TY - JOUR
T1 - Fast interleaved echo-planar imaging with navigator
T2 - High resolution anatomic and functional images at 4 tesla
AU - Kim, Seong Gi
AU - Hu, Xiaoping
AU - Adriany, Gregor
AU - Ugurbil, Kamil
PY - 1996/6
Y1 - 1996/6
N2 - Echo-planar imaging (EPI) is sensitive to magnetic field inhomogeneities, which lead to signal loss and geometric distortions of the image. Magnetic field inhomogeneities induced by susceptibility differences, as encountered in the human body, increase with the magnetic field strength, thus, complicating implementation of high resolution EPI techniques on high magnetic field systems. These problems were overcome by using a fast multishot high resolution EPI method that uses variable flip angles, center- out k-space sampling, and navigator echoes. This approach maximizes signal- to-noise ratio, reduces flow artifacts, and permits correction of intersegment amplitude and phase variations, providing high spatial and temporal resolution. This scheme can be implemented with a single magnetization preparation for contrast that precedes the segments. The utility of this ultrafast segmented EPI technique with navigator is demonstrated for anatomic and functional imaging studies on the human brain at 4 T.
AB - Echo-planar imaging (EPI) is sensitive to magnetic field inhomogeneities, which lead to signal loss and geometric distortions of the image. Magnetic field inhomogeneities induced by susceptibility differences, as encountered in the human body, increase with the magnetic field strength, thus, complicating implementation of high resolution EPI techniques on high magnetic field systems. These problems were overcome by using a fast multishot high resolution EPI method that uses variable flip angles, center- out k-space sampling, and navigator echoes. This approach maximizes signal- to-noise ratio, reduces flow artifacts, and permits correction of intersegment amplitude and phase variations, providing high spatial and temporal resolution. This scheme can be implemented with a single magnetization preparation for contrast that precedes the segments. The utility of this ultrafast segmented EPI technique with navigator is demonstrated for anatomic and functional imaging studies on the human brain at 4 T.
KW - Echo-planar imaging
KW - functional MRI
KW - high resolution imaging
KW - navigator
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U2 - 10.1002/mrm.1910350618
DO - 10.1002/mrm.1910350618
M3 - Article
C2 - 8744018
AN - SCOPUS:0029954899
SN - 0740-3194
VL - 35
SP - 895
EP - 902
JO - Magnetic resonance in medicine
JF - Magnetic resonance in medicine
IS - 6
ER -