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

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)

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.

Range Selection

We offer the following different types of range selection:

• Text Range Selection (Named Entity Recognition)
• Time Range Selection

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)

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.

Audio Clip Annotation

Annotation of audio clips using classification or time range selection. Supports .wav and .mp3 files up to 100 MB. Available on both DiagnosUs and the web labeling interface.

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: