Not likely, as the magnet you bring would probably saturate long before the field addition is going to be noticed.
Been in both last year, got the CD images as well, and it is an older unit, so no pretty rotation just static images, though there is a collection of CT scan images with the needles in my spine as well. Fun losing all sensation in your lower body for a week when the doc found the wrong nerve, and the relief is only temporary. You can feel your body move in the MRI from the field changes, and, even with no contrast injection, you can taste the field changes as you move through the unit, and my fillings definitely got hot going in and out, just from that magnetic field gradient.