[ENH] Add FA images

src/modality-specific-files/magnetic-resonance-imaging-data.md

@@ -696,8 +696,8 @@ In such a case, two files could have the following names:
 The user is free to choose any other label than `singleband` and
 `multiband`, as long as they are consistent across subjects and sessions.
 
-Scanner-generated TRACE and ADC volumes MAY be included using the
-`TRACE` and `ADC` suffixes.
+Scanner-generated TRACE, ADC and FA volumes MAY be included using the
+`TRACE`, `FA` and `ADC` suffixes.
 If TRACE or ADC volume filenames match a diffusion series with all applicable entities,
 such volumes SHOULD be computed from that series.
 Otherwise, some entity, such as [`acq-<label>`](../appendices/entities.md#acq),

src/schema/objects/suffixes.yaml

@@ -47,6 +47,11 @@ DF:
   display_name: Dark-field microscopy
   description: |
     Dark-field microscopy imaging data
+FA:
+  value: FA
+  display_name: Fractional Anisotropy image
+  description: |
+    Diffusion images reflecting the directionality of the diffusion tensor
 FLAIR:
   value: FLAIR
   display_name: Fluid attenuated inversion recovery image

src/schema/rules/files/raw/dwi.yaml

@@ -43,6 +43,7 @@ sbref:
 isotropic:
   suffixes:
     - ADC
+    - FA
     - TRACE
   extensions:
     - .nii.gz