MRI data (3.0 Tesla (GE, Waukesha, WI) were acquired at high-resolution with T1-weighted anatomical images for co-registration using the following parameters: 3D Spoiled Gradient Recalled at steady state protocol (SPGR), slice thickness = 1 mm, voxel size = 0.94×0.94×1.00 mm, number of excitations (NEX) = 1, repetition time (TR) = 9.6 ms, field of view = 240 mm, echo time (TE) = 3.9 ms, inversion recovery preparation time = 450 ms, flip angle = 12°, resolution = 256×224, and sequence duration = 6 min. Resting state fMRI data were collected with eyes open (with a fixation cross) using the following standard parameters: gradient echo planar images (6 min acquisition time, 36 slices, axial plane), 4.0 mm isotropic voxels, field of view = 240 mm, slice thickness = 1.0 mm, TR/TE = 2000/25 ms, NEX = 1 mm, resolution = 64×64, flip angle = 77°.
3.0 tesla
Manufactured by GE Healthcare
Sourced in United States
The 3.0 Tesla is a powerful magnetic resonance imaging (MRI) system designed and manufactured by GE Healthcare. It utilizes a 3.0 Tesla superconducting magnet to generate a strong and stable magnetic field for high-resolution imaging. The system is capable of producing detailed anatomical images and functional information to support a wide range of clinical applications.
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6 protocols using 3.0 tesla
1
High-Resolution Multimodal MRI Acquisition
2
MRI Analysis of Cerebral Pathologies
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MRI scans were performed on a 3.0 tesla General Electric (GE) MRI scanner in a university hospital setting. PVS were analyzed in T2 axial sequences (TR (repetition time) 4671, TE (time to echo) 130.6, slice thickness 3 mm) and white matter hyperintensities were analyzed on 3D T2 FLAIR (fluid-attenuated inversion recovery) axial sequences (TR 6002.0, TE 136.6, slice thickness 2 mm). Additionally, Ax T2 3D SWAN (susceptibility-weighted angiography), 3D Ax T1, and DWI (diffusion weighted imaging) sequences were analyzed to exclude other clinically significant pathologies.
3
Imaging Protocols for Lumbosacral and Pelvic Evaluation
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The clinical data included demographic information and primary clinical symptoms. Lumbosacral CT scans were acquired using 3 CT scanners (from GE Healthcare, Siemens Healthcare, and Philips Healthcare) with the following parameters: 120 kV, 240–260 mA, 5-mm slice thickness, a 1.25-mm reconstruction, and a CT dose index (CTDI) vol of 7–14 mGy.
Pelvic MRI was performed with 1.5-Tesla or 3.0-Tesla equipment (from GE Healthcare and Siemens Healthcare). The MRI protocol comprised sagittal and axial T1-weighted spin-echo (SE) sequences, T2-weighted fast spin-echo (FSE) sequences, and post-contrast T1-weighted SE sequences. T1-weighted fat-saturated turbo SE sequences were performed when a short T1 signal intensity lesion was detected.
Newborns were wrapped tightly after feeding to promote sleep. Patients, who could not cooperate to complete the MRI examination, orally took 0.80 mL/kg per body mass of 6.5% chloral hydrate before the examination to control movement.
Pelvic MRI was performed with 1.5-Tesla or 3.0-Tesla equipment (from GE Healthcare and Siemens Healthcare). The MRI protocol comprised sagittal and axial T1-weighted spin-echo (SE) sequences, T2-weighted fast spin-echo (FSE) sequences, and post-contrast T1-weighted SE sequences. T1-weighted fat-saturated turbo SE sequences were performed when a short T1 signal intensity lesion was detected.
Newborns were wrapped tightly after feeding to promote sleep. Patients, who could not cooperate to complete the MRI examination, orally took 0.80 mL/kg per body mass of 6.5% chloral hydrate before the examination to control movement.
4
Harmonizing MRI Acquisition for Stroke
5
Stereotactic Targeting of Deep Brain Structures
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The image fusion technique was applied in all cases. On the day of surgery, computed tomography (CT) of the brain was performed axially, in 1.25 mm intervals, with a stereotactic localizer. The standard 3T magnetic resonance (MR) images' (GE, 3.0 Tesla, USA) settings were T1 three-dimensional fast spoiled gradient echo (FSPGR) axial images of 1.0 mm thickness, with and without contrast enhancement and T2 FSPGR (T2W FSE) axial images at a 2 mm thickness. Each of these sequences was performed in contiguous slices. All images were transferred in a DICOM database through the PACS system to an S7 workstation (Medtronic, Minneapolis, MN, USA). Image fusion software was used to fuse all sets of MR images to CT scan images. The tentative surgical target coordinates for the tip of the permanently implantable electrode were set at the central lowest border of the STN through direct visualization on MR images and adjusted with indirect coordinates.
6
Evaluating Vascular Spin Labeling Techniques
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The EC sensitivity of different VS labeling pulses was evaluated in a spherical phantom filled with agar 25 on a 3.0 Tesla, MR750 scanner (General Electric, Milwaukee, WI) using a 32-channel receive coil (Nova Medical, Wilmington, MA). Four VS labeling schemes with the same parameters as in the Bloch simulation were tested: sBIR8-VSS, rect-VSI, segmented-sinc-VSI, and sinc-VSI. The images under the label and control conditions were collected 400 ms after the application of the VS pulses. The VS gradient pulses were applied along the superoinferior direction. The signals under the control condition were used as the reference. The signal difference between the label/control conditions was calculated and then normalized to the reference signal to give a subtraction error as an indicator for the EC sensitivity. Note that the T 2 relaxation was compensated in this process.
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