All imaging data were obtained using a General Electric Medical Systems HDxt 3.0T MRI scanner. A circular polarized head coil was used with foam padding to restrict head motion. High‐resolution T1‐weighted sagittal anatomical images were acquired using a 3D sequence [flip angle 15; repetition time/echo time 30/6.0 ms; matrix 256 × 256; field of view (FOV) 240 ×240 mm; 1.2 mm thickness; no gap; 166 slices; NEX = 1; image resolution 0.94 ×0.94 ×1.20 mm].
Hdxt 3.0t mri scanner
Manufactured by GE Healthcare
Sourced in United States
The HDxt 3.0T MRI scanner is a magnetic resonance imaging (MRI) system manufactured by GE Healthcare. It operates at a field strength of 3.0 Tesla, providing high-resolution imaging capabilities. The core function of the HDxt 3.0T MRI scanner is to generate detailed images of the body's internal structures and organs through the use of strong magnetic fields and radio waves.
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Lab products found in correlation
5 protocols using hdxt 3.0t mri scanner
1
High-Resolution Structural Brain Imaging
2
Multimodal MRI Assessment of Brain Structure
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MRI scans were performed on a General Electric HDxt 3.0T MRI scanner with 8 channel head-coil (General Electric, Waukesha, WI, USA). The imaging protocol included diffusion tensor imaging (DTI), T1-weighted three-dimensional structure sequence, axial T2-weighted and fluid-attenuated inversion recovery images. Subjects with abnormalities other than atrophy or leukoaraiosis were excluded. DTI data were collected using spin echo single shot echo planar imaging sequence (repetition time (TR)/echo time (TE)/number of excitations = 8000 ms/87 ms/3; Matrix 128 × 128, field of view (FOV) 240 × 240 mm, 30 contiguous axial slices with slice thickness of 4 mm) with diffusion-sensitizing gradient orientations along 30 non-collinear directions (b = 1000 s/mm2) and with one scan without diffusion weighting (b = 0 s/mm2, b0). The acquisition time was 12 min 32 s.
T1-weighted three-dimensional structure data were collected using fast spoiled gradient recalled echo sequence (TR/TE/inversion time (TI) = 7 ms/2.9 ms/900 ms; Matrix 256 × 256, FOV 240 mm × 226 mm, slice thickness of 1.2 mm without intervals). The acquisition time was 6 min 7 s.
T1-weighted three-dimensional structure data were collected using fast spoiled gradient recalled echo sequence (TR/TE/inversion time (TI) = 7 ms/2.9 ms/900 ms; Matrix 256 × 256, FOV 240 mm × 226 mm, slice thickness of 1.2 mm without intervals). The acquisition time was 6 min 7 s.
3
Multimodal Neuroimaging Protocol for Task-Based fMRI
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Data were collected on a GE HDxT 3.0T MRI scanner with an eight-channel head coil. Three MRI sequences were acquired: a T1 structural scan (TR/TE = 6.16/2.18 ms, isotropic 1 mm3 voxels); two task-related functional FMRI EPI sequences (run 1 = 8 min; run 2 = 8 min 04 s). For the task EPI sequence we used the following parameters: TR = 2000 ms, TE = 30 ms, 29 interleaved slices, slice thickness = 3.6 mm; slice gap = 0.3 mm; matrix size = 64 × 64, FOV = 220 × 220 mm, voxel size = 3.75 × 3.75 × 3.90 mm. During the scan, real-time motion detection software was used to monitor participant cooperation. In case participants presented more than 0.9 mm of motion in more than 20 TRs before completing the run, we interrupted the experiment and ran the task again. We made one attempt to re-run the task if it was stopped due to excessive head motion.
4
MRI Protocol for Facial Nerve Visualisation
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All MRI data were acquired using a GE HDxt 3.0-T MRI scanner (GE Medical Systems, Inc., Milwaukee, WI, United States). Foam paddings and earplugs were applied to minimize head movement and scanner noise. During scanning, all participants were required to keep awake with eyes closed, remaining motionless and relaxed. The three dimensional fast imaging employing steady state acquisition (3D-FIESTA) and time-of-flight magnetic resonance angiography (TOF-MRA) were combined to more accurately visualize local microstructures (Bao et al., 2015 (link); Wang et al., 2016 (link), 2019 (link)). The reconstructed 3D-FIESTA images were applied to evaluate NVC degree in the root exit area of facial nerve for each HFS patient (Bao et al., 2015 (link); Wang et al., 2016 (link)). Then, high-resolution 3D T1-weighted images were obtained with the following parameters: 136 sagittal slices, thickness/gap = 1.0/0 mm, TR/TE = 10.7/4.9 ms, flip angle = 15°, FOV = 256 × 256 mm2, matrix = 256 × 256. Finally, the rs-fMRI data were acquired using gradient echo-planar sequence with the following parameters: TR/TE = 2000/35 ms, flip angle = 90°, 28 slices, thickness/gap = 4.0/0 mm, FOV = 240 × 240 mm2, matrix = 64 × 64, 150 contiguous functional volumes. It should be noted that none of the HFS patients had spasm onset during the data acquisition.
5
Multimodal MRI Acquisition Protocol
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Data was collected on a GE HDxT 3.0 T MRI scanner with an 8-channel head coil (Buchweitz et al., 2019 (link)). The following MRI sequences were acquired: a T1 structural scan (TR/TE = 6.16/2.18 ms, isotropic 1 mm3 voxels); two task-related 5-min 26-s functional fMRI EPI sequences; and a 7-min resting state sequence. The task and the resting-state EPI sequences used the following parameters: TR = 2,000 ms, TE = 30 ms, 29 interleaved slices, slice thickness = 3.5 mm; slice gap = 0.1 mm; matrix size = 64 × 64, FOV = 220 × 220 mm, voxel size = 3.44 × 3.44 × 3.60 mm (Buchweitz et al., 2019 (link)).
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