the thing about mri's
 

If you have any hardware then it would not be advisible to get the 1.3 tesla, it is too strong and can cause a lot of artifact or darkening of the film. i had this issue with one of my mri's. also, if you can find an upright mri facility it can help show the true compression. the tesla strenght is usually about .80 but it make up for it with the true position of function.