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

[idaho-smith.livejournal.com]

Yes to bell-curves for sensitvity vs. wavelength for each of the colour dependant chemicals "opsins".

_C_ones for _C_olour

_R_ods for ... erm ... _R_unning about in the woods at night without a gamekeeper seeing your torch.