Mark,
Thank you for taking a look at the images. No distortion correction (besides
the eddy currents) was applied to these images. I was under the impression
that distortion algorithms need a fieldmap, which we did not acquire as part
of this data acquisition. Are there any distortion corrections available
within FSL that do not require a field map?
We are interested in good alignment within the brainstem, as we are using it
as the seed for tracing CST fibers. However, if good alignment of the
brainstem will be at the cost of mis-registration of other regions, as the
cortex for example, I agree that it will not be very beneficial in this case.
Is it possible to use the b-zero image to perform any type of distortion
correction?
Sincerely,
Anastasia
|