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Re: minimum intensity projection [message #40032]

Fri, 02 July 2004 08:15

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

maarten writes:

> I am trying to perform a minimum intensity projection on a 3d MRI
> dataset, and I was hoping if anyone ever wrote an algortithm to perform
> this. Because I am having some problems implementing this myself.

When we want a minimum projection image of one of our volumes,
we simply do this:

min_image = Min(volume, Dimension=3)

We have had some discussion with doctors about whether
this *means* anything, but it's easy enough to do, so
why not. :-)

More often they are interested in the maximum intensity
projection, which--of course--is done like this:

max_image = MAX(volume, Dimension=3)

If we are calculating a MIP Cine image, we will
do a bit a weighting of the values, otherwise
as the image rotates it is very difficult to
distinguish front from back.

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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		Re: minimum intensity projection By: David Fanning on Fri, 02 July 2004 08:15
		Re: minimum intensity projection By: Dick Jackson on Fri, 02 July 2004 08:01

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