Gradient and stimulated echo (GRASTE) imaging.
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Gradient and stimulated echo (GRASTE) imaging. / Finsterbusch, Jürgen; Frahm, Jens; Koch, Martin A.
In: MAGN RESON MED, Vol. 55, No. 2, 2, 2006, p. 455-459.Research output: SCORING: Contribution to journal › SCORING: Journal article › Research › peer-review
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TY - JOUR
T1 - Gradient and stimulated echo (GRASTE) imaging.
AU - Finsterbusch, Jürgen
AU - Frahm, Jens
AU - Koch, Martin A
PY - 2006
Y1 - 2006
N2 - As a modification of single-shot stimulated echo acquisition mode (STEAM) MRI, a gradient and stimulated echo (GRASTE) sequence is presented that acquires multiple gradient echoes in addition to each stimulated echo. While "contiguous" GRASTE exploits all stimulated echoes for the central part of k-space and the gradient echoes for outer lines, "interleaved" GRASTE assigns all echoes of a particular readout interval to directly neighboring lines. Phase distortions may be corrected by the reference signals of a single readout interval without phase encoding. Experimental results obtained for the human brain demonstrate that contiguous GRASTE yields up to 30% better SNR per acquisition time than conventional single-shot STEAM due to a better efficiency and maintains most of its robustness. Interleaved GRASTE can improve the SNR by a factor of 2 because of the possibility of using larger flip angles in the readout interval. However, its more pronounced sensitivity to off-resonance effects requires short echo trains.
AB - As a modification of single-shot stimulated echo acquisition mode (STEAM) MRI, a gradient and stimulated echo (GRASTE) sequence is presented that acquires multiple gradient echoes in addition to each stimulated echo. While "contiguous" GRASTE exploits all stimulated echoes for the central part of k-space and the gradient echoes for outer lines, "interleaved" GRASTE assigns all echoes of a particular readout interval to directly neighboring lines. Phase distortions may be corrected by the reference signals of a single readout interval without phase encoding. Experimental results obtained for the human brain demonstrate that contiguous GRASTE yields up to 30% better SNR per acquisition time than conventional single-shot STEAM due to a better efficiency and maintains most of its robustness. Interleaved GRASTE can improve the SNR by a factor of 2 because of the possibility of using larger flip angles in the readout interval. However, its more pronounced sensitivity to off-resonance effects requires short echo trains.
M3 - SCORING: Zeitschriftenaufsatz
VL - 55
SP - 455
EP - 459
JO - MAGN RESON MED
JF - MAGN RESON MED
SN - 0740-3194
IS - 2
M1 - 2
ER -
