,bas... |
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| Keywords: | Magnetic resonance imaging Gradient current Eddy cu rrent compensation Accumulated error Iterative segmentation calculation |
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