Magnetic resonance imaging was performed using a 1.5 Tesla system (General Electric Medical Systems, Milwaukee, WI). Three-dimensional T1-weighted spoiled gradient-echo (SPGR) sequences with 124 1.5 mm slices, in-plane resolution 1.5mm x 1.5mm, TR = 35 ms, effective TE = 5 ms, flip angle = 3 were acquired axially. The same image acquisition parameters were used on the same MRI scanner for both baseline and follow-up assessments.
1.5 tesla system
Manufactured by GE Healthcare
Sourced in United States
The 1.5 Tesla system is a magnetic resonance imaging (MRI) device manufactured by GE Healthcare. It is designed to generate high-quality images of the human body using a magnetic field and radio waves. The 1.5 Tesla system produces a strong magnetic field that interacts with the hydrogen protons in the body, allowing for the generation of detailed images of internal structures and organs.
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5 protocols using 1.5 tesla system
1
Volumetric MRI Acquisition Protocol
2
Three-dimensional T1-weighted MRI Protocol
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Magnetic resonance imaging was performed using a 1.5 Tesla system (General Electric Medical Systems, Milwaukee, WI). Three-dimensional T1-weighted spoiled gradient-echo sequences with 124 1.5 mm slices (TR 35 ms, TEef 5 ms, flip angle 35°) were obtained.
3
MRI Evaluation of Intervertebral Disc
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At 14 days postoperatively, MRI was performed on all experimental rats using the 1.5 Tesla system (General Electric Company, Chicago, USA). The imaging sequence consisted of coronal spin echo T2‐weighted images (repletion time 3000 ms; echo time 80 ms; field of view 200 × 200 mm; slice thickness 1.4 mm). Four blinded investigators used the Pfirrmann classification to classify disc images into 5 grades.8 (link)
4
T1-weighted and Diffusion-Weighted MRI Acquisition
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Each subject T1-weighted MRI image was acquired in a General Electric 1.5 Tesla system. A high-resolution antenna was employed together with a homogenization Phased array Uniformity Enhancement filter (Fast Spoiled Gradient Echo sequence, TR/TE/TI = 11.2/4.2/450 ms; flip angle 12°; 1 mm slice thickness, 256 × 256 matrix and field of view (FOV) 25 cm).
The acquisition parameters for DWI were as follows: TE/TR 96.1/12000 ms; NEX 3 for increasing the SNR; 2.4 mm slice thickness, 128 × 128 matrix, and 30.7 cm FOV yielding an isotropic voxel of 2.4 mm; 1 image with no diffusion sensitization (i.e., T2-weighted b0 images); and 25 DWI (b = 900 s/mm2). Data were recorded with a single shot echo planar imaging sequence.
The acquisition parameters for DWI were as follows: TE/TR 96.1/12000 ms; NEX 3 for increasing the SNR; 2.4 mm slice thickness, 128 × 128 matrix, and 30.7 cm FOV yielding an isotropic voxel of 2.4 mm; 1 image with no diffusion sensitization (i.e., T2-weighted b0 images); and 25 DWI (b = 900 s/mm2). Data were recorded with a single shot echo planar imaging sequence.
5
Optimizing Thrombectomy Outcomes with MRA-based Mapping
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We retrospectively reviewed 57 consecutive patients with acute ischemic stroke who underwent mechanical thrombectomy at Sapporo Asabu Neurosurgical Hospital, Sapporo, Japan between April 2018 and May 2021. In total, 29 patients underwent MRA-based road mapping to visualize the para-aortic transfemoral access route before neuro-interventional procedures. We defined the para-aortic area as that covering the entire aorta and common carotid artery (CCA). There were 28 patients who only underwent routine head magnetic resonance imaging (MRI)/MRA without MRA-based road mapping of the para-aortic area. We compared the basic procedural time required for mechanical thrombectomy, such as “puncture to recanalization time” and “door to recanalization time” between the groups with or without pre-procedural MRA-based road mapping. We also evaluated the time from femoral artery puncture to placing the guiding catheter at the ICA (“puncture to device placement time”) and the time from admission to placing the guiding catheter at the internal carotid artery (“door to device placement time”). Finally, we evaluated the activity of daily living of the patients at transfer by modified Rankin Scale (mRS) in the group with MRA-based road mapping. In all patients, MRI and MRA were performed using a 1.5-Tesla system (GE Healthcare) without contrast material.
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