Single-point Dixon water-fat imaging using 64-channel single-echo acquisition MRI.

Single-point Dixon water-fat imaging using 64-channel single-echo acquisition MRI.
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使用 64 通道单回波采集 MRI 的单点 Dixon 水脂成像。

DOI:
10.1002/cmr.b.20120
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发表时间:
2008
期刊:
Concepts in magnetic resonance. Part B, Magnetic resonance engineering
影响因子:
--
通讯作者:
Ji,JimX
Ji,JimX
中科院分区:
--
文献类型:
--
作者:
Son,JongBum;Wright,StevenM;Ji,JimX

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本文介绍了一种使用64个局部线圈元件阵列和单点狄克逊序列的单回波采集(SEA)进行高速水脂肪成像的方法。该方法从单个回波数据形成二维分离的水和脂肪图像。具体而言,开发了通道相关和区域生长算法,以从单个回波数据中提取相位信息,从而消除了水/脂肪分离通常所需的多个数据采集的需要。在4.7 T扫描仪上的体模研究表明,该方法可以处理较大的通道间和跨通道相位变化,即使在相对较高的数据噪声水平下。假设水和脂肪在空间上是分离的,并且它们可以通过由化学频移引起的相位不连续来识别,新方法可以在不降低SEA成像方法的高帧速率的情况下获得分离的水和脂肪图像。虽然它的能力是有限的,如果有大的磁化率伪影,断开的组织,或混合脂肪和水信号的像素,新的方法是潜在的有用的小动物的动态成像,其中SEA成像可以提供高成像速度,但可能会遭受降低对比度由于在短的重复时间内的强脂肪信号。© 2008 Wiley Periodicals,Inc.概念Magn Reson部分B(Magn Reson工程)33 B:152-162,2008
This article presents a method for high‐speed water‐fat imaging using Single‐Echo Acquisition (SEA) with an array of 64 localized coil elements and single‐point Dixon sequence. The method forms two‐dimensional separate water and fat images from a single echo data. Specifically, a channel correlation and region‐growing algorithm were developed to extract the phase information from the single echo data, eliminating the need for multiple data acquisition normally required for water/fat separation. Phantom studies on a 4.7 T scanner show that the method can handle large interchannel and cross‐channel phase variations, even at relative high data noise levels. Assume that the water and fat are spatially separated and they can be identified by the phase discontinuity caused by the chemical frequency shift, the new method can acquire separate water and fat images without reducing the high frame rates of the SEA imaging method. Although its capability is limited if there are large susceptibility artifacts, disconnected tissues, or pixels with mixed fat and water signals, the new method is potentially useful for dynamic imaging of small animals, where the SEA imaging can provide high imaging speed but may suffer from reduced contrast due to the strong fat signals at short repetition time. © 2008 Wiley Periodicals, Inc. Concepts Magn Reson Part B (Magn Reson Engineering) 33B: 152–162, 2008
球后空间的快速三点 Dixon MR 成像,具有用于相位校正的低分辨率图像:与快速自旋回波反转恢复成像的比较。
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