Posted by
Robert Dougherty on
May 13, 2006; 2:58am
URL: http://imagej.273.s1.nabble.com/Fwd-Re-cut-and-paste-behavior-volumetry-tp3702785p3702786.html
Roland,
There may be a misunderstanding about Measure Stack's method filling in
intermediate ROIs. It performs a geometrical interpolation to generate
ROIs on slices between slices that have user-drawn ROIs. It does not
pay attention to the content of the image, so thresholding would not
have any effect on the ROI generation process. The user is expected to
manually draw enough ROIs that interpolation works well. Just drawing
ROIs on the first and last slice would only work for certain cone-like
volumes.
Bob
Robert P. Dougherty, Ph.D.
President, OptiNav, Inc.
(425) 467-1118
[hidden email]
http://www.optinav.com>
> Wayne, thanks a lot, it works...
>
> A further question to the community: I am segmenting
> organs on abdominal CT scans. After exporting the
> segmented data to a new stack, I need to measure
> volume. I tried the 'Measure Stack' plugin, which is
> good because it takes slice spacing into account also.
> For measurment, I have to select the ROI on the last
> and first desired slice. Then it finds the
> corresponding ROI-s on all slices. But it gets them
> completely wrong, even if I treshold the images, so I
> have to select ROI-s again on each slide again. It
> also does not handle multiple ROI-s on a slice.
> Voxel counter plugin does not give proper result
> (probably does not take slice spacing in account).
> So does anybody have an idea for measuring volume on a
> stack of Ct slices?
>
> Thank you in advance,
> Roland Makay
>
>
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