C-scan uses a projection of the ultrasonic data onto a plan view of the component being tested to create an image. This mapping technique is usually utilized for corrosion or thickness mapping, as well as visualization of cracks and inclusions in the component.

C-scan mapping is the best ultrasonic testing method to rapidly inspect large surfaces. Ultrasonic NDT technology can acoustically examine material and create complete inspection maps. The process is called C-scan mapping.