Hadamard‐encoding combined with two‐dimensional‐selective radiofrequency excitations for flexible and efficient acquisitions of multiple voxels in MR spectroscopy

Hadamard‐encoding combined with two‐dimensional‐selective radiofrequency excitations for flexible and efficient acquisitions of multiple voxels in MR spectroscopy
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Hadamard 编码与二维选择性射频激励相结合,可灵活高效地采集 MR 波谱中的多个体素

DOI:
10.1002/jmri.23521
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发表时间:
2012
影响因子:
4.4
通讯作者:
Finsterbusch J
Finsterbusch J
中科院分区:
医学2区
文献类型:
--
作者:
Busch MG;Finsterbusch J

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目的通过将二维选择性射频(2DRF)激励与Hadamard编码相结合,提高磁共振波谱多体素采集的效率和灵活性。材料与方法采用2DRF激励(螺旋桨轨迹,16个半傅立叶段,每段5行)定义两个体素。通过将单独的2DRF脉冲与类Hadamard编码的相位组合,可以同时获取体素,但可以从获得的光谱中分离出单独的贡献。这一点在3Tesla全身磁共振系统的模体上和活体的人脑中得到了验证。结果与连续的单体素采集相比,信号效率随着覆盖的体素数量的增加而提高。此外,与传统的基于横截面射频激励的单体素MRS相比,2DRF激发具有更高的灵活性,因为它们允许任意的体素大小、方向、平面位置和形状。结论该方法提高了多体素采集的灵活性和效率,即可以相应地缩短采集时间,并有助于减少局部体积效应。J·马根。雷森。《成像》2012;35:976-983。©2011 Wiley期刊,Inc.
PurposeTo improve the efficiency and flexibility of acquisitions of multiple voxels in MR spectroscopy by combining two‐dimensional‐selective radiofrequency (2DRF) excitations and Hadamard encoding.Materials and MethodsWith 2DRF excitations (PROPELLER trajectory, 16 half‐Fourier segments, each with five lines) two voxels are defined. By combining the individual 2DRF pulses with Hadamard‐like encoded phases, the voxels are acquired simultaneously but the individual contributions can be isolated from the obtained spectra. This is demonstrated on a 3 Tesla whole‐body MR system in phantoms and in the human brain in vivo.ResultsCompared with sequential single‐voxel acquisitions the signal efficiency increases with the number of voxels covered. Furthermore, in comparison to conventional single‐voxel MRS based on cross‐sectional RF excitations, 2DRF excitations offer a higher flexibility because they allow for arbitrary voxel sizes, orientations, in‐plane positions, and shapes.ConclusionThe presented approach improves the flexibility and efficiency of acquisitions of multiple voxels, i.e., can shorten acquisition times accordingly, and can help to reduce partial volume effects. J. Magn. Reson. Imaging 2012;35:976–983. © 2011 Wiley Periodicals, Inc.
使用受激回波进行局部成像。
DOI: 10.1002/mrm.1910050412
发表时间: 1987
影响因子: 3.3
作者:
Mills,P;Chew,W;Litt,L;Moseley,M
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分段 2D 选择性 RF 激励,具有加权平均和翻转角自适应,适用于不规则形状体素的 MR 波谱
DOI: 10.1002/mrm.22806
发表时间: 2011
影响因子: 3.3
作者:
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通讯作者: Busch MG
DOI: 10.1002/mrm.1910310604
发表时间: 1994-06-01
影响因子: 3.3
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Ohshiro T:“尿激酶处理材料的临床应用。酶学方法,学术出版社”学术出版社,16(1988)
DOI: --
发表时间: --
期刊:
影响因子: --
作者:
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DOI: 10.1006/jmre.2000.2280
发表时间: 2001
影响因子: 2.2
作者:
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通讯作者: B. Gillet