Coregistration to B1ref can fail when using smaps

[lukeje]

If the "smap" procedure is used to correct for the receive sensitivity of a coil with strong receive sensitivity bias is used (e.g. a surface coil), registration to the B1ref recorded with the same coil fails. This seems to be because the bias uncorrected B1ref is registered to the bias corrected PDw image. I could not work out a good way to fix this problem within the Toolbox, and so at present I calculate the B1map/ref in a "dummy" run of the Toolbox, bias correct B1ref manually, and then feed them into another run of the Toolbox. It would be great if there were a simpler way to overcome this problem within the Toolbox itself.

[lukeje]

This is probably fixed (or at least mitigated) if the procedure from Balbastre, et al. MRM (2022) is used rather than the old procedure from Papp, et al. MRM (2016). This is because the new method does not try to remove the bias but rather attempts to equalise it between the acquisitions. Will add this to the documentation and close this issue after I have tested it...