[photo-3d] Re: 3D X-ray CT

[abram.klooswyk@xxxxxx]

Ron Beck  Apr 27, 2001:
>Anytime you have data that can provide x, y and z 
>coordinates, you can create a 3D model. 

>Some day I envision that doctors will be able to put on a 
>pair of "glasses" that will interact with the CT scanner and 
>provide the two views to show the object in 3D floating in 
>front of them. 

Dear Ron, "some day" is now. In our hospital we have
3D-CT viewing equipment with LCD shutter glasses and
we can rotate models interactively, cut parts away,
leave some overlaying structures out, etc. 
But it takes often a hour or so to prepare meaningful
3D models from the CT data, some cases _are_ complex.
Today this equipment is only available in a few hospitals,
but it will be everywhere in a few years.

(...) This is not "so-called" 3D this is "actual" 3D.

Seeing 3D rendered images on a screen _without_ twin-view
stereo viewing is looking at a flat 2D projection of
a 3D model. This is not "actual" 3D.
Yes, in the computer's "mind" is an actual 3D model.
but an ordinary screen (or X-ray film) shows a 2D image.

Some years ago I have said in a talk that, when people speak 
of "3D" when there actually only exists a 3D model in the 
"brain" of the computer, it shows that our culture is going to 
identify itself with the computer. What is in the computer's 
circuits is considered more real than what meets the eye...

Abram Klooswyk 


 

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