MRI scans were performed on a MAGNETOM Skyra 3T scanner, configured with 20 channel receiver head coils (Siemens Healthcare, Erlangen, Germany). Fifty T2*-weighted gradient-echo echo planar imaging (EPI) volumes were acquired. Two repetitions were performed before a bolus injection of gadolinium-DTPA (Gd-DTPA, 0.2 ml/kg, administered at 5 ml/sec), and 48 repetitions were performed after injection of Gd-DTPA. Sequence parameters were TR: 2,300 ms; TE: 40 ms; flip angle: 30°; voxel size: 1.8 x1.8, matrix: 128 x 128; number of slices: 25; and slice thickness: 3.9 mm. Pre-processing of the perfusion MRI data was preformed using SPM software (version 12, UCL, London, UK) and included motion correction, and co-registration with MPRAGE T1 images. Individual gray matter (GM) and white matter (WM) segmentation of T1 anatomy was also performed to extract mean perfusion values. Whole-brain quantitative perfusion analysis was done as described [102 (link), 103 (link)]. CBF values were normalized.
20 channel receiver head coils
Manufactured by Siemens
Sourced in Germany
The 20-channel receiver head coils are a core component of medical imaging systems. They are designed to detect and receive radio frequency signals from the human body, enabling the generation of high-quality images for diagnostic and clinical applications.
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3 protocols using 20 channel receiver head coils
1
Quantitative Brain Perfusion MRI Protocol
2
Multi-Parametric MRI Acquisition for Brain Imaging
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MRI scans were performed on a MAGNETOM Skyra 3T scanner, configured with20-channel receiver head coils (Siemens Healthcare, Erlangen, Germany). The MRI protocol included dynamic susceptibility contrast (DSC), and post-contrast high-resolution MPRAGE 3D T1-weighted images.
MRI sequences parameters:
DSC: Fifty T2*-weighted gradient-echo echo planar imaging (EPI) volumes were acquired, two repetitions before a bolus injection of gadolinium-DTPA (Gd-DTPA, 0.2 ml/kg, administered at 5 ml/sec), 48 repetitions after injection of Gd-DTPA. Sequence parameters: TR: 2,300 ms, TE: 40ms, flip angle: 30°, voxel size :1.8 x1.8, matrix: 128x128, number of slices: 25, and slice thickness = 3.9 mm.
MPRAGE 3D: was acquired in sagittal orientation with 0.9 mm isotropic resolution. Sequence parameters: TR: 2,000 ms, TE: 2.41 ms, flip angle: 8°, TI: 928 ms, FOV: 245 x 245, and 192 contiguous slices.
MRI sequences parameters:
3
Multimodal Brain Imaging Protocol
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Brain imaging MRI scans were performed on a MAGNETOM Skyra 3 T scanner, configured with 20-channel receiver head coils (Siemens Healthcare, Erlangen, Germany). The MRI protocol included T2-weighted, 3D fluid attenuated inversion recovery (FLAIR), susceptibility weighted imaging (SWI), pre- and post-contrast high-resolution MPRAGE 3D T1-weighted, and diffusion tensor imaging (DTI).
Whole brain diffusion weighted images were acquired with the following parameters: 50 axial slices, slice thickness = 2.2 mm, voxel size = 1.5 × 1.5 mm, TR = 9300 ms, TE = 91 ms, and matrix = 128 × 128 mm. Diffusion gradients were applied along 30 noncollinear directions (b = 1000 s/mm2), and one volume without diffusion weighting.
Preprocessing of DTI images was preformed using the SPM software (version 12, UCL, London, UK) and included motion correction, co-registration with MPRAGE T1 images, spatial normalization, and spatial smoothing with kernel size of 6 mm full width half maximum (FWHM). Diffusion brain volume denoising was performed using the joint anisotropic LMMSE filter for stationary rician noise removal77 (link) and calculation of DTI-FA (fractional anisotropy) and MD (mean diffusivity) maps were performed using in house software written in MATLAB R2021b (MathWorks, Natick, MA).
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