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Draw Profile Line

The Draw Profile Line tool visualizes the intensity profile of Hounsfield Units (HU) or grayscale values along a user-defined line in the slice views. This tool is useful for analyzing tissue boundaries, material transitions, and density gradients along a specific path.

Accessing the Tool​

  1. Navigate to the Measure tab in the ribbon
  2. Click the Draw Profile Line button in the Measurement tools section
Prerequisites

An active volume dataset must be loaded in the project.

User Interface​

Description​

Displays: "Visualize the intensity profile of the Hounsfield Units (HU) or Grayscale Values (GV) of the active volume dataset along a user-defined line."

Options​

ControlDescription
Graph typeSelect the visualization style for the profile graph

Graph Type Options​

OptionDescription
BarDisplay the profile as a bar chart
LineDisplay the profile as a continuous line
Filled lineDisplay the profile as a line with filled area below

Profile Display​

The profile graph shows:

  • X-axis: Position along the line (in pixels or distance)
  • Y-axis: Intensity value (HU or grayscale)

Toolbar​

ButtonDescription
Export...Export the profile data to disk
Add (+)Enter line drawing mode to create a new profile line

Workflow​

Creating a Profile Line​

  1. Open the Draw Profile Line tool
  2. Click the Add (+) button to enter drawing mode
  3. Click in a 2D slice view to place the first point
  4. Click again in the same slice view to place the second point
  5. The intensity profile is generated and displayed automatically
note

Both points must be placed in the same slice view (sagittal, coronal, or axial). Clicking in a different view after the first point is ignored.

Interacting with the Profile Line​

After creating a profile line:

  • Move endpoints: Drag the line endpoints in the slice view to adjust the profile path
  • Profile updates automatically: The graph refreshes as you modify the line position

Interpreting the Profile​

The profile graph shows intensity values sampled along the line:

FeatureInterpretation
Sharp transitionsBoundaries between different tissues or materials
Gradual slopesGradual density changes
PlateausHomogeneous regions
SpikesNoise or small high-density inclusions

Export​

Click the Export... button to save the profile data to disk.

Export Format​

The profile data is exported as tabular data containing:

  • Position along the line
  • Intensity value at each position

Use Cases​

Material Analysis​

Draw profile lines across material boundaries to measure density transitions and interface characteristics.

Quality Assessment​

Analyze intensity uniformity along paths to check for imaging artifacts or inconsistencies.

Anatomical Analysis​

Measure tissue density gradients across anatomical structures for clinical or research purposes.

Threshold Determination​

Use the profile to identify appropriate threshold values for segmentation by observing intensity distributions across tissue boundaries.