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definitions.md

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Documentation for the definitions.json file

The definitions.json file contains machine-readable definitions of NIfTI-MRS standard meta data and dimension tags.

Type fields should be generic JSON types: number, string, array, object, bool or an array indicating a (optionally nested) array type and element type : [array, number] for a vector of numbers or [array, array, string] for a matrix of strings.

nifti-mrs version number.

Two numeric elements, major and minor

Possible dimension tags and descriptions

An object with keys as the possible tage, with documentation/use of those tags as the value.

Header fields

All header fields are defined with a JSON object containing type information type, appropriate unit definitions units, a dco string doc, and whether the field should be removed during anonymisation anon.

Required

Two fields are required, SpectrometerFrequency and ResonantNucleus.

Standard defined

These fields are optional but must not be redefined. This section currently contains:

5.1 MRS specific Tags

  • SpectralWidth
  • EchoTime
  • RepetitionTime
  • InversionTime
  • MixingTime
  • AcquisitionStartTime
  • ExcitationFlipAngle
  • TxOffset
  • VOI
  • WaterSuppressed
  • WaterSuppressionType
  • SequenceTriggered

5.2 Scanner information

  • Manufacturer
  • ManufacturersModelName
  • DeviceSerialNumber
  • SoftwareVersions
  • InstitutionName
  • InstitutionAddress
  • TxCoil
  • RxCoil

5.3 Sequence information

  • SequenceName
  • ProtocolName

5.4 Sequence information

  • PatientPosition
  • PatientName
  • PatientID
  • PatientWeight
  • PatientDoB
  • PatientSex

5.5 Provenance and conversion metadata

  • ConversionMethod
  • ConversionTime
  • OriginalFile

5.6 Spatial information

  • kSpace

5.7 Editing Pulse information structure

  • EditCondition
  • EditPulse

5.8 Processing Provenance

  • ProcessingApplied