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JSON Format

{
  "id": "String",
  "createdAt": "Date",
  "updatedAt": "Date",
  "name": "String",
  "description": "String",
  "isPrivate": "Boolean",
  "labelGroups": [
    {
      "id": "String", // starts with `G_`
      "createdAt": "Date",
      "updatedAt": "Date",
      "name": "String",
      "description": "String",
      "type": "String", // STANDARD or METADATA
      "labels": [
        {
          "id": "String", // starts with `L_`
          "parentId": "String", // parent label id, if sublabel; starts with `L_`
          "createdAt": "Date",
          "updatedAt": "Date",
          "name": "String",
          "shortName": "String",
          "description": "String",
          "color": "String", // hexadecimal color code
          "type": "String", // GLOBAL or LOCAL
          "scope": "String", // STUDY, SERIES, or INSTANCE
          "annotationMode": "String", // e.g., bbox, freeform, polygon, etc.
          "radlexTagIds": ["String"] // array of RadLex ontology unique identifiers
        }
      ]
    }
  ],
  "datasets": [
    {
      "id": "String", // starts with `D_`
      "type": "String", // e.g., DICOM
      "createdAt": "Date",
      "updatedAt": "Date",
      "name": "String",
      "description": "String",
      "studies": [
        {
          "StudyInstanceUID": "String", // corresponds to DICOM study unique identifier
          "number": "Number" // corresponds to assigned exam number in project
        }
      ],
      "annotations": [
        {
          "id": "String", // starts with `A_`
          "parentId": "String", // parent annotation id, if applied from a sublabel; starts with `A_`
          "isImported": "Boolean",
          "createdAt": "Date",
          "createdById": "String", // user id; starts with `U_`
          "updatedAt": "Date",
          "updatedById": "String", // user id; starts with `U_`
          "StudyInstanceUID": "String", // corresponds to DICOM study unique identifier
          "SeriesInstanceUID": "String", // corresponds to DICOM series unique identifier
          "SOPInstanceUID": "String", // corresponds to DICOM instance unique identifier
          "frameNumber": "Number", // frame number of a multiframe DICOM pixel_array
          "labelId": "String", // matches with label id above; starts with `L_`
          "annotationNumber": "Number", // tracking number for multiple annotations of a label on a single image
          "height": "Number", // image height
          "width": "Number", // image width
          "data": "Object",
          "note": "String",
          "radlexTagIds": ["String"], // array of RadLex ontology unique identifiers
          "reviewsPositiveCount": "Number", // number of positive reviews
          "reviewsNegativeCount": "Number" // number of negative reviews
        }
      ]
    }
  ]
}

Top Level

  • The top level consists of id, createdAt, updatedAt, name, description, isPrivate, labelGroups, datasets

Label Groups

  • The labelGroups have an id, createdAt, updatedAt, name, description, and labels.

Labels

  • The labels have an id, createdAt, updatedAt, name, description, color, type, scope, annotationMode, and radlexTagIds
  • labelGroups -> labels

Datasets

  • The datasets have an id, type, createdAt, updatedAt, name, description, studies and annotations.

Studies

  • The studies have a StudyInstanceUID (corresponds to DICOM study unique identifier), number (corresponds to assigned exam number in project), and findings.
  • datasets -> studies

Annotations

  • The annotations have an id, createdAt, createById, updatedAt, updatedById, StudyInstanceUID, SeriesInstanceUID, SOPInstanceUID, labelId (corresponds to labels), annotationNumber, height (of image), width (of image), data, note, and radlexTagIds.
  • datasets -> annotations -> data

Data depends on the annotationMode.

  1. Bounding box: x, y, height, width.
  2. Freeform, polygon, line: vertices - [ [x,y] ]
  3. Location: x, y point

Options:

  • annotationMode - bounding box, freeform, polygon, line, location
  • type - local or global
  • scope - for global labels, does the label apply to the image, series, or entire exam
  • isPrivate - projects can be public or private