Open TheChymera opened 3 months ago
@TheChymera I mostly agree, but I would rather not use aircraft rotational coordinates (yaw, pitch, and roll), since they only have meaning if you know what the front and top of the probe are. Euler angles (alpha, beta, gamma) have a defined relationship to the x,y,z axes, so if one knows what the positive x,y and z directions are on the probe you can determine the rotational coordinates in Euler angles. If we do use aircraft coordinates, we'll need some way of determining what is the front and what is the top.
attn @effigies @bids-standard/bep032
As part of BEP032 the issue of documenting implants popped up.
I've dealt with this in the past as part of opto-fMRI in animals, but originally decided against including that in BIDS since it seemed like burdening the standard with too many ancillary details. However, since it's now being done for e-phys anyway, maybe a dedicated BEP to make sure implant support is provided either for both modalities in their own ways or in a modality-agnostic fashion would be a good idea.
The details I required for my experiments were:
The reason for not just specifying the target is that the target is the intention of the operation and neither the description of the operation nor necessarily the result of the operation. The info above documents the operation, and determining where the target ended up being is an analysis aspect. This has the advantage of providing a description of the intervention, and not a summary which may be contingent on thresholding/etc as part of an analysis process applied to MRI data. I imagine determining the exact actual target is even more unreliable in e-phys (as I understand BEP032 the proposed method is operator image evaluation).
This is in some contrast to BEP032 which specifies:
The list above excludes parameters which are relevant for the respective sorts of implants (e.g. numerical aperture and transmittance for optic fibers) which — if we should want to track them — would necessitate additional metadata space for each modality.
I'm curious whether you think that:
@chrisgorgo @yarikoptic @bendichter