Cranial MRI scanning was used for RBI patients by a GE 1.5T MR scanner (General Electric). The slice thickness of axial scans was 5 mm. Gadopentetate dimeglumine (Gd‐DTPA) was administered intravenously for enhanced scanning at a dose of 0.1 mmol/kg. Figure 1 illustrates representative images of the T2‐weighted and heterogeneous contrast enhancement in gadolinium‐enhanced T1‐weighted images of 2 patients with RBI.
Ge 1.5t mr scanner
Manufactured by GE Healthcare
Sourced in United States
The GE 1.5T MR scanner is a magnetic resonance imaging system that operates at a field strength of 1.5 Tesla. It is designed to generate high-quality images of the human body for diagnostic purposes. The system utilizes a strong magnetic field and radio waves to produce detailed images of various body structures and organs.
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5 protocols using ge 1.5t mr scanner
1
Cranial MRI Imaging of RBI Patients
2
Comprehensive MRI Assessment of Neurological Disorders
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Brain and spinal cord MRI scans were performed in all patients using a GE 1.5 T MR scanner (General Electric, Milwaukee, Wisconsin, USA). The slice thickness of the axial scans was 5 mm. Conventional MRI protocols were used in all patients: T1 with and without gadolinium enhancement (400/15.5 ms, TR/TE) and T2 (2500– 3500/100 ms, TR/TE) for spinal cord MRI; and T1 with and without gadolinium enhancement (2128–2300/11.6–12.4 ms, TR/TE), T2 (4600–4640/97.8–102 ms, TR/TE), and fluid-attenuated inversion recovery (FLAIR) (8800/120 ms, TR/TE) for brain MRI. Each patient underwent MRI scanning at the time of the initial diagnosis, prior to corticosteroid treatment. No patients were receiving immunomodulatory treatment at the time of the MRI scanning. The numbers, locations, and diameters of lessions were recorded. All image archives were reviewed with a DICOM viewer on a Macintosh computer. An experienced neuroradiologist and a neurologist, both of whom were blinded to the diagnostic categorization and the patients’ clinical features, each analyzed all of the MRI scans. The final assessments were made by consensus.
3
MRI Imaging for NMOSD Detection
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Brain, spinal cord, or optic nerve magnetic resonance imaging (MRI) scanning to detect NMOSDs was performed using a GE 1.5T MR scanner (General Electric, Milwaukee, WI, USA). The conventional MRI protocols were described in our previous paper (Zhang et al., 2014 ). Gadopentate dimeglumine (Gd‐DTPA) was intravenously administered at a dose of 0.1 mmol/kg, and at about 15 min after contrast injection, the T1‐weighted sequence was repeated. Patients were considered active upon MRI if there were one or more enhancing lesions in the T1‐weighted spin echo images after Gd‐DTPA injection. Lesion number and location were measured on axial sections with T2‐FLAIR sequences.
4
Comprehensive MRI Evaluation of Brain and Spinal Cord
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Brain and spinal cord MRI scans were carried out for all patients using a GE 1.5 T MR scanner (General Electric, Milwaukee, WI, USA). The slice thickness of the axial scans was between 3 and 5 mm. Conventional MRI protocols were used: T1 with and without gadolinium enhancement (400/15.5 ms, TR/TE) and T2 (2500–3500/100 ms, TR/TE) in spinal cord MRI; and T1 with and without gadolinium enhancement (2128–2300/11.6–12.4 ms, TR/TE), T2 (4600–4640/97.8–102 ms, TR/TE), and fluid-attenuated inversion recovery (FLAIR) (8800/120 ms, TR/TE) in brain MRI. A cross-sectional evaluation was also performed on all MRI scans of the brain, and brainstem lesions were classified as either having a ventral pattern, a dorsal pattern. The spinal cord was segmented into cervical and thoracolumbar regions. LETM is a spinal cord lesion that extends over 3 or more vertebral segments. All MRI scans were carried out prior to use of corticosteroid, immunomodulatory or immunosuppressive treatment. An experienced neuroradiologist and a neurologist, both of whom were blinded to the diagnostic categorization and the patients’ clinical features, each analyzed all of the MRI scans. The final assessments were made by consensus.
5
MRI Evaluation of USgHIFU Fibroid Ablation
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To evaluate the feasibility of USgHIFU ablation and the efficacy of treatment, CE-MRI was performed on each patient before and after USgHIFU treatment. A Philips 3.0 T MR scanner (Best, Netherlands) or GE 1.5 T MR scanner (Waukesha, USA) was used. The images in sagittal, axial and coronal planes were acquired, respectively, with the slice thickness/ spacing ¼5.0 mm/1.0 mm. With regard to T2-weighted imaging (T2WI), fibroids were classified as hypointense (with a signal intensity similar to that of skeletal muscle), isointense (signal intensity higher than skeletal muscle, but lower than myometrium), heterogeneous (the overall signal intensity composed of interspersed hypo-intense and iso-intense areas), or markedly homogeneous hyperintense (a signal intensity similar to or higher than that of myometrium), based on the relevant studies [13] . The degrees of fibroid enhancement were classified as a slight enhancement (where the degree of fibroid enhancement was lower than that of myometrium), intermediate (where the degree of enhancement was similar to that of the myometrium) or progressive enhancement (where the degree of enhancement was higher than that of the uterine myometrium).
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