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alexrockhill committed Apr 5, 2022
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11 changes: 3 additions & 8 deletions src/99-appendices/08-coordinate-systems.md
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Expand Up @@ -112,7 +112,7 @@ Restricted keywords for the `<CoordSysType>CoordinateSystem` field in the
- `4DBti`: ALS orientation and the origin between the ears
- `KitYokogawa`: ALS orientation and the origin between the ears
- `ChietiItab`: RAS orientation and the origin between the ears
- Any keyword from the list of [Standard template identifiers](#standard-template-identifiers)
- Any keyword from the list of [Standard template identifiers](#standard-template-identifiers): RAS orientation and the origin at the center of the gradient coil for template NifTI images

In the case that MEG was recorded simultaneously with EEG,
the restricted keywords for
Expand All @@ -138,7 +138,7 @@ Restricted keywords for the `<CoordSysType>CoordinateSystem` field in the
For more information, see the
[EEGLAB wiki page](https://eeglab.org/tutorials/ConceptsGuide/coordinateSystem.html#eeglab-hj-coordinate-system).

- Any keyword from the list of [Standard template identifiers](#standard-template-identifiers)
- Any keyword from the list of [Standard template identifiers](#standard-template-identifiers): RAS orientation and the origin at the center of the gradient coil for template NifTI images

In the case that EEG was recorded simultaneously with MEG,
the restricted keywords for
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is not aligned to ACPC, `ScanRAS` should be used.

- Any keyword from the list of
[Standard template identifiers](#standard-template-identifiers)
[Standard template identifiers](#standard-template-identifiers): RAS orientation and the origin at the center of the gradient coil for template NifTI images

## Image-based Coordinate Systems

Expand All @@ -195,11 +195,6 @@ Unless specified explicitly in the sidecar file in the

### Standard template identifiers

When using any of the below templates, coordinates should be in "world" (RAS+) space,
and not voxel indices.
If `<CoordSysType>CoordinateUnits` is not defined or applicable, then the units SHALL
be assumed to be millimeters (mm).

| **Coordinate System** | **Description** | **Used by** | **Reference** |
| ---------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------ | ---------------------------------------------------------------------------------------------------------------------------------- |
| ICBM452AirSpace | Reference space defined by the "average of 452 T1-weighted MRIs of normal young adult brains" with "linear transforms of the subjects into the atlas space using a 12-parameter affine transformation" | | [https://www.loni.usc.edu/research/atlases](https://www.loni.usc.edu/research/atlases) |
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