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MASILab / Synb0-DISCO

Distortion correction of diffusion weighted MRI without reverse phase-encoding scans or field-maps
https://my.vanderbilt.edu/masi
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Missing total readout time for Philips scanners #52

Open george-gifford opened 1 year ago

george-gifford commented 1 year ago

Hi there,

We have some scans that were performed on a Philips scanner, where we don't have the total readout time, so can't enter the correct value in acqparams.txt.

Am I right that this would preclude synb0-disco as the readout times between the b0 and T1 are different?

Many thanks, George

george-gifford commented 12 months ago

Apologies, the T1 is mentioned in error in the above message. The question is just whether there is a way to use synb0-disco when the information needed for the total readout time is missing, as it is for some Phillips scans.

schillkg commented 11 months ago

Yes - this is still entirely possible to use. In fact, it doesn't really matter what the total readout time is, all that matters is that topup will try to make the distorted data matched the undistorted synthesized image (which has an infinite bandwidth)...we generally default to something like 0.05 or similar for a total readout time.

george-gifford commented 11 months ago

That's great news ok! I'll default to 0.05.

Many thanks for dealing with this and other queries!