Article Figures & Data
Figures
- Fig 1.
Top row: T2-weighted images of a 19-year-old patient presenting with unilateral optic neuritis. One infratentorial lesion in the brain stem (arrow) could be identified on the 3T image but not on the corresponding 1.5T image. Bottom row: FLAIR images of a 30-year-old patient presenting with unilateral optic neuritis. The 3T image shows infratentorial lesions in the brain stem and the cerebellum (arrows) which were not prospectively identified on the corresponding 1.5T image.
- Fig 2.
Identical axial sections of FLAIR images within the supratentorial brain obtained at 3T (left) and 1.5T (right) MR imaging. One more juxtacortical lesion (arrow) could be identified on the 3T FLAIR images in comparison with the corresponding 1.5T examination.
Tables
Pulse Sequence System FLAIR T2 TSE T1 SE 1.5T 3T 1.5T 3T 1.5T 3T Field of view (mm) 230 230 230 230 230 230 Matrix 256 256 256 256 256 256 Section thickness (mm) 5 5 5 5 5 5 Measured voxel size (mm) 0.90/0.90/5 0.90/0.90/5 0.90/0.90/5 0.90/0.90/5 0.90/0.90/5 0.90/0.90/5 Turbo factor 29 38 23 16 Number of signals averaged 2 1 2 1 2 1 Repetition time (ms) 6000 12 000 3500 4100 500 500 Echo time (ms) 110 140 100 100 12 12 Inversion time (ms) 2000 2850 Acquisition time (min:s) 3:00 4:00 2:27 2:19 3:34 3:27 Note:— FLAIR indicates fluid-attenuated inversion recovery; TSE, turbo spin-echo; SE, spin-echo.
- Table 2:
Patients with discordant results between 1.5T and 3T according to Barkhof MR imaging criteria
Patient No. Clinical Presentation Number of Fulfilled MR Imaging Criteria Additional MR Imaging Criterion 1.5T 3T 1 Optic neuritis 0 1 ≥1 juxtacortical lesion 2 Optic neuritis 0 1 ≥1 infratentorial lesion 3 Brain stem syndrome 1 2 ≥9 T2 hyperintense lesions 4 Brain stem syndrome 1 2 ≥9 T2 hyperintense lesions 5 Brain stem syndrome 1 2 ≥1 juxtacortical lesion 6 Optic neuritis 1 2 ≥9 T2 hyperintense lesions 7 Optic neuritis 1 2 ≥1 infratentorial lesion 8* Optic neuritis 2 3 ≥1 infratentorial lesion 9* Optic neuritis 2 3 ≥9 T2 hyperintense lesions 10 Optic neuritis 3 4 ≥3 periventricular lesions 11 Spinal cord syndrome 3 4 ≥1 infratentorial lesion * Patient fulfilled 3 criteria instead of 2 at 3T, and they were therefore diagnosed of having lesion dissemination in space according to McDonald diagnostic criteria.
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