Color Intensity Projection (CIP) Images
How to Interpret CIP Images
CIP images provide temporal information on blood flow from a number of sequential DSA images. The arrival time of contrast agent at a given location is color coded into a single composite image. The color of each pixel indicates the time that contrast arrived at that location. Structures with high contrast attenuation (e.g., larger vessels and vascular lesions) appear brighter.
Here is a DSA image at the beginning of the sequence ① and the corresponding CIP image ②.
- Red and orange: Areas that already received contrast agent.
- Yellow and green: Areas that are currently receiving contrast agent. These are the areas with the highest concentration of contrast agent in a given frame.
- Turquoise and blue: Areas that have not yet received contrast agent.
For further information, see:
Strother CM, Bender F, Deurerling-Zheng Y, et al. Parametric color coding of digital subtraction angiography. AJNR Am J Neuroradiol. 2010 May; 31(5):919-24. doi 10.3174/ajnr.A2020. Epub 2010 Feb 18. http://www.ajnr.org/content/31/5/919