Idle thought:

[cdave]

Colour is (badly) defined as the relative amount of one three frequencies of light waves reflected off a visible point.

Could you make a false colour ultrasound image by using three different frequencies of ultrasound? If so would they be of any use?

Comments

[sharikkamur.livejournal.com]

Yes, I'd forgotten that one. Just goes to prove what I've thought for a while - it's time to re-read Dirk Gently.