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Update 10-functional-near-infrared-spectroscopy.md
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rob-luke authored May 28, 2021
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Expand Up @@ -306,12 +306,12 @@ Not all fnirs systems provide 3D coordinate information or digitisation capabili

Fields relating to the fNIRS optode positions:

| **Key name** | **Requirement level** | **Data type** | **Description** |
| ------------------------------------ | --------------------------------------------------------------- | ------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| fnirsCoordinateSystem | REQUIRED | [string][] | Defines the coordinate system in which the optode positions are expressed. See Appendix VIII for a list of restricted keywords for coordinate systems. If Other, provide definition of the coordinate system in NIRSCoordinateSystemDescription. |
| fnirsCoordinateUnits | REQUIRED | [string][] | Units in which the coordinates that are listed in the field NIRSCoordinateSystem are represented. MUST be m, cm, or mm. |
| fnirsCoordinateSystemDescription | RECOMMENDED, but REQUIRED if `fnirsCoordinateSystem` is `Other` | [string][] | Freeform text description or link to document describing the NIRS coordinate system system in detail (for example, "Coordinate system with the origin at anterior commissure (AC), negative y-axis going through the posterior commissure (PC), z-axis going to a mid-hemisperic point which lies superior to the AC-PC line, x-axis going to the right"). |
| fnirsCoordinateProcessingDescription | RECOMMENDED | [string][] | Has any post-processing (such as projection) been done on the optode positions (for example, "surface_projection", "none"). |
| **Key name** | **Requirement level** | **Data type** | **Description** |
| ----------------------------------- | -------------------------------------------------------------- | ------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| NIRSCoordinateSystem | REQUIRED | [string][] | Defines the coordinate system in which the optode positions are expressed. See Appendix VIII for a list of restricted keywords for coordinate systems. If Other, provide definition of the coordinate system in NIRSCoordinateSystemDescription. |
| NIRSCoordinateUnits | REQUIRED | [string][] | Units in which the coordinates that are listed in the field NIRSCoordinateSystem are represented. MUST be m, cm, or mm. |
| NIRSCoordinateSystemDescription | RECOMMENDED, but REQUIRED if `NIRSCoordinateSystem` is `Other` | [string][] | Freeform text description or link to document describing the NIRS coordinate system system in detail (for example, "Coordinate system with the origin at anterior commissure (AC), negative y-axis going through the posterior commissure (PC), z-axis going to a mid-hemisperic point which lies superior to the AC-PC line, x-axis going to the right"). |
| NIRSCoordinateProcessingDescription | RECOMMENDED | [string][] | Has any post-processing (such as projection) been done on the optode positions (for example, "surface_projection", "none"). |

Fields relating to the position of fiducials measured during an fnirs session/run:

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