| MRI volume visulization [message #8752] |
Wed, 23 April 1997 00:00  |
partovi
Messages: 1
Registered: April 1997
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Junior Member |
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i admit to being a novice.
i am trying to visualize 92 MR brain slices as a volume (eg. surface
map) on a pentium pro, running NT 4.0, and IDL 4.x
the catch is, i am hoping (dreaming?) that i can rotate the volume
interactively, or near-interactively. any ideas if this is possible?
even just a yes / no would be appreciated so i don't waste time (or
waste newgroup space).
thank you kindly.
S. Partovi MD
Neuroradiology Fellow
Barrow Neurological Institute
Phoenix, AZ
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| Re: MRI volume visulization [message #8825 is a reply to message #8752] |
Fri, 25 April 1997 00:00  |
David Foster
Messages: 341
Registered: January 1996
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Senior Member |
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David Fanning wrote:
>
> S. Partovi writes:
>
>> i admit to being a novice.
>
> Oh, no. Here comes trouble. :-)
>
>> i am trying to visualize 92 MR brain slices as a volume (eg. surface
>> map) on a pentium pro, running NT 4.0, and IDL 4.x
>>
>> the catch is, i am hoping (dreaming?) that i can rotate the volume
>> interactively, or near-interactively. any ideas if this is possible?
>> even just a yes / no would be appreciated so i don't waste time (or
>> waste newgroup space).
>
> I can tell I am getting old when it is the yes or no questions that
> give me the most trouble!
>
> Well, Dr. Partovi, it *depends*. Do you mean rotate it with two
> or three degrees of freedom, backwards and forwards, like the
> spinning tea cups in AVS? Then, no, probably not. Especially
> with IDL 4. And not as a novice. :-)
>
> <snip>
Dr. Partovi -
I would say your best bet without doing any programming would be to
try out the SLICER program that comes with IDL. The interface is not
very intuitive, and the documentation even worse, but you can get
poor-to-fair volume visualization for MRI, especially if your
resolution is good (and 92 slices is pretty good). But the speed is
not impressive, definitely too slow for real-time rotations. IDL 5.0
on our Sun Ultra, which has the OpenGL accelerated graphics that this
version is supposed to take advantage of, was not much of an
improvement over 4.0.1 .
If you want to play around, I would suggest starting with the Slicer
program, or David Fanning's Slice program (http://www.dfanning.com).
To sum it up, 3D rendering in IDL is a bit of a disappointment, at
least for this application.
Dave
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~
David S. Foster Univ. of California, San Diego
Programmer/Analyst Brain Image Analysis Laboratory
foster@bial1.ucsd.edu Department of Psychiatry
(619) 622-5892 8950 Via La Jolla Drive, Suite 2200
La Jolla, CA 92037
[ UCSD Mail Code 0949 ]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~
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| Re: MRI volume visulization [message #8836 is a reply to message #8752] |
Thu, 24 April 1997 00:00 |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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S. Partovi writes:
> i admit to being a novice.
Oh, no. Here comes trouble. :-)
> i am trying to visualize 92 MR brain slices as a volume (eg. surface
> map) on a pentium pro, running NT 4.0, and IDL 4.x
>
> the catch is, i am hoping (dreaming?) that i can rotate the volume
> interactively, or near-interactively. any ideas if this is possible?
> even just a yes / no would be appreciated so i don't waste time (or
> waste newgroup space).
I can tell I am getting old when it is the yes or no questions that
give me the most trouble!
Well, Dr. Partovi, it *depends*. Do you mean rotate it with two
or three degrees of freedom, backwards and forwards, like the
spinning tea cups in AVS? Then, no, probably not. Especially
with IDL 4. And not as a novice. :-)
But if you mean you want it to *look* like it's rotating at
the beck and call of a user with one or perhaps two degrees
of freedom, and you don't have moral qualms about performing
some programming slight of hand, then *perhaps* you could
work something out. (You might have to take one of my
IDL programming classes.:-)
IDL 5.0 is suppose to help with this whole 3D rotation thing,
take advantage of the Open GL 3D acceleration, etc. My personal
observation of the released beta is that it seems just a tad
on the s-l-o-w side. I hear RSI is working hard to speed things
up and that the latest builds are faster. I hope so.
I guess I would suggest that if you have a little time you just
hang out and see what IDL 5 brings. In the meantime, plunge into
IDL. You might find another way to analyse that data without
making yourself dizzy. :-)
Cheers!
David
----------------------------------------------------------
David Fanning, Ph.D.
Fanning Software Consulting
Customizable IDL Programming Courses
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com
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| Re: MRI volume visulization [message #8845 is a reply to message #8752] |
Thu, 24 April 1997 00:00 |
kspencer
Messages: 21
Registered: December 1993
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Junior Member |
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partovi@theBNI.com (S. Partovi) writes:
> i admit to being a novice.
> i am trying to visualize 92 MR brain slices as a volume (eg. surface
> map) on a pentium pro, running NT 4.0, and IDL 4.x
> the catch is, i am hoping (dreaming?) that i can rotate the volume
> interactively, or near-interactively. any ideas if this is possible?
> even just a yes / no would be appreciated so i don't waste time (or
> waste newgroup space).
Yes. I thought IDL has something like what you want already. Check
out the manual...
Kevin
-----------------------------------------------------------
Kevin Spencer
Cognitive Psychophysiology Laboratory and Beckman Institute
University of Illinois at Urbana-Champaign
kspencer@s.psych.uiuc.edu
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