Minimal Intensity Projection in CTVox

For visualization purposes, the technique of Maximum Intensity Projection (MIP) is becoming increasingly more popular. The MIP projects the highest intensity along the path of projection (which is perpendicular to the screen) and is used to highlight high dense structures. CTVox allows applying this in a straight forward user-friendly way. CTAn requires some intuitive interaction and 3D geometrical thinking while allowing more features, such as generating a stack of MIPs. Several applications are focusing on the lowest density phase, rather than the highest density, for example for the visualization of pore networks in reservoir rocks and food products, or the airways in lung tissue , micro-cracks in geothermal reservoirs, defects in car parts, ...

It is desirable to have a similar visualization method to achieve the results as displayed below. To this end, one can generate a Minimal Intensity Projection (MinIP), which projects the lowest intensity along the path of projection. This technique is not widely used. In this method note, we will introduce a way to generate minimal intensity projections in CTVox. Depending on the dataset, this can be achieved in CTVox by well-considered manipulation of the transfer function. For other datasets some processing steps should first be applied in CTAn to allow the use of the MIP option in CTVox as a MinIP. In the method note "MN034 Minimal Intensity Projection in CTVox" you will find a step by step procedure describing the different plugins that are used to generate the MinIP images.

Minimal Intensity Projection Image (MinIP) of the pore microstructure in a sandstone