04-entity-table.md

# Appendix IV: Entity table

This section compiles the entities (key-value pairs) described throughout this
specification, and establishes a common order within a filename.
For example, if a file has an acquisition and reconstruction label, the
acquisition entity must precede the reconstruction entity.
REQUIRED and OPTIONAL entities for a given file type are denoted;
empty cells imply that entities MUST NOT be specified.
Entity formats indicate whether the value is alphanumeric
(`<label>`) or numeric (`<index>`).

A general introduction to entities is given in the section on
[filename structure](../02-common-principles.md#file-name-structure),
while entity definitions are in [Appendix IX](09-entities.md).

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## Magnetic Resonance Imaging

{{ MACROS___make_entity_table(datatypes=["anat", "dwi", "func", "fmap", "perf"]) }}

## Biopotential Amplification (EEG and iEEG)

{{ MACROS___make_entity_table(datatypes=["ieeg", "eeg"]) }}

## Magnetoencephalography (MEG)

{{ MACROS___make_entity_table(datatypes=["meg"]) }}

## Positron Emission Tomography (PET)

{{ MACROS___make_entity_table(datatypes=["pet"]) }}

## Behavioral Data

{{ MACROS___make_entity_table(datatypes=["beh"]) }}

## Microscopy

{{ MACROS___make_entity_table(datatypes=["micr"]) }}