The MRI examinations were performed on a 3 Tesla system (SIEMENS, Skyra, Germany) with a 20-channel phase array head coil. High-resolution T1-weighted images were acquired with a magnetization prepared rapid gradient echo (MPRAG) sequence (repetition time = 8.5 ms, echo time = 2.97 ms, flip angle = 9°, filed of view = 256×256 mm², matrix = 256×256, number of sagittal slices = 176, slice thickness = 1mm, voxel size = 1×1×1mm³, no slice gap). MR images were inspected by 2 experienced neuroradiologists to exclude subjects with gross abnormalities and visual scan artifacts in the images.
20 channel phase array head coil
Manufactured by Siemens
Sourced in Germany
The 20-channel phase-array head coil is a medical imaging accessory designed for use with Siemens magnetic resonance imaging (MRI) systems. It features 20 individual receiver channels to enable parallel imaging and high-resolution imaging of the human head.
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Lab products found in correlation
5 protocols using 20 channel phase array head coil
1
High-Resolution T1-Weighted MRI Protocol
2
High-Resolution Brain Imaging with MP2RAGE and TOF-MRA
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A 3.0-Tesla MAGNETOM Skyra MRI scanner (Siemens AG, Erlangen, Germany) equipped with a 20-channel phase-array head coil was used to acquire 3-dimensional high-resolution structural images. Every subject was placed in a supine position and was asked to keep his or her head as still as possible during MRI acquisition. The following magnetization-prepared 2 rapid gradient echoes (MP2RAGE) acquisition parameters were used: repetition time (TR) = 4000 ms; echo time (TE) = 2.98 ms; inversion time (TI) = 0 ms; flip angle = 0°; field of view (FOV) = 256 × 256 mm; slice thickness = 1 mm; number of slices = 176; and voxel size = 1 mm × 1 mm × 1 mm.
An additional 3-dimensional time-of-flight MRA was carried out after the structural scan using the following parameters: TR = 20 ms; TE = 3.43 ms; FA = 18°; FOV = 640 × 580 mm; and slice thickness = 0.5 mm.
An additional 3-dimensional time-of-flight MRA was carried out after the structural scan using the following parameters: TR = 20 ms; TE = 3.43 ms; FA = 18°; FOV = 640 × 580 mm; and slice thickness = 0.5 mm.
3
PET and MRI Imaging of the Brain
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PET images were acquired using Gemini TF PET/CT (Philips Medical Systems)28 (link). 18F-FDG was administered intravenously at a dose of 5 MBq/kg after at least 6-h of fasting. After 30 min, brain images were taken in the static acquisition mode for 15 min. Ordered subset expectation maximization was used to iteratively reconstruct PET data onto the brain CT images. Subsequently, the 2 × 2 × 2 mm3 voxel size images were generated. MRI scans were obtained using a 1.5-T scanner (Aera, Siemens, Erlangen, Germany), equipped with a 20-channel phase-array head coil. The 3D-magnetization-prepared rapid acquisition with gradient-echo (MPRAGE) images were acquired using the following parameters: repetition time = 2800 ms, inversion time = 930 ms, echo time = 5.13 ms, spatial resolution = 0.8 × 0.8 × 1.0 mm3, and flip angle = 8°.
4
Standardized 3D-MPRAGE MRI Acquisition
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All enrolled patients underwent MRI at the TCVGH with a 1.5-T scanner (Aera, Siemens, Erlangen, Germany), using a 20-channel phase-array head coil. The T1-weighted 3-dimensional magnetization-prepared rapid acquisition with gradient-echo (3D-MPRAGE) images were obtained using the standard parameters. This includes the following: repetition time = 2,800 ms, inversion time = 930 ms, echo time = 5.13 ms, spatial resolution = 0.8 × 0.8 × 1.0 mm3, flip angle = 8°. Patients with poor MRI quality, such as motion or misalignment artifacts, were excluded.
5
Multimodal Neuroimaging Data Acquisition
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Images were acquired using a Siemens Prisma 3-T scanner with a 20-channel phase-array head coil. Data consisted of one functional run, containing 240 continuous whole-brain functional volumes that were acquired with a simultaneous multislice sequence supplied by Siemens as follows: slice planes scanned along the rectal gyrus, 64 slices, phase encoding direction from posterior to anterior; 2 mm thickness; 0.2 mm gap; multiband factor = 2, TR = 2000 ms, TE = 30 ms, FA = 90°, matrix size = 112 × 112, FOV = 224 × 224 mm, voxel size = 2 × 2 × 2 mm. T1-weighted anatomic images were acquired using a 3D MPRAGE sequence (192 slices, 1 mm thickness, TR = 2530 ms, TE = 2.98 ms, inversion time = 1100 ms, FA = 7°, FOV = 256 × 224 mm, voxel size = 0.5 × 0.5 × 1 mm, interpolated; matrix size = 512 × 448). Data of cohort B were downsampled to a resolution of 3 mm isovoxels for joint analysis with data from cohort A.
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