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MPR Average Intensity Projection & Minimum Intensity Projections

Overview​

This section guide radiologists in using different intensity projection options in the Image Viewer Module during PET/CT studies. These options include Minimum Intensity Projection (MinIP), Average Intensity Projection (AveIP), and the default Maximum Intensity Projection (MIP).

Selecting Intensity Projection Options​

  1. Launch the Image Viewer Module and select the PET/CT study you would like to view.

  2. Navigate to the Multiplanar Reconstruction (MPR) mode.

  3. Click on Adjustments option.

  4. A pop-up with three buttons will appear at the bottom:

    • MIP (Maximum Intensity Projection): This option will be selected by default.

    • MinIP (Minimum Intensity Projection)

    • AveIP (Average Intensity Projection)

  5. Click on your preferred projection method. The visual feedback in all three images will adjust accordingly.

Note: These buttons will remain visible as long as you are in MPR mode. Once you exit MPR mode they will no longer be displayed.

Understanding Intensity Projection Methods​

  • Minimum Intensity Projection (MinIP): This method projects the voxel with the lowest attenuation value along each view throughout the volume onto a 2D image. It can highlight lower-attenuation structures and soft tissues.

  • Average Intensity Projection (AveIP): This method calculates the average attenuation value for each voxel along each view throughout the volume and represents it in a 2D image. It provides a balanced representation of attenuation values across the volume.

  • Maximum Intensity Projection (MIP): This is the default method and it projects the voxel with the highest attenuation value along each view throughout the volume onto a 2D image.

Clinical Applications

  • MinIP: Useful for improving the detection and characterization of lesions and abnormalities, particularly in lower-attenuation structures and soft tissues.

  • AveIP: Provides insights into tissue perfusion and the distribution of contrast material, offering a balanced representation of attenuation values across the volume.

  • MIP: Offers a high-contrast view of high-attenuation structures, useful for identifying calcifications, nodules, and other abnormalities.