Discovery mr750 3.0 t mr system

Magnetic resonance imaging data were acquired using a Discovery MR750 3.0 T MR system (GE Medical Systems, Milwaukee, WI, USA) at the Stanford Center for Neurobiological Imaging. Whole-brain T1-weighted images were collected using a sagittal spoiled gradient echo (SPGR) pulse sequence [repetition time (TR) = 6240 ms; echo time (TE) = 2.34 ms; flip angle = 12°; spatial resolution = 0.9 mm × 0.9 mm × 0.9 mm; slice number = 186; scan duration = 315 s]. The T1-weighted images were used for anatomical segmentation and localization. Diffusion-weighted images were acquired using a single-shot, dual-spin-echo, echo-planar imaging sequence [96 unique directions; b = 2000 s/mm²; TR = 8500; TE = 93.6 ms; spatial resolution = 2 mm × 2 mm × 2 mm; slice number = 64; scan duration = 901 s) and included nine non-diffusion-weighted (b = 0 s/mm²) volumes.

Whole-brain diffusion-weighted and high-resolution T1-weighted images were collected using a Discovery MR750 3.0 T MR system (GE Medical Systems, Milwaukee, WI, USA), housed at the Stanford Center for Neurobiological Imaging. The T1-weighted images were used for anatomical registration (spoiled gradient echo (SPGR) pulse sequence; repetition time (TR) = 6,240 ms; echo time (TE) = 2.34 ms; flip angle = 12°; resolution = 0.9 mm isotropic; 186 slices; scan duration = 5 min 15 s). The diffusion-weighted scan was a single-shot, dual-spin-echo, echo-planar imaging sequence (96 unique directions; b = 2,000 s/mm²; TR = 8,500 ms; TE = 93.6 ms; resolution = 2 mm isotropic; 64 slices; scan duration = 15 min 1 s). Nine non-diffusion-weighted (b = 0 s/mm²) volumes were additionally collected for anatomical localization and registration purposes.

Neuro-microstructure reconstruction was performed based on MR 3D fast imaging employing the steady-state acquisition (3D-FIESTA) technique, an improved version of the 3D FIESTA sequence, using a Discovery MR750 3.0T MR system (GE Healthcare, Milwaukee, WI, United States) with a spinal coil. The scans included conventional T1-weighted, T2-weighted, and three-dimensional T2-weighted (3D-T2WI) axial nerve root reconstruction sequences. The 3D-T2W axial original images were then transferred into a GE AW4.6 reformat and 3D-MIP workstation.
High-resolution arbitrary-dimensional spherical curve planar reformation was performed. Based on the 3D-T2W axial thin-slice images, the cyst and the cyst-dura intersection planes were initially identified. Sagittal and coronal images were then reconstructed by setting each intersecting plane as the centre. Then, three-dimensional reconstruction was performed, focusing on the suspected leakage orificium of the cyst. The reconstructed images were subsequently imported into the PACS imaging system, after which the location and size of the SMCs were assessed.