Are all mri machines the same? if not which mri machine is the best to diagnose ms? thank you

Larger "T" better: Generally, the larger the magnet strength the better. It is measured in teslas - 1 tesla is approximately 20, 000 times stronger than the earth's magnetic field. However, having a well "tuned" scanner is probably more important - so ask if the scanner is american college of radiology (acr) accredited. The process of accreditation requires high quality scanning and techniques.

3T is better: Do a websearch on 3t is better for ms and you will see that 3t mris see more lesions. Detect more enhancement. Using thin sagittal sections I have found you can sometimes see 300 percent - yes three times as many plaques on 3t than a similar study done at 1.5t. So yes 3t is better.

Variable: MRI images improve with higher magnetic flux, and a 3.0 T machine will show more lesions than a 1.5 T. But software is also critical, and such techniques as FLAIR, double inversion recovery, etc may find even elusive areas. If in doubt, might image both head and neck.