verification of inclusion and non-inclusion criteria~information and collection of consent~standard imaging protocol prescribed as part of the usual treatment: sagittal T1 and T2 slices after injection of contrast product (Gadolinium), 3D STIR and 3D PSIR sequence.~3D FGAPSIR sequence at the level of the cervical cord for the duration of the additional sequence is 10 minutes, for a total examination time of 40 minutes (instead of 30 minutes)
verification of inclusion and non-inclusion criteria~information and collection of consent~standard imaging protocol prescribed as part of the usual treatment: sagittal T1 and T2 slices after injection of contrast product (Gadolinium), 3D STIR and 3D PSIR sequence.~3D FGAPSIR sequence at the level of the cervical cord for the duration of the additional sequence is 10 minutes, for a total examination time of 40 minutes (instead of 30 minutes)