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marcus_hk t1_isgbpv9 wrote

If you have a dense 3D image, as in CT, then there is really no distinction between "within image" and "across slices" because these are the same thing, just along a different axis. Of course with sparse MRI slices, though, you're right.

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radio_wave t1_isgct2o wrote

Yup, modern CT and a fair bit of MRI is fully 3D imaging where this is less of a consideration. But something like 60 or 70% (anecdotal stats, am an MR physicist) of MR imaging is 2D slice by slice imaging where there will be value for some better interpolation approaches. And even for 3D imaging, non-isotropic scanning (typically thicker slices compared to in-plane resolution) is clinically common to keep scan times short and interpolation could be handy

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