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MPR Intensity Projection Modes

Overview​

Intensity projection methods in MPR Mode define how voxel values across a selected slab thickness are combined to produce a 2D image. OmegaAI supports three methods — Maximum Intensity Projection (MIP), Average Intensity Projection (AveIP), and Minimum Intensity Projection (MinIP) — each optimized for different diagnostic scenarios in CT and PET/CT imaging.

To learn more about MPR Mode, see Multi-Planar Reconstruction (MPR).

Selecting a Projection Method​

  1. Open the study in the Image Viewer and activate MPR Mode:

    • From the Viewport Menu — click the MPR button at the bottom of the active viewport.

    • From the toolbar — add via Customize Toolbar, then click MPR.

      MPR button location in the Viewport Menu and toolbar

  2. Click the downward arrow (▼) next to the MPR icon — a popup menu appears above the Viewport Menu with the three projection options.

  3. Select the desired projection method — Maximum Intensity (default), Average Intensity, or Minimum Intensity.

    Projection method popup menu showing MIP, AveIP, and MinIP options

All three orthogonal views — axial, sagittal, and coronal — update immediately to reflect the selected method.

Projection Methods​

Maximum Intensity Projection (MIP) — Default​

MIP projects the voxel with the highest attenuation value along each viewing direction onto the 2D image, producing a high-contrast representation of dense structures.

Clinical use: Identifying calcifications, nodules, vascular structures, and other high-attenuation findings.

Maximum Intensity Projection (MIP) example

Average Intensity Projection (AveIP)​

AveIP calculates the mean attenuation value of all voxels along each viewing direction and represents it in the 2D image, providing a balanced view of tissue density across the volume.

Clinical use: Assessing tissue perfusion, evaluating contrast distribution, and obtaining a representative view of attenuation across the volume.

Average Intensity Projection (AveIP) example

Minimum Intensity Projection (MinIP)​

MinIP projects the voxel with the lowest attenuation value along each viewing direction onto the 2D image, suppressing high-density signals to reveal low-attenuation structures and soft tissues.

Clinical use: Detection and characterization of low-attenuation lesions, soft tissue evaluation, and airway assessment.

Minimum Intensity Projection (MinIP) example

Quick Reference​

MethodUI LabelVoxel SelectedPrimary Use
MIPMaximum Intensity (default)Highest attenuationCalcifications, nodules, vessels, dense structures
AveIPAverage IntensityMean attenuationPerfusion, contrast distribution, balanced tissue assessment
MinIPMinimum IntensityLowest attenuationLow-attenuation lesions, soft tissue, airway evaluation