Participants underwent a T1-weighted structural scan followed by a resting-state fMRI scan in a Magnetom Prisma 3T scanner (Siemens, Germany) equipped with a 64-channel head coil. T1-weighted images were acquired in the axial plane using a 3D magnetization-prepared rapid gradient-echo sequence with the following parameters: TR = 2530 ms; TE = 2.88 ms; TI = 1100 ms; flip angle = 7°; matrix size = 224 ×224; voxel size = 1 ×1×1 mm3; iPAT = 2. The resting-state scan was carried out using a 2D BOLD echo planar sequence in an axial plane with the following parameters: TR = 2000 ms; TE = 30 ms; flip angle = 75°; matrix size = 64×64; voxel size = 3.5×3.5×3.5 mm3 and full brain coverage by acquiring 37 interleaved slices (no gaps); iPAT = 2 with fat suppression. For each participant, this sequence generated 200 volumes in a total of 6:40 min. During the resting-state scan, participants were asked to relax, maintain their eyes closed, not to think of anything in particular and to stay awake.
Magnetom prisma 3
Manufactured by Siemens
Sourced in Germany
The Magnetom Prisma 3 is a magnetic resonance imaging (MRI) system manufactured by Siemens. It is a high-field MRI scanner that operates at a magnetic field strength of 3 Tesla. The Magnetom Prisma 3 is designed to provide high-quality imaging for a variety of clinical applications.
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8 protocols using magnetom prisma 3
1
Multimodal Neuroimaging Protocol for Resting-State Analysis
2
Structural MRI Brain Reconstruction
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Following the MEG recordings, we obtained structural MRI images from all but one participant, who was feeling unwell in the MRI scanner. We used a Siemens Magnetom Prisma 3 T whole-body MRI scanner (Siemens, Erlangen, Germany) with a T1-weighted 3-D sequence (MPRAGE, TR = 2000 ms, TE = 2.07 ms) with a slice thickness of 0.75 mm. Individual brain surfaces were reconstructed from the T1 images using freesurfer [32 (link)].
3
Amygdalar Functional Connectivity and Endocannabinoid System
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Anatomical and functional blood oxygen-level-dependent (BOLD) data were collected on a Siemens MAGNETOM Prisma 3T MRI scanner (Siemens healthcare AB, Stockholm, Sweden) equipped with a 64-channel head coil. EPI images were de-spiked, slice-time corrected, smoothed (4 mm) and motion-corrected. Preprocessing and statistical analysis of resting state data were performed with the Analysis of Functional Neuro Images (AFNI) software v18.3.16 33 (link).
For each participant (N = 88), amygdala time course was entered as predictor in a regression analysis on preprocessed data, using 3dDeconvolve. Resulting 3D volumes with beta coefficients for right/left amygdala were assessed for covariance with peripheral measures of endocannabinoid function and behavioral measures of fear conditioning using the AFNI function 3dttest++ and with 2AG (N = 82) and CS generalization (CS− vs CS+) at early Extinction (N = 88) as covariates in two separate analyses. Activation maps were thresholded at per-voxel p < 0.002, cluster corrected at α = 0.05 34 (link). To validate the results, beta coefficients from the significant cluster were then extracted for each participant and entered in regression analyses with the corresponding covariate as predictor. Regression analyses were performed using SPSS version 25.
For each participant (N = 88), amygdala time course was entered as predictor in a regression analysis on preprocessed data, using 3dDeconvolve. Resulting 3D volumes with beta coefficients for right/left amygdala were assessed for covariance with peripheral measures of endocannabinoid function and behavioral measures of fear conditioning using the AFNI function 3dttest++ and with 2AG (N = 82) and CS generalization (CS− vs CS+) at early Extinction (N = 88) as covariates in two separate analyses. Activation maps were thresholded at per-voxel p < 0.002, cluster corrected at α = 0.05 34 (link). To validate the results, beta coefficients from the significant cluster were then extracted for each participant and entered in regression analyses with the corresponding covariate as predictor. Regression analyses were performed using SPSS version 25.
4
Whole-Brain MRI Imaging Protocol for Brain Research
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Whole-brain MRI data were acquired at the Center for Brain Imaging Science and Technology, First Affiliated Hospital of Zhejiang University School on a Siemens MAGNETOM Prisma 3T scanner (Siemens, Erlangen, Germany). All participants were placed in the machine with foam padding around the head to reduce motion; they were asked to keep still with their eyes closed during imaging.
An echo-planar imaging sequence was used to acquire the functional images with the following: 60 axial slices, thickness/gap = 2.0/0mm, in-plane resolution = 64 × 64, repetition time (TR) = 2,000 ms, echo time (TE) = 34 ms, flip angle = 62° and field of view (FOV) = 220 mm × 220 mm. Anatomical T1-weighted whole brain magnetization-prepared rapid gradient echo images were obtained using the following: 160 sagittal slices, slice thickness/gap = 1.2/0 mm, in-plane resolution = 512 × 512, TR = 5,000 ms, TE = 2.9 ms, inversion time (TI) = 700 ms, flip angle = 4° and FOV = 256 mm × 256 mm.
An echo-planar imaging sequence was used to acquire the functional images with the following: 60 axial slices, thickness/gap = 2.0/0mm, in-plane resolution = 64 × 64, repetition time (TR) = 2,000 ms, echo time (TE) = 34 ms, flip angle = 62° and field of view (FOV) = 220 mm × 220 mm. Anatomical T1-weighted whole brain magnetization-prepared rapid gradient echo images were obtained using the following: 160 sagittal slices, slice thickness/gap = 1.2/0 mm, in-plane resolution = 512 × 512, TR = 5,000 ms, TE = 2.9 ms, inversion time (TI) = 700 ms, flip angle = 4° and FOV = 256 mm × 256 mm.
5
Resting-State Brain Imaging Protocol
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All participants underwent the acquisition of functional and structural images of the brain in the resting state with a Siemens Magnetom Prisma 3T MRI scanner (Siemens, Erlangen, Germany), using a 64-channel head coil. The participants were instructed to close their eyes but remain awake during the functional scans. The three-dimensional (3D)-T1-weighted (T1W) structural image parameters were as follows: TR/TE = 2,530/2.98 ms, flip angle = 8°, slice thickness = 1 mm, no gap, matrix = 512 × 512, and field of view = 256 × 256 mm. A whole brain scan was performed parallel to the midsagittal plane with 192 scanned slices. Resting-state BOLD fMRI data were acquired using a gradient echo planar pulse sequence with Simultaneous Multi-slice parallel acquisition from Siemens Prisma to achieve high temporal resolution with TR = 500 ms, TE = 30 ms, slice thickness = 3.5 mm, no gap, field of view = 224 × 224 mm, matrix = 64 × 64, flip angle = 60°, 35 axial slices, acquisition time points of 960, and acquisition time of 8 min and 45 s.
6
MRI Imaging of Neck/Shoulder Fat Fraction
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One day after 18F-FDG-PET/CT, we performed magnetic resonance imaging (MRI) on a Magnetom Prisma 3 T scanner (Siemens Healthineers, Erlangen, Germany). Image acquisition lasted 6:26 min. Study participants wore shorts and t-shirt and were covered with a blanket. Images were acquired of the neck/shoulder area using a 3D volumetric, interpolated multi-echo spoiled gradient-echo (VIBE) sequence with monopolar readout, a repetition time of 13.50 ms, flip angle of 6°, 6-echos [1.09 ms, 3.19 ms, 5.29 ms, 7.39 ms, 9.49 ms, 11.59 ms] and a bandwidth of 810 Hz/Px for each. The image resolution parameters were as follows: Field of view: 256 mm (read) x 384 mm (phase); imaging matrix: 192 × 288 × 72; voxel size (mm): 1.3 × 1.3 x 1.3. Fat fraction was calculated with the vendors built in evaluation software using the mDixon-separation method.
7
Whole-Brain Structural MRI Acquisition Protocol
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All whole-brain T1- and T2-weighted MRI scans were collected on a Siemens Magnetom Prisma 3 Tesla MRI scanner using a 32-channel head coil at the University of Southern California’s Center for Image Acquisition. The 3D T1 and T2 weighted structural images were acquired using sagittal whole-brain MPRAGE sequences (T1: TR = 2,400 ms, TE = 2.22 ms, flip angle = 8°, BW = 220 Hz/Px, FoV = 256 mm, 208 slices, and 0.8 mm isotropic voxels, with a GRAPPA phase-encoding acceleration factor of 2; T2: TR = 3,200 ms, TE = 563 ms, BW = 744 Hz/Px, FoV = 256 mm, 208 slices, 0.8 mm isotropic voxels, and 3.52 ms echo spacing, with a GRAPPA phase-encoding acceleration factor of 2). The T1 sequence lasted 6 min and 38 s, and the T2 sequence lasted 5 min and 57 s. All scans were reviewed by a radiologist for incidental findings of abnormalities and all images underwent visual quality control to assess for motion and were rated on a 3-point scale of Pass, Check, Fail (Backhausen et al., 2016 (link)). All 71 included participants were rated as Pass or Check before preprocessing; four participants that were originally collected for this study, did not have usable data and were excluded from this analysis (i.e., Fail and were not included).
8
Functional MRI data acquisition protocol for incidental encoding
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Functional MRI data were acquired during the incidental encoding session on a Siemens Magnetom Prisma 3T scanner equipped with a 64-channel head coil. For each of the four functional runs, approximately 185 volumes were recorded using a multi-band echo-planar imaging (EPI) sequence with the following parameters: 60 axial slices of 2mm depth, slice orientation parallel to the AC-PC line, phase-encoding in AP direction, repetition time (TR) of 2000ms, echo time (TE) of 30ms, 60-degree flip angle, 224mm × 224mm field of view (FOV), 2mm isotropic resolution, EPI factor of 112, echo distance of 0.58ms. For each block, four images were recorded before the start of the behavioral task to ensure equilibrium magnetization. These initial images were discarded as dummy scans during further analyses.
Following the last functional run, a T1-weigthed scan was acquired with 256 slices, coronal orientation, repetition time (TR) of 2300ms, echo time (TE) of 2.12ms, a 240mm x 240mm field of view (FOV), and a 0.8mm × 0.8mm × 0.9mm voxel size.
Following the last functional run, a T1-weigthed scan was acquired with 256 slices, coronal orientation, repetition time (TR) of 2300ms, echo time (TE) of 2.12ms, a 240mm x 240mm field of view (FOV), and a 0.8mm × 0.8mm × 0.9mm voxel size.
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