Functional images were acquired on a General Electric MR750 3.0 T MR scanner at the Department of Neuroimaging, Institute of Psychiatry, Psychology and Neuroscience, King’s College London (London, UK). A 12-channel head coil was used for radio frequency transmission and reception. A single-shot gradient recalled echo planar imaging sequence was used for fMRI acquisition (64 × 64 matrix over a 21.1 × 21.1 cm2 field of view (FOV), giving an in-plane voxel size of 3.3 mm; slice thickness 3 mm with a 0.3 mm slice gap; repetition time (TR) = 2000ms; echo time (TE) = 30ms, flip angle = 75°). A high-resolution three-dimensional (3D) T1-weighted enhanced gradient echo (256 × 256 matrix over a 27 × 27 cm2 FOV, giving an in-plane voxel size of 1.05 mm; slice thickness 1.2 mm; TR = 7.312 ms, TE = 3.015 ms, flip angle = 11°) scan was acquired for image normalization. The first four volumes of each rtfMRI-NF run were discarded to allow steady-state magnetization to be established.
Mr750 3.0 t mr scanner
Manufactured by GE Healthcare
Sourced in United Kingdom
The MR750 3.0 T MR scanner is a magnetic resonance imaging (MRI) system developed by GE Healthcare. It is designed to operate at a magnetic field strength of 3.0 Tesla, which provides high-quality images for a wide range of clinical applications.
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3 protocols using mr750 3.0 t mr scanner
1
fMRI Data Acquisition on 3T MR Scanner
2
Functional Imaging of the Brain
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Functional images were acquired on a General Electric MR750 3.0 T MR scanner with a 12-channel head coil. A T2*-weighted gradient echo, echo-planar imaging sequence was used, which covered 41 axial slices and recorded 347 vol acquired sequentially, descending (TR/TE 2000/30 ms, flip angle 75°, 64 × 64 matrix, 3 mm thick, field of view (FoV) = 247 mm). To facilitate fMRI data registration and normalisation, we also acquired a T1-weighted Magnetization Prepared Rapid Gradient Echo MPRAGE image (TR/TE 7312/3.02 ms, flip angle 11°, 256 × 256 matrix, 1.2 mm thick, 196 sagittal slices, FoV = 270 mm).
3
Functional MRI of Brain Activity
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MRI was performed on a GE MR750 3.0T MR scanner and 32-channel head coil capable of performing functional and structural scans in humans. In two 7.5-minute blocks, functional T2*-weighted echo planar images with BOLD contrast were acquired parallel to the AC-PC plane in bottom-up interleaved order using the following settings: 24 slices per volume; slice thickness, 3 mm; field of view, 240 mm2, matrix, 96 × 96; spatial resolution, 2.5 × 2.5 × 3 mm3; echo time, 25 milliseconds; repetition time, 2000 milliseconds; and flip angle, 50degrees. The initial five nonequilibrium volumes of each functional run were discarded from further analyses. High-resolution T1-weighted anatomical images were also acquired for everyone using a magnetization-prepared rapid gradient echo sequence (thickness, 1 mm; field of view, 256 mm2; matrix, 256 × 256; repetition time, 9.2 milliseconds; echo time, = 3.7 milliseconds; flip angle, 12 degrees). Before analysis, MRI data were visually inspected for warping, head coverage, blurring, and signal artifacts (including ringing, striping, ghosting, or signal loss; see http://fcon_1000.projects.nitrc.org/indi/enhanced/qc.html ).
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