suffixes.yaml

---
# This file defines valid BIDS file suffixes.
# For rules regarding how suffixes relate to datatypes, see files in `rules/files/raw/`.
TwoPE:
  value: 2PE
  display_name: 2-photon excitation microscopy
  description: |
    2-photon excitation microscopy imaging data
BF:
  value: BF
  display_name: Bright-field microscopy
  description: |
    Bright-field microscopy imaging data
Chimap:
  value: Chimap
  display_name: Quantitative susceptibility map (QSM)
  description: |
    In parts per million (ppm).
    QSM allows for determining the underlying magnetic susceptibility of tissue
    (Chi)
    ([Wang & Liu, 2014](https://doi.org/10.1002/mrm.25358)).
    Chi maps are REQUIRED to use this suffix regardless of the method used to
    generate them.
  unit: ppm
CARS:
  value: CARS
  display_name: Coherent anti-Stokes Raman spectroscopy
  description: |
    Coherent anti-Stokes Raman spectroscopy imaging data
CONF:
  value: CONF
  display_name: Confocal microscopy
  description: |
    Confocal microscopy imaging data
DIC:
  value: DIC
  display_name: Differential interference contrast microscopy
  description: |
    Differential interference contrast microscopy imaging data
DF:
  value: DF
  display_name: Dark-field microscopy
  description: |
    Dark-field microscopy imaging data
FLAIR:
  value: FLAIR
  display_name: Fluid attenuated inversion recovery image
  description: |
    In arbitrary units (arbitrary).
    Structural images with predominant T2 contribution (also known as T2-FLAIR),
    in which signal from fluids (for example, CSF) is nulled out by adjusting
    inversion time, coupled with notably long repetition and echo times.
  unit: arbitrary
FLASH:
  value: FLASH
  display_name: Fast-Low-Angle-Shot image
  description: |
    FLASH (Fast-Low-Angle-Shot) is a vendor-specific implementation for spoiled
    gradient echo acquisition.
    It is commonly used for rapid anatomical imaging and also for many different
    qMRI applications.
    When used for a single file, it does not convey any information about the
    image contrast.
    When used in a file collection, it may result in conflicts across filenames of
    different applications.
    **Change:** Removed from suffixes.
FLUO:
  value: FLUO
  display_name: Fluorescence microscopy
  description: |
    Fluorescence microscopy imaging data
IRT1:
  value: IRT1
  display_name: Inversion recovery T1 mapping
  description: |
    The IRT1 method involves multiple inversion recovery spin-echo images
    acquired at different inversion times
    ([Barral et al. 2010](https://doi.org/10.1002/mrm.22497)).
M0map:
  value: M0map
  display_name: Equilibrium magnetization (M0) map
  description: |
    In arbitrary units (arbitrary).
    A common quantitative MRI (qMRI) fitting variable that represents the amount
    of magnetization at thermal equilibrium.
    M0 maps are RECOMMENDED to use this suffix if generated by qMRI applications
    (for example, variable flip angle T1 mapping).
  unit: arbitrary
MEGRE:
  value: MEGRE
  display_name: Multi-echo Gradient Recalled Echo
  description: |
    Anatomical gradient echo images acquired at different echo times.
    Please note that this suffix is not intended for the logical grouping of
    images acquired using an Echo Planar Imaging (EPI) readout.
MESE:
  value: MESE
  display_name: Multi-echo Spin Echo
  description: |
    The MESE method involves multiple spin echo images acquired at different echo
    times and is primarily used for T2 mapping.
    Please note that this suffix is not intended for the logical grouping of
    images acquired using an Echo Planar Imaging (EPI) readout.
MP2RAGE:
  value: MP2RAGE
  display_name: Magnetization Prepared Two Gradient Echoes
  description: |
    The MP2RAGE method is a special protocol that collects several images at
    different flip angles and inversion times to create a parametric T1map by
    combining the magnitude and phase images
    ([Marques et al. 2010](https://doi.org/10.1016/j.neuroimage.2009.10.002)).
MPE:
  value: MPE
  display_name: Multi-photon excitation microscopy
  description: |
    Multi-photon excitation microscopy imaging data
MPM:
  value: MPM
  display_name: Multi-parametric Mapping
  description: |
    The MPM approaches (a.k.a hMRI) involves the acquisition of highly-similar
    anatomical images that differ in terms of application of a magnetization
    transfer RF pulse (MTon or MToff), flip angle and (optionally) echo time and
    magnitue/phase parts
    ([Weiskopf et al. 2013](https://doi.org/10.3389/fnins.2013.00095)).
    See [here](https://owncloud.gwdg.de/index.php/s/iv2TOQwGy4FGDDZ) for
    suggested MPM acquisition protocols.
MTR:
  value: MTR
  display_name: Magnetization Transfer Ratio
  description: |
    This method is to calculate a semi-quantitative magnetization transfer ratio
    map.
MTRmap:
  value: MTRmap
  display_name: Magnetization transfer ratio image
  description: |
    In arbitrary units (arbitrary).
    MTR maps are REQUIRED to use this suffix regardless of the method used to
    generate them.
    MTRmap intensity values are RECOMMENDED to be represented in percentage in
    the range of 0-100%.
  unit: arbitrary
  minValue: 0
  maxValue: 100
MTS:
  value: MTS
  display_name: Magnetization transfer saturation
  description: |
    This method is to calculate a semi-quantitative magnetization transfer
    saturation index map.
    The MTS method involves three sets of anatomical images that differ in terms
    of application of a magnetization transfer RF pulse (MTon or MToff) and flip
    angle ([Helms et al. 2008](https://doi.org/10.1002/mrm.21732)).
MTVmap:
  value: MTVmap
  display_name: Macromolecular tissue volume (MTV) image
  description: |
    In arbitrary units (arbitrary).
    MTV maps are REQUIRED to use this suffix regardless of the method used to
    generate them.
  unit: arbitrary
MTsat:
  value: MTsat
  display_name: Magnetization transfer saturation image
  description: |
    In arbitrary units (arbitrary).
    MTsat maps are REQUIRED to use this suffix regardless of the method used to
    generate them.
  unit: arbitrary
MWFmap:
  value: MWFmap
  display_name: Myelin water fraction image
  description: |
    In arbitrary units (arbitrary).
    MWF maps are REQUIRED to use this suffix regardless of the method used to
    generate them.
    MWF intensity values are RECOMMENDED to be represented in percentage in the
    range of 0-100%.
  unit: arbitrary
  minValue: 0
  maxValue: 100
NLO:
  value: NLO
  display_name: Nonlinear optical microscopy
  description: |
    Nonlinear optical microscopy imaging data
OCT:
  value: OCT
  display_name: Optical coherence tomography
  description: |
    Optical coherence tomography imaging data
PC:
  value: PC
  display_name: Phase-contrast microscopy
  description: |
    Phase-contrast microscopy imaging data
PD:
  value: PD
  display_name: Proton density image
  description: |
    Ambiguous, may refer to a parametric image or to a conventional image.
    **Change:** Replaced by `PDw` or `PDmap`.
  unit: arbitrary
PDT2:
  value: PDT2
  display_name: PD and T2 weighted image
  description: |
    In arbitrary units (arbitrary).
    A two-volume 4D image, where the volumes are, respectively, PDw and T2w
    images acquired simultaneously.
    If separated into 3D volumes, the `PDw` and `T2w` suffixes SHOULD be used instead,
    and an acquisition entity MAY be used to distinguish the images from others with
    the same suffix, for example, `acq-PDT2_PDw.nii` and `acq-PDT2_T2w.nii`.
  unit: arbitrary
PDmap:
  value: PDmap
  display_name: Proton density image
  description: |
    In arbitrary units (arbitrary).
    PD maps are REQUIRED to use this suffix regardless of the method used to
    generate them.
  unit: arbitrary
PDw:
  value: PDw
  display_name: Proton density (PD) weighted image
  description: |
    In arbitrary units (arbitrary).
    The contrast of these images is mainly determined by spatial variations in
    the spin density (1H) of the imaged specimen.
    This contrast is achieved at short echo times and long repetition times;
    for gradient echo, this weighting is also possible with a short TR (TR<<T1) and a small flip angle.
  unit: arbitrary
PLI:
  value: PLI
  display_name: Polarized-light microscopy
  description: |
    Polarized-light microscopy imaging data
R1map:
  value: R1map
  display_name: Longitudinal relaxation rate image
  description: |
    In seconds<sup>-1</sup> (1/s).
    R1 maps (R1 = 1/T1) are REQUIRED to use this suffix regardless of the method
    used to generate them.
  unit: 1/s
R2map:
  value: R2map
  display_name: True transverse relaxation rate image
  description: |
    In seconds<sup>-1</sup> (1/s).
    R2 maps (R2 = 1/T2) are REQUIRED to use this suffix regardless of the method
    used to generate them.
  unit: 1/s
R2starmap:
  value: R2starmap
  display_name: Observed transverse relaxation rate image
  description: |
    In seconds<sup>-1</sup> (1/s).
    R2-star maps (R2star = 1/T2star) are REQUIRED to use this suffix regardless
    of the method used to generate them.
  unit: 1/s
RB1COR:
  value: RB1COR
  display_name: RB1COR
  description: |
    Low resolution images acquired by the body coil
    (in the gantry of the scanner) and the head coil using identical acquisition
    parameters to generate a combined sensitivity map as described in
    [Papp et al. (2016)](https://doi.org/10.1002/mrm.26058).
RB1map:
  value: RB1map
  display_name: RF receive sensitivity map
  description: |
    In arbitrary units (arbitrary).
    Radio frequency (RF) receive (B1-) sensitivity maps are REQUIRED to use this
    suffix regardless of the method used to generate them.
    RB1map intensity values are RECOMMENDED to be represented as percent
    multiplicative factors such that Amplitude<sub>effective</sub> =
    B1-<sub>intensity</sub>\*Amplitude<sub>ideal</sub>.
  unit: arbitrary
S0map:
  value: S0map
  display_name: Observed signal amplitude (S0) image
  description: |
    In arbitrary units (arbitrary).
    For a multi-echo (typically fMRI) sequence, S0 maps index the baseline signal
    before exponential (T2-star) signal decay.
    In other words: the exponential of the intercept for a linear decay model
    across log-transformed echos. For more information, please see, for example,
    [the tedana documentation](https://tedana.readthedocs.io/en/latest/\
    approach.html#monoexponential-decay-model-fit).
    S0 maps are RECOMMENDED to use this suffix if derived from an ME-FMRI dataset.
SEM:
  value: SEM
  display_name: Scanning electron microscopy
  description: |
    Scanning electron microscopy imaging data
SPIM:
  value: SPIM
  display_name: Selective plane illumination microscopy
  description: |
    Selective plane illumination microscopy imaging data
SR:
  value: SR
  display_name: Super-resolution microscopy
  description: |
    Super-resolution microscopy imaging data
T1map:
  value: T1map
  display_name: Longitudinal relaxation time image
  description: |
    In seconds (s).
    T1 maps are REQUIRED to use this suffix regardless of the method used to
    generate them.
    See [this interactive book on T1 mapping](https://qmrlab.org/t1_book/intro)
    for further reading on T1-mapping.
  unit: s
T1rho:
  value: T1rho
  display_name: T1 in rotating frame (T1 rho) image
  description: |
    In seconds (s).
    T1-rho maps are REQUIRED to use this suffix regardless of the method used to
    generate them.
  unit: s
T1w:
  value: T1w
  display_name: T1-weighted image
  description: |
    In arbitrary units (arbitrary).
    The contrast of these images is mainly determined by spatial variations in
    the longitudinal relaxation time of the imaged specimen.
    In spin-echo sequences this contrast is achieved at relatively short
    repetition and echo times.
    To achieve this weighting in gradient-echo images, again, short repetition
    and echo times are selected; however, at relatively large flip angles.
    Another common approach to increase T1 weighting in gradient-echo images is
    to add an inversion preparation block to the beginning of the imaging
    sequence (for example, `TurboFLASH` or `MP-RAGE`).
  unit: arbitrary
T2map:
  value: T2map
  display_name: True transverse relaxation time image
  description: |
    In seconds (s).
    T2 maps are REQUIRED to use this suffix regardless of the method used to
    generate them.
  unit: s
T2star:
  value: T2star
  display_name: T2\* image
  description: |
    Ambiguous, may refer to a parametric image or to a conventional image.
    **Change:** Replaced by `T2starw` or `T2starmap`.
  anyOf:
    - unit: arbitrary
    - unit: s
T2starmap:
  value: T2starmap
  display_name: Observed transverse relaxation time image
  description: |
    In seconds (s).
    T2-star maps are REQUIRED to use this suffix regardless of the method used to
    generate them.
  unit: s
T2starw:
  value: T2starw
  display_name: T2star weighted image
  description: |
    In arbitrary units (arbitrary).
    The contrast of these images is mainly determined by spatial variations in
    the (observed) transverse relaxation time of the imaged specimen.
    In spin-echo sequences, this effect is negated as the excitation is followed
    by an inversion pulse.
    The contrast of gradient-echo images natively depends on T2-star effects.
    However, for T2-star variation to dominate the image contrast,
    gradient-echo acquisitions are carried out at long repetition and echo times,
    and at small flip angles.
  unit: arbitrary
T2w:
  value: T2w
  display_name: T2-weighted image
  description: |
    In arbitrary units (arbitrary).
    The contrast of these images is mainly determined by spatial variations in
    the (true) transverse relaxation time of the imaged specimen.
    In spin-echo sequences this contrast is achieved at relatively long
    repetition and echo times.
    Generally, gradient echo sequences are not the most suitable option for
    achieving T2 weighting, as their contrast natively depends on T2-star rather
    than on T2.
  unit: arbitrary
TB1AFI:
  value: TB1AFI
  display_name: TB1AFI
  description: |
    This method ([Yarnykh 2007](https://doi.org/10.1002/mrm.21120))
    calculates a B1<sup>+</sup> map from two images acquired at interleaved (two)
    TRs with identical RF pulses using a steady-state sequence.
TB1DAM:
  value: TB1DAM
  display_name: TB1DAM
  description: |
    The double-angle B1<sup>+</sup> method
    ([Insko and Bolinger 1993](https://doi.org/10.1006/jmra.1993.1133)) is based
    on the calculation of the actual angles from signal ratios,
    collected by two acquisitions at different nominal excitation flip angles.
    Common sequence types for this application include spin echo and echo planar
    imaging.
TB1EPI:
  value: TB1EPI
  display_name: TB1EPI
  description: |
    This B1<sup>+</sup> mapping method
    ([Jiru and Klose 2006](https://doi.org/10.1002/mrm.21083)) is based on two
    EPI readouts to acquire spin echo (SE) and stimulated echo (STE) images at
    multiple flip angles in one sequence, used in the calculation of deviations
    from the nominal flip angle.
TB1RFM:
  value: TB1RFM
  display_name: TB1RFM
  description: |
    The result of a Siemens `rf_map` product sequence.
    This sequence produces two images.
    The first image appears like an anatomical image and the second output is a
    scaled flip angle map.
TB1SRGE:
  value: TB1SRGE
  display_name: TB1SRGE
  description: |
    Saturation-prepared with 2 rapid gradient echoes (SA2RAGE) uses a ratio of
    two saturation recovery images with different time delays,
    and a simulated look-up table to estimate B1+
    ([Eggenschwiler et al. 2011](https://doi.org/10.1002/mrm.23145)).
    This sequence can also be used in conjunction with MP2RAGE T1 mapping to
    iteratively improve B1+ and T1 map estimation
    ([Marques & Gruetter 2013](https://doi.org/10.1371/journal.pone.0069294)).
TB1TFL:
  value: TB1TFL
  display_name: TB1TFL
  description: |
    The result of a Siemens `tfl_b1_map` product sequence.
    This sequence produces two images.
    The first image appears like an anatomical image and the second output is a
    scaled flip angle map.
TB1map:
  value: TB1map
  display_name: RF transmit field image
  description: |
    In arbitrary units (arbitrary).
    Radio frequency (RF) transmit (B1+) field maps are REQUIRED to use this
    suffix regardless of the method used to generate them.
    TB1map intensity values are RECOMMENDED to be represented as percent
    multiplicative factors such that FlipAngle<sub>effective</sub> =
    B1+<sub>intensity</sub>\*FlipAngle<sub>nominal</sub> .
  unit: arbitrary
TEM:
  value: TEM
  display_name: Transmission electron microscopy
  description: |
    Transmission electron microscopy imaging data
UNIT1:
  value: UNIT1
  display_name: Homogeneous (flat) T1-weighted MP2RAGE image
  description: |
    In arbitrary units (arbitrary).
    UNIT1 images are REQUIRED to use this suffix regardless of the method used to
    generate them.
    Note that although this image is T1-weighted, regions without MR signal will
    contain white salt-and-pepper noise that most segmentation algorithms will
    fail on.
    Therefore, it is important to dissociate it from `T1w`.
    Please see [`MP2RAGE` specific notes](SPEC_ROOT/appendices/qmri.md#unit1-images)
    in the qMRI appendix for further information.
VFA:
  value: VFA
  display_name: Variable flip angle
  description: |
    The VFA method involves at least two spoiled gradient echo (SPGR) of
    steady-state free precession (SSFP) images acquired at different flip angles.
    Depending on the provided metadata fields and the sequence type,
    data may be eligible for DESPOT1, DESPOT2 and their variants
    ([Deoni et al. 2005](https://doi.org/10.1002/mrm.20314)).
angio:
  value: angio
  display_name: Angiogram
  description: |
    Magnetic resonance angiography sequences focus on enhancing the contrast of
    blood vessels (generally arteries, but sometimes veins) against other tissue
    types.
asl:
  value: asl
  display_name: Arterial Spin Labeling
  description: |
    The complete ASL time series stored as a 4D NIfTI file in the original
    acquisition order, with possible volume types including: control, label,
    m0scan, deltam, cbf.
aslcontext:
  value: aslcontext
  display_name: Arterial Spin Labeling Context
  description: |
    A TSV file defining the image types for volumes in an associated ASL file.
asllabeling:
  value: asllabeling
  display_name: ASL Labeling Screenshot
  description: |
    An anonymized screenshot of the planning of the labeling slab/plane
    with respect to the imaging slab or slices.
    This screenshot is based on DICOM macro C.8.13.5.14.
beh:
  value: beh
  display_name: Behavioral recording
  description: |
    Behavioral recordings from tasks.
    These files are similar to events files, but do not include the `"onset"` and
    `"duration"` columns that are mandatory for events files.
blood:
  value: blood
  display_name: Blood recording data
  description: |
    Blood measurements of radioactivity stored in
    [tabular files](SPEC_ROOT/common-principles.md#tabular-files)
    and located in the `pet/` directory along with the corresponding PET data.
bold:
  value: bold
  display_name: Blood-Oxygen-Level Dependent image
  description: |
    Blood-Oxygen-Level Dependent contrast (specialized T2\* weighting)
cbv:
  value: cbv
  display_name: Cerebral blood volume image
  description: |
    Cerebral Blood Volume contrast (specialized T2\* weighting or difference between T1 weighted images)
channels:
  value: channels
  display_name: Channels File
  description: |
    Channel information.
coordsystem:
  value: coordsystem
  display_name: Coordinate System File
  description: |
    A JSON document specifying the coordinate system(s) used for the MEG, EEG,
    head localization coils, and anatomical landmarks.
defacemask:
  value: defacemask
  display_name: Defacing Mask
  description: |
    A binary mask that was used to remove facial features from an anatomical MRI
    image.
dseg:
  value: dseg
  display_name: Discrete Segmentation
  description: |
    A discrete segmentation.

    This suffix may only be used in derivative datasets.
dwi:
  value: dwi
  display_name: Diffusion-weighted image
  description: |
    Diffusion-weighted imaging contrast (specialized T2 weighting).
eeg:
  value: eeg
  display_name: Electroencephalography
  description: |
    Electroencephalography recording data.
electrodes:
  value: electrodes
  display_name: Electrodes
  description: |
    File that gives the location of (i)EEG electrodes.
ephys:
  value: ephys
  display_name: Electrophysiology
  description: |
    Extra- or intracellular microelectrode recording data.
epi:
  value: epi
  display_name: EPI
  description: |
    The phase-encoding polarity (PEpolar) technique combines two or more Spin Echo
    EPI scans with different phase encoding directions to estimate the underlying
    inhomogeneity/deformation map.
events:
  value: events
  display_name: Events
  description: |
    Event timing information from a behavioral task.
fieldmap:
  value: fieldmap
  display_name: Fieldmap
  description: |
    Some MR schemes such as spiral-echo imaging (SEI) sequences are able to
    directly provide maps of the *B<sub>0</sub>* field inhomogeneity.
headshape:
  value: headshape
  display_name: Headshape File
  description: |
    The 3-D locations of points that describe the head shape and/or electrode
    locations can be digitized and stored in separate files.
ieeg:
  value: ieeg
  display_name: Intracranial Electroencephalography
  description: |
    Intracranial electroencephalography recording data.
inplaneT1:
  value: inplaneT1
  display_name: Inplane T1
  description: |
    In arbitrary units (arbitrary).
    T1 weighted structural image matched to a functional (task) image.
  unit: arbitrary
inplaneT2:
  value: inplaneT2
  display_name: Inplane T2
  description: |
    In arbitrary units (arbitrary).
    T2 weighted structural image matched to a functional (task) image.
  unit: arbitrary
m0scan:
  value: m0scan
  display_name: M0 image
  description: |
    The M0 image is a calibration image, used to estimate the equilibrium
    magnetization of blood.
magnitude:
  value: magnitude
  display_name: Magnitude
  description: |
    Field-mapping MR schemes such as gradient-recalled echo (GRE) generate a
    Magnitude image to be used for anatomical reference.
    Requires the existence of Phase, Phase-difference or Fieldmap maps.
magnitude1:
  value: magnitude1
  display_name: Magnitude
  description: |
    Magnitude map generated by GRE or similar schemes, associated with the first
    echo in the sequence.
magnitude2:
  value: magnitude2
  display_name: Magnitude
  description: |
    Magnitude map generated by GRE or similar schemes, associated with the second
    echo in the sequence.
markers:
  value: markers
  display_name: MEG Sensor Coil Positions
  description: |
    Another manufacturer-specific detail pertains to the KIT/Yokogawa/Ricoh
    system, which saves the MEG sensor coil positions in a separate file with two
    possible filename extensions  (`.sqd`, `.mrk`).
    For these files, the `markers` suffix MUST be used.
    For example: `sub-01_task-nback_markers.sqd`
mask:
  value: mask
  display_name: Binary Mask
  description: |
    A binary mask that functions as a discrete "label" for a single structure.

    This suffix may only be used in derivative datasets.
meg:
  value: meg
  display_name: Magnetoencephalography
  description: |
    Unprocessed MEG data stored in the native file format of the MEG instrument
    with which the data was collected.
motion:
  value: motion
  display_name: Motion
  description: |
    Data recorded from a tracking system store.
nirs:
  value: nirs
  display_name: Near Infrared Spectroscopy
  description: Data associated with a Shared Near Infrared Spectroscopy Format file.
optodes:
  value: optodes
  display_name: Optodes
  description: |
    Either a light emitting device, sometimes called a transmitter, or a photoelectric transducer, sometimes called a
    receiver.
pet:
  value: pet
  display_name: Positron Emission Tomography
  description: |
    PET imaging data SHOULD be stored in 4D
    (or 3D, if only one volume was acquired) NIfTI files with the `_pet` suffix.
    Volumes MUST be stored in chronological order
    (the order they were acquired in).
phase:
  value: phase
  display_name: Phase image
  description: |
    [DEPRECATED](SPEC_ROOT/common-principles.md#definitions).
    Phase information associated with magnitude information stored in BOLD
    contrast.
    This suffix should be replaced by the
    [`part-phase`](SPEC_ROOT/appendices/entities.md#part)
    in conjunction with the `bold` suffix.
  anyOf:
    - unit: arbitrary
    - unit: rad
phase1:
  value: phase1
  display_name: Phase
  description: |
    Phase map generated by GRE or similar schemes, associated with the first
    echo in the sequence.
phase2:
  value: phase2
  display_name: Phase
  description: |
    Phase map generated by GRE or similar schemes, associated with the second
    echo in the sequence.
phasediff:
  value: phasediff
  display_name: Phase-difference
  description: |
    Some scanners subtract the `phase1` from the `phase2` map and generate a
    unique `phasediff` file.
    For instance, this is a common output for the built-in fieldmap sequence of
    Siemens scanners.
photo:
  value: photo
  display_name: Photo File
  description: |
    Photos of the anatomical landmarks, head localization coils or tissue sample.
physio:
  value: physio
  display_name: Physiological recording
  description: |
    Physiological recordings such as cardiac and respiratory signals.
probe:
  value: probe
  display_name: A recording probe
  description: |
    A probe with one or more recording contacts.
probseg:
  value: probseg
  display_name: Probabilistic Segmentation
  description: |
    A probabilistic segmentation.

    This suffix may only be used in derivative datasets.
sbref:
  value: sbref
  display_name: Single-band reference image
  description: |
    Single-band reference for one or more multi-band `dwi` images.
scans:
  value: scans
  display_name: Scans file
  description: |
    The purpose of this file is to describe timing and other properties of each imaging acquisition
    sequence (each run file) within one session.
    Each neural recording file SHOULD be described by exactly one row. Some recordings consist of
    multiple parts, that span several files, for example through echo-, part-, or split- entities.
    Such recordings MUST be documented with one row per file.
    Relative paths to files should be used under a compulsory filename header.
    If acquisition time is included it should be listed under the acq_time header.
    Acquisition time refers to when the first data point in each run was acquired.
    Furthermore, if this header is provided, the acquisition times of all files that belong to a
    recording MUST be identical.
    Datetime should be expressed as described in Units.
    Additional fields can include external behavioral measures relevant to the scan.
    For example vigilance questionnaire score administered after a resting state scan.
    All such included additional fields SHOULD be documented in an accompanying _scans.json file
    that describes these fields in detail (see Tabular files).
sessions:
  value: sessions
  display_name: Sessions file
  description: |
    In case of multiple sessions there is an option of adding additional sessions.tsv files
    describing variables changing between sessions.
    In such case one file per participant SHOULD be added.
    These files MUST include a session_id column and describe each session by one and only one row.
    Column names in sessions.tsv files MUST be different from group level participant key column
    names in the participants.tsv file.
stim:
  value: stim
  display_name: Continuous recording
  description: |
    Continuous measures, such as parameters of a film or audio stimulus.
uCT:
  value: uCT
  display_name: Micro-CT
  description: |
    Micro-CT imaging data