Tjaart van der Walt wrote:

> I've seen a system where a laser draws a grid on the patient's
> chest. The rest is then done in software hooked to a CCD.

  Yeah.  Nifty system.  One use for it was to measure the amount of milk
taken by a baby during a feed - without touching the baby of course!  It
was reckoned to be an improvement on the earlier technique which of
course involved a tub of water and hanging them in there to see how much
overflowed.

  That was an area of research I thought would be quite fun.  Sure beats
what I ONCE did...

  Cheers,
        Paul B.