All imaging data were acquired on a Siemens 3T Trio scanner with Echospeed gradients and a Siemens 32-channel whole head coil located at the UC Davis Imaging Research Center. Visual stimuli were projected onto a screen and viewed on an MR compatible mirror mounted above the participant's head. For each participant, an anatomical scan was acquired using a high resolution T1-weighted MPRAGE sequence (TR = 2500 ms, TE = 4.33 ms, flip angle = 7°, FOV = 243 mm × 243 mm, 208 slices, 0.95 mm slice thickness). After the anatomical scan, two functional runs were acquired for each participant. For the functional runs, imaging was performed using a T2*-weighted gradient echo planar pulse sequence (TR = 2000 ms, TE = 25 ms, flip angle = 90°). Each brain volume was composed of 36 axial slices (FOV = 220 × 220, matrix = 64 × 64, 3.4 mm × 3.4 mm × 3.4 mm resolution) aligned to the AC–PC line, collected interleaved, inferior to superior. For all functional runs, data from the first two volumes were discarded to allow for stabilization of magnetic fields.
32 channel whole head coil
Manufactured by Siemens
The 32-channel whole-head coil is a critical component of Siemens' MRI systems. It is designed to provide high-quality imaging of the entire human head, enabling detailed analysis and diagnostics. The coil's 32 individual channels allow for efficient signal acquisition and enhanced image resolution, supporting a wide range of clinical applications.
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4 protocols using 32 channel whole head coil
1
Siemens 3T fMRI Acquisition Protocol
2
Functional MRI Acquisition and Preprocessing
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The MRI image was acquired with a Siemens MAGNETOM Skyra® 3T scanner (located in National Cheng-Chi University, Taipei, Taiwan) and a Siemens 32-channel whole-head coil. Participants’ heads were immobilized with a vacuum-beam pad in the scanner. A T2*-weighted gradient-echo echo planar imaging (EPI) sequence was used for FMRI scans, with slice thickness of 3.4 mm, no inter-slice gap, in-plane resolution of 3.4375 × 3.4375 mm, and TR/TE/flip angle = 2000 ms/40 ms/77o. The field-of-view was 220 × 220 mm, and the acquisition matrix is 64 × 64. Thirty-three oblique-axial slices were acquired to cover the whole brain. In all FMRI experiments, the first five volumes of each scanning run were discarded for signal equilibrium.
To obtain fine localization of the activities in FMRI experimental sessions, a high-resolution anatomical image of each participant’s whole brain using a T1-weighted, MPRAGE sequence (TR = 3500 ms/TE = 3.5 ms/flip angle = 90o) was obtained. The in-plane resolution of this image was 1 × 1 mm, and the slice thickness was 1 mm. The sequence took 192 slices along the axial planes of the brain, which took approximately 5 minutes to acquire.
To obtain fine localization of the activities in FMRI experimental sessions, a high-resolution anatomical image of each participant’s whole brain using a T1-weighted, MPRAGE sequence (TR = 3500 ms/TE = 3.5 ms/flip angle = 90o) was obtained. The in-plane resolution of this image was 1 × 1 mm, and the slice thickness was 1 mm. The sequence took 192 slices along the axial planes of the brain, which took approximately 5 minutes to acquire.
3
3T fMRI Spatial Memory Protocol
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Scanning was performed using a 3T Siemens Tim trio MRI system with a 32‐channel whole‐head coil. Functional images were acquired using a gradient echo EPI sequence [field of view (FOV) =180 mm, image matrix = 72 × 72, repetition time (TR) = 2.8 s, time to echo (TE) = 33 ms, 36 interleaved slices parallel to the hippocampal axis, 2.5 × 2.5 × 2.5 mm3 resolution], and T1‐weighted in‐plane images in identical slice prescriptions (FOV = 180 mm, image matrix =192 × 192, TR = 1.2 s, TE = 2.85 ms, 0.9 × 0.9 × 2.5 mm3 resolution) were acquired for image registration. Once the session was completed, high‐resolution T1‐weighted structural images (MPRAGE, FOV = 256 mm, image matrix =256 × 256, TR = 1.9 s, TE = 2.36 ms, 1 × 1 × 1 mm3 resolution) were acquired. The VR stimuli were projected onto a screen using an LCD projector (Canon XEED SX60), and the subjects viewed the screen through mirrors on goggles. All responses were collected using an MRI‐compatible button box with four buttons. To ensure the safety of MRI data storage, each run typically ended after the 9th trial, depending on the response time for the spatial memory period. For each subject, twelve runs ranging from 12 to 14 runs were acquired on average.
4
High-Resolution 3T MRI Brain Imaging
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Scanning was performed on a 3-T Siemens Allegra MRI system at the Lewis Center for Neuroimaging at the University of Oregon using a 32-channel whole-head coil. High-resolution (0.5 × 0.5 × 1 mm) T1-weighted image was collected for anatomical visualization and normalization. Functional data were acquired using a gradient-echo, echo-planar pulse sequence (repetition time = 2000 ms, echo time = 30 ms, 31 interleaved slice acquisition, 3 × 3 × 3 mm voxel size). The first eight volumes of each session were discarded to allow for magnetic field stabilization.
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