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Add swi and minIP suffixes for susceptibility weighted imaging #2343

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Add swi and minIP suffixes for susceptibility weighted imaging #2343

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4 changes: 4 additions & 0 deletions src/modality-specific-files/magnetic-resonance-imaging-data.md
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Original file line number Diff line number Diff line change
Expand Up @@ -237,6 +237,8 @@ and a guide for using macros can be found at
"PDT2",
"UNIT1",
"angio",
"swi",
"minIP",
])
}}

Expand All @@ -261,6 +263,8 @@ and a guide for using macros can be found at
"PDT2",
"UNIT1",
"angio",
"swi",
"minIP",
]
)
}}
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22 changes: 22 additions & 0 deletions src/schema/objects/suffixes.yaml
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Expand Up @@ -727,6 +727,17 @@ meg:
description: |
Unprocessed MEG data stored in the native file format of the MEG instrument
with which the data was collected.
minIP:
value: minIP
display_name: Minimum intensity projection
description: |
In arbitrary units (arbitrary).
Minimum intensity projection is a post-processing technique
applied to susceptibility weighted images (SWI),
where the minimum intensity is projected across a slab
of a specified thickness
([Haacke et al., 2004](https://doi.org/10.1002/mrm.20198)).
unit: arbitrary
motion:
value: motion
display_name: Motion
Expand Down Expand Up @@ -881,6 +892,17 @@ svs:
display_name: Single-voxel spectroscopy
description: |
MRS acquisitions where the detected MR signal is spatially localized to a single volume.
swi:
value: swi
display_name: Susceptibility weighted image
description: |
In arbitrary units (arbitrary).
Susceptibility weighted imaging (SWI) is a contrast mechanism
that combines magnitude and phase information from gradient-echo
sequences to enhance the visibility of substances with magnetic
susceptibility different from surrounding tissues
([Haacke et al., 2004](https://doi.org/10.1002/mrm.20198)).
unit: arbitrary
trace:
value: trace
display_name: Trace-weighted diffusion image
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14 changes: 14 additions & 0 deletions src/schema/rules/files/raw/anat.yaml
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Expand Up @@ -53,6 +53,20 @@ parametric:
$ref: meta.templates.raw.mri.entities
task: optional

swi:
suffixes:
- swi
- minIP
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@effigies effigies Apr 10, 2026

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Are these both raw images (i.e., you get them off a scanner) or should minIP be a derivative?

Also, is minIP ever sensibly used in a non-SWI context?

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@tsalo tsalo Apr 10, 2026

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I think the scanner will produce minIP images. Also, I got minIP images from an angio scan in ds002278 (see the JSON).

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@effigies effigies Apr 10, 2026

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How are minIP used? Are they for looking at or processing? If just looking at, minIP as a suffix seems fine, but if not, maybe it's more a stat-minIP_swi than a mod-swi_minIP?

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@tsalo tsalo Apr 10, 2026

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@astewartau would be better able to answer that, but I think they're for looking at.

extensions:
- .nii.gz
- .nii
- .json
datatypes:
- anat
entities:
$ref: meta.templates.raw.mri.entities
task: optional

defacemask:
suffixes:
- defacemask
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