Split MRI and structuralMRI

[UlrikeS91]

We should add a specific term for structural MRI and keep MRI as the superclass for this term (and all others such as fMRI).

We have MRI registered like this:
https://github.com/openMetadataInitiative/openMINDS_instances/blob/main/instances/latest/terminologies/technique/magneticResonanceImaging.jsonld

We should update this one to represent the superclass, and add a new instances for structural MRI.

@lzehl and @tgbugs

[lzehl]

@spieschnik could you take this over?

[spieschnik]

Do we have ontology definitions for the techniques MRI, fMRI and sMRI @tgbugs?
The one we are currently using for MRI describes fMRI and sMRI together.

Otherwise I suggest the following definitions:
magnetic resonance imaging: : "Any medical imaging technique that uses strong magnetic fields, magnetic field gradients, and radio waves to generate images of a specimen based on the principle of nuclear magnetic resonance."
synonyms: MRI, unspecified magnetic resonance imaging

functional magnetic resonance imaging: : "A magnetic resonance imaging technique that generates multiple images over time of some physiological processes of a specimen."
synonyms: fMRI

structural magnetic resonance imaging: : "A magnetic resonance imaging technique that generates static images of some aspect of the structural anatomy of a specimen."
synonyms: magnetic resonance imaging, MRI, sMRI

[lzehl]

quantitative magnetic resonance imaging: "Any magnetic resonance imaging technique that generates images of a specimen based on the physical parameters of the local tissue microstructural environment."
synonyms: qMRI

exists already without definition and synonyms

[lzehl]

note: we need to do the split as well for the other techniques?
(high field MRI, ultra high field MRI, etc?)

@UlrikeS91 @spieschnik @tgbugs?