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
复制标题
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
中科院分区:
文献类型:
--
作者:
Busch MG;Finsterbusch J
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.
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影响因子:
3.3
作者:
Mills,P;Chew,W;Litt,L;Moseley,M
通讯作者:
Moseley,M
影响因子:
3.3
作者:
Finsterbusch J;Busch MG
通讯作者:
Busch MG
影响因子:
3.3
作者:
DREHER, W;LEIBFRITZ, D
通讯作者:
LEIBFRITZ, D
DOI:
--
发表时间:
--
期刊:
影响因子:
--
作者:
通讯作者:
--
影响因子:
2.2
作者:
Florence Delmas;F. Delmas;J. Beloeil;B. Sanden;Klaas Nicolay;B. Gillet
通讯作者:
B. Gillet