Define labeling task

Once your data has been imported, create your task. Tasks outline the objective for labelers, such as classifying the cell type or segmenting around a certain organ.

Before creating a task, (1) check whether your annotation type is supported, and (2) whether your task requires custom setup.

Supported Annotation Types

Classification

Labelers assign the whole case to one or more answer choices. Classification works across the data types we support, including images, DICOM, video, audio, text and PDF.

We offer the following different types of classification:

• Fixed answer choices (same answer choices for each case)
• Dynamic answer choices (answer choices vary based on case)
• Answer choices drawn from a large medical code set, such as ICD-10 or MedDRA. Centaur sets the code set up for your task, so ask your project manager.

Segmentation

We offer the following different types of segmentation:

• Polygon
• Box
• Line
• Circle
• Pixel

Tasks can be either single class (one class of annotations) or multi-class (two classes of annotations e.g. vessels and veins on heart ultrasounds)

When to choose pixel segmentation? Consider pixel segmentation if you have DICOM data that requires donut or complex 3D segmentations (i.e., 3D renderings developed from 2D segmentation masks). Pixel segmentation is not yet available on our DiagnosUs app, but is supported for our web labeling tool.

Box segmentation is also available on PDF assets, for marking regions of a document.

Range Selection

We offer the following different types of range selection:

• Text Range Selection (Named Entity Recognition), for highlighting spans of text
• Time Range Selection, for marking spans of time in video or audio

2D Point Segmentation

Annotation of precise (x, y) point coordinates, such as anatomical landmarks, within the Centaur DICOM Viewer. Currently available for DICOM Viewer tasks only.

Multiple questions per case

A task can ask more than one question about each case. Each question carries its own prompt and its own answer choices, and an answer choice can trigger a free-text follow-up question. Ask your project manager to set this up for your task.

Custom Set-up

Custom tasks must be created by the Centaur team.

Your task requires custom set-up if:

• The data is not an accepted file type
• The task type is classification with dynamic answer choices (see above)

Creating Tasks

Custom Set-up Required

Share the following information with your project manager:

• Task name (e.g., Mitosis Classification)
• Labeler prompt (e.g., “Classify the mitotic phase of each cell)
• Answer choices for classification tasks (e.g., prophase, anaphase, metaphase, telophase)

No Custom Set-up Required

Via API (recommended)

Follow these instructions to create your task via API.

Via Centaur Portal

• Go to your project
• Select + Create task and follow the instructions

Task Set-up Restrictions

Character limits for task set-up: