Hi Mark, thanks for your reply.
Ok, great, I also had the intuition that measuring the field was independent of the acquisition, except in case of motion/reshimming.
The problem is that in public databases (ADNI for example) this parameter is not given and dicom does not contain it despite a dicom field being defined for it.
Magic recipe such as: "effective echo spacing = (1000 * water_fat_shift)/(434.215 * (echo_train_length+1))" for Philips Achieva seems to be scanner specific and are not mentionned in any public documentation.
Anyway, I am going to try on acquisitions for which this is available.
Bests.
basile
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