Here is a video showing how useful Ultrasound scans are for evaluating damage on carbon bikes and parts.

In this example apart from the small paint damage there is very little indication of any damage to the head tube. However as you will see on the video there is a disbond between the Aluminium headset insert and the carbon head tube.

This is where specialist methods make all the difference, we can find damage that the others can't. It is difficult to repair something  they don't know is there!!