| Re: Medical Imaging Question [message #16788 is a reply to message #16618] |
Wed, 18 August 1999 00:00   |
Peter Clinch
Messages: 98
Registered: April 1996
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David Fanning wrote:
> Not a bad idea, probably, but in my experience color
> is anathema to medical researchers. I take a great
> deal of abuse in my IDL classes when I display the
> CTSCAN image in color and upside down. :-(
Colour isn't anathema: look at PET nuclear medicine scans...
But with a 4096 level x ray or mri representation the problem with
colour is along the lines of "is blue bigger than red, or vice versa"
You can solve this one way using "temperature" type scales (think this
is what is done with PET, will ask next time I'm over at Nuclear
Medicine), but these tend to have fewer values than 12 bit: is pale red
"more" than deeper red? If so, how does it relate to deep yellow? And
so on... And will one person's scheme match another? probably not!
When selecting a background for our Uni web pages a pale cyan was an
option. I described it as "warm", many others rejected it as "too
cold"...
With a staright grey level, you know exactly where you are: more
intensity, more value.
Pete.
--
Peter Clinch University of Dundee
Tel 44 1382 660111 ext. 33637 Medical Physics, Ninewells Hospital
Fax 44 1382 640177 Dundee DD1 9SY Scotland UK
net p.j.clinch@dundee.ac.uk http://www.dundee.ac.uk/~pjclinch/
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