What does minimum intensity projection (min-IP) display in CT imaging?

Minimum intensity projection (min-IP) is a technique used in CT imaging that specifically visualizes the lowest pixel values from a set of images. This projection is valuable in highlighting areas where the attenuation is minimal, such as regions containing air or fat. By selecting the minimum pixel values, the min-IP provides a unique view that can help in the identification of certain structures or lesions that might otherwise be obscured by higher density tissues.

Min-IP is particularly helpful in applications like assessing for the presence of emphysema in lung CT scans, as it can effectively outline air-filled spaces within the lungs. It contrasts with maximum intensity projection (max-IP), which would display the highest pixel values, typically for highlighting denser structures such as blood vessels or lesions.

In summary, the function of minimum intensity projection is centered on showcasing the minimum pixel values, making it an essential tool in the interpretation of specific pathologies in CT imaging.