All imaging data included in the longitudinal statistical analysis of group differences reported in the Results were collected with the same 3 Tesla CXK4 short-bore Excite-2 MR system (General Electric, Milwaukee, WI), with an 8-channel phase-array head coil at the UCSD Keck FMRI Center. Eight high-bandwidth receivers for ultra-short TR times reduced signal distortions and signal dropout. Sessions involved a scout scan for head placement and slice selection, followed by a sagittal high-resolution 3d T1-weighted anatomical MRI (FOV 24 cm, 256 × 256 × 192 matrix, 0.94 × 0.94 × 1 mm voxels, 176 slices, TR=20 ms, TE=4.8 ms; flip angle 12°; 9 minutes).
8 channel phase array head coil
Manufactured by GE Healthcare
Sourced in United States
The 8-channel phase-array head coil is a medical imaging device designed for use with MRI (Magnetic Resonance Imaging) systems. It is a specialized RF (Radio Frequency) coil that provides high-quality, multi-channel signal reception for imaging the human head. The coil features eight independent receive channels, which allows for improved signal-to-noise ratio and accelerated image acquisition compared to traditional single-channel coils. This device is intended to be used by qualified healthcare professionals as part of their MRI imaging procedures.
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Lab products found in correlation
Cxk4 short bore excite 2 mr system, by GE Healthcare (2 mentions)
Cxk4 short bore, by GE Healthcare (2 mentions)
Excite 2 mr system, by GE Healthcare (2 mentions)
Signa excite, by GE Healthcare (2 mentions)
3t scanner, by GE Healthcare (1 mentions)
8 channel coil, by GE Healthcare (1 mentions)
Signa hdxt scanner, by GE Healthcare (1 mentions)
Mri system, by GE Healthcare (1 mentions)
Signa mri, by GE Healthcare (1 mentions)
Discovery mr750, by GE Healthcare (1 mentions)
18 protocols using 8 channel phase array head coil
1
High-Resolution 3D T1-Weighted MRI Protocol
2
Multiparametric MRI Examination Protocol
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MRI examinations were performed with a Signa HDx 3-T MR scanner using an 8-channel phase array head coil (GE Healthcare, Milwaukee, WI). All patients underwent conventional MR sequences axial T1-weighted imaging (T1WI) with a repetition time (ms)/echo time (ms) of 195/4.76 and axial T2-weighted imaging (T2WI) with 4000/98 and T2WI-FLuid Attenuated Inversion Recovery (T2WI-FLAIR) with 8000/95 and an inversion time (TI) of 2371.8 ms. Axial contrast-enhanced T1WI (T1WI-CE) was repeated after intravenous administration of 0.1 mmol/kg of gadolinium contrast with gadopentetate dimeglumine. A total of 63 patients underwent the axial DWI sequence with TR/TE 5000/74. Other MR sequence parameters included slice thickness and slice intervals of 6.0/1.2 mm, while field of view (FOV) was 240×240 mm for all axial sequences. DWI scans used the SE/EPI sequence, and the diffusion coefficient of sensitivity was selected as 0.1000 s/mm2. The original DWI maps were transmitted to ADW4.4 (Advanced Workstation 4.4) to generate axial ADC maps using GE software processing.
3
Multimodal Neuroimaging Protocol for Resting-State Analysis
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MRI scans were acquired on a whole body 3 T GE MRI with an 8-channel phase array head coil. The scanning protocol involved collection of a localizer followed by a high-resolution T1 structural scan, two resting state scans of 6 min each, a second high-resolution structural scan, and finally a 55-direction diffusion MRI (dMRI) scan. Since not all participants had both resting-state scans, only the first of the two was analyzed by default, unless visual inspection revealed overt artifact in which case the second scan was used if it was available. For the resting-state scan, instructions were presented utilizing a back-projection screen located in the MR bore and viewed through a mirror mounted on the head coil. Participants were instructed to remain awake and alert and keep their gaze on a fixation cross (+) presented approximately at the center of their field of view for the duration of the scan. (See Appendix, Methods: Section A).
4
High-resolution 3D T1-weighted MRI Acquisition
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All imaging data (baseline and follow-up) were collected from the same 3-Tesla CXK4 short bore Excite-2 MR system (General Electric, Milwaukee, WI) with an 8-channel phase-array head coil at the UCSD Keck FMRI Center. Eight high bandwidth receivers for ultra-short TR times reduced signal distortions and signal dropout. Participants were placed comfortably on the scanner table and the head was stabilized within the head coil using foam cushions (NoMoCo Pillow, La Jolla, CA). Scan sessions involved a 10-s scout scan to assure good head placement and slice selection covering the whole brain, followed by a sagittally-acquired high-resolution 3d T1-weighted anatomical MRI that lasted 7 min and 26 s (FOV 24 cm, 256 × 256 × 192 matrix, 0.94 mm × 0.94 mm × 1 mm voxels, 176 slices, TR = 20 ms, TE = 4.8 ms; flip angle 12°). Total scan time was ∼60 min.
5
Resting-State fMRI Acquisition Protocol
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All participants were subjected to MRI scanning using a 3.0-T GE Signa EXCITE scanner with an 8-channel phase array head coil. The RS-fMRI sensitized to alterations in BOLD signal levels of the whole brain was obtained via an echo-planar imaging (EPI) sequence. The parameters of scanning were listed as follows: repetition time (TR) = 2,000 ms, echo time (TE) = 30 ms, flip angle = 90°, slice thickness = 5 mm with no slice gap, field of view (FOV) = 240 × 240 mm2, 30 axial slices, and 200 time points in each run. In the MRI examination, participants were informed to be relaxed and keep their eyes closed without falling asleep. Foam padding was used to reduce head motion while earplugs were used for reducing the scanner noise.
6
Functional Brain Imaging with GE 3T Scanner
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A General Electric 3T scanner with an 8-channel phase-array head coil at the Mind Research and Imaging Center of National Cheng-Kung University was used to acquire brain images. Functional images were acquired in the form of T2*-weighted transverse echo planar images (EPI) comprising 40 axial slices, with a repetition time (TR) of 2 s, an echo time (TE) of 33 ms, a FOV of 192 × 192 mm2, an in-plane resolution of 3 × 3 mm, a slice thickness of 3 mm, and a voxel size of 3 × 3 × 3 mm3. Slices were oriented parallel to each participant’s anterior and posterior commissure (AC–PC) line, covering the whole brain. In addition, a high-resolution T1-weighted 3D-SPGR anatomical scan was acquired for the purpose of co-registration between structural and functional images and for anatomically localizing brain regions for functional activations.
7
Diffusion Tensor Imaging Acquisition Protocol
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All DTI data were obtained on a GE EXCITE 3 T MR scanner with an 8-channel phase array head coil. A single-shot spin-echo echo planar image (SE-EPI) sequence with the following parameters was performed: repetition time/echo time (TR/TE) = 10,000/70.8 ms; matrix = 256 × 256; field of view (FOV) = 240 × 240 mm2; Flip angle (FA) = 90°; slice thickness = 3 mm no gap, 50 contiguous axial slices. The diffusion sensitizing gradients were applied along 15 non-collinear directions (b = 1000 s/mm2). An image without gradients (b0) was also acquired. Daily quality assurance, including a spin echo sequence to warm up the scanner and to verify the signal-to-noise ratio of images, was performed to ensure the quality and consistency of acquired images. Foam cushions were used to reduce head movement, and the acquired MR images were further inspected by an experienced neuroradiologist for possible head movement.
8
3T MRI and Diffusion Tensor Imaging Protocol
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All MRI scans were acquired using the same 3 T GE Signa HDxt scanner (GE Healthcare, Milwaukee, WI, USA), equipped with an 8-channel phase array head coil at CHA Bundang Medical Center, CHA University. The parameters for threedimensional (3D) T1-weighted fast spoiled gradient recalled echo (3D T1-FSPGR) imaging were as follows: repetition time (TR)=16 ms, echo time (TE)=4.3 ms, flip angle=10°, field of view (FOV)=25.6 cm, matrix=256×256, slice thickness=1.7 mm, and isotropic voxel size=1×1×1 mm3. We acquired diffusion-weighted images using an echo planar imaging sequence with the following parameters: TR=17,000 ms, TE=108 ms, FOV=24 cm, matrix=144×144, slice thickness=1.7 mm, and voxel size=1.67×1.67×1.7 mm3. We used the double-echo option to reduce the eddy-current-related distortions. An 8-channel coil and the array spatial sensitivity encoding technique (ASSET; GE Healthcare) with a sensitivity encoding (SENSE) speed-up factor of 2 was used to reduce the impact of spatial distortions. We acquired 70 axial slices parallel to the anterior commissure-posterior commissure line covering the whole brain in 51 directions with b=900 s/mm2. We also acquired eight baseline scans with b=0 s/mm2. We used the least-squares method to estimate the diffusion tensor images (DTIs) from diffusion-weighted images.
9
Contrast-Enhanced T1-Weighted Brain Imaging
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The MRI scan was conducted via a 3 Tesla GE MRI system with an 8-channel phase-array head coil. The subjects were asked to keep their eyes closed, stay relaxed, and reduce movement. The parameters of the contrast-enhanced T1-weighted imaging were: time repetition = 2000 ms, time echo = 30 ms, flip angle = 90°, slice thickness = 5 mm (no slice gap), field of view = 240 × 240 mm2, 30 axial slices, and 200 volumes in each run.
10
Anatomical and Functional MRI Acquisition Protocol
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