> For the complete documentation index, see [llms.txt](https://docs.neuroinfodb.org/nidb/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.neuroinfodb.org/nidb/contribute/squirrel-data-sharing-format/specification-v1.0/modalities.md). # Modalities This is a list of common modalities available within squirrel. However, squirrel does not restrict modality codes, so any modality could be used in a dataset.

Modality Code	Description	DICOM Standard
AR	Autorefraction	true
ASMT	Content Assessment Results	true
AU	Audio	true
AUDIO	Audio	false
BDUS	Bone Densitometry (ultrasound)	true
BI	Biomagnetic Imaging	true
BMD	Bone Densitometry (X-ray)	true
CONSENT	Scanned image of a consent form	false
CR	Computed Radiography	true
CT	Computed Tomography	true
CTPROTOCOL	CT Protocol (Performed)	true
DG	Diaphanography	true
DOC	Document	true
DX	Digital Radiography	true
ECG	Electrocardiography	true
EEG	Electroencephelograhy	false
EPS	Cardiac Electrophysiology	true
ES	Endoscopy	true
ET	Eye tracking	false
FID	Fiducials	true
GM	General Microscopy	true
GSR	Galvanic skin response	false
HC	Hard Copy	true
HD	Hemodynamic Waveform	true
IO	Intra-Oral Radiography	true
IOL	Intraocular Lens Data	true
IVOCT	Intravascular Optical Coherence Tomography	true
IVUS	Intravascular Ultrasound	true
KER	Keratometry	true
KO	Key Object Selection	true
LEN	Lensometry	true
LS	Laser Surface Scan	true
MEG	Magnetoencephalography	false
MG	Mammography	true
MR	Magnetic Resonance	true
M3D	Model for 3D Manufacturing	true
NM	Nuclear Medicine	true
OAM	Ophthalmic Axial Measurements	true
OCT	Optical Coherence Tomography (non-Ophthalmic)	true
OP	Ophthalmic Photography	true
OPT	Ophthalmic Tomography	true
OPTBSV	Ophthalmic Tomography B-scan Volume Analysis	true
OPTENF	Ophthalmic Tomography En Face	true
OPV	Ophthalmic Visual Field	true
OSS	Optical Surface Scan	true
OT	Other	true
PLAN	Plan	true
PR	Presentation State	true
PT	Positron Emission Tomography (PET)	true
PX	Panoramic X-Ray	true
REG	Registration	true
RESP	Respiratory Waveform	true
RF	Radio Fluoroscopy	true
RG	Radiographic Imaging (conventional film/screen)	true
RTDOSE	Radiotherapy Dose	true
RTIMAGE	Radiotherapy Image	true
RTINTENT	Radiotherapy Intent	true
RTPLAN	Radiotherapy Plan	true
RTRAD	RT Radiation	true
RTRECORD	RT Treatment Record	true
RTSEGANN	Radiotherapy Segment Annotation	true
RTSTRUCT	Radiotherapy Structure Set	true
RWV	Real World Value Map	true
SEG	Segmentation	true
SM	Slide Microscopy	true
SMR	Stereometric Relationship	true
SR	Structured reporting (SR) Document	true
SRF	Subjective Refraction	true
STAIN	Automated Slide Stainer	true
SURGERY	Pre-surgical mapping plan	false
TG	Thermography	true
US	Ultrasound	true
VA	Visual Acuity	true
VIDEO	Video	false
XA	X-Ray Angiography	true
XC	External-camera Photography	true

--- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.neuroinfodb.org/nidb/contribute/squirrel-data-sharing-format/specification-v1.0/modalities.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.