Single-shot magnetic resonance spectroscopic imaging with partial parallel imaging.
Single-shot magnetic resonance spectroscopic imaging with partial parallel imaging.
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DOI：
10.1002/mrm.21855
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发表时间：
2009-03
影响因子：
3.3
通讯作者：
Lin, Fa-Hsuan
中科院分区：
文献类型：
--
作者：
Posse, Stefan;Otazo, Ricardo;Tsai, Shang-Yueh;Yoshimoto, Akio Ernesto;Lin, Fa-Hsuan
关键词：
An MR spectroscopic imaging (MRSI) pulse sequence based on Proton-Echo-Planar-Spectroscopic-Imaging (PEPSI) is introduced that measures 2-dimensional metabolite maps in a single excitation. Echo-planar spatial-spectral encoding was combined with interleaved phase encoding and parallel imaging using SENSE to reconstruct absorption mode spectra. The symmetrical k-space trajectory compensates phase errors due to convolution of spatial and spectral encoding. Single-shot MRSI at short TE was evaluated in phantoms and in vivo on a 3 T whole body scanner equipped with 12-channel array coil. Four-step interleaved phase encoding and 4-fold SENSE acceleration were used to encode a 16×16 spatial matrix with 390 Hz spectral width. Comparison with conventional PEPSI and PEPSI with 4-fold SENSE acceleration demonstrated comparable sensitivity per unit time when taking into account g-factor related noise increases and differences in sampling efficiency. LCModel fitting enabled quantification of Inositol, Choline, Creatine and NAA in vivo with concentration values in the ranges measured with conventional PEPSI and SENSE-accelerated PEPSI. Cramer-Rao lower bounds were comparable to those obtained with conventional SENSE-accelerated PEPSI at the same voxel size and measurement time. This single-shot MRSI method is therefore suitable for applications that require high temporal resolution to monitor temporal dynamics or to reduce sensitivity to tissue movement.
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影响因子：
3.3
作者：
ADALSTEINSSON, E;IRARRAZABAL, P;MACOVSKI, A
通讯作者：
MACOVSKI, A
影响因子：
2.5
作者：
Hu, JN;Vartanian, SA;Soulen, RL
通讯作者：
Soulen, RL
影响因子：
2.2
作者：
Metzger, G;Hu, XP
通讯作者：
Hu, XP
影响因子：
3.3
作者：
DUYN, JH;MOONEN, CTW
通讯作者：
MOONEN, CTW
影响因子：
3.3
作者：
Dydak, U;Pruessmann, KP;Boesiger, P
通讯作者：
Boesiger, P