Setting threshold for segmentation for a stack of images.

[Nikolaus Szeverenyi]

I want to segment high intensity regions in a stack of MRI images
(pixels that exceed a certain threshold).  Seems easy enough.

Image<Adjust>Threshold>Set  (e.g. Lower Threshold Level 800; Upper
Threshold Level 10000 -- with the intent to identify any region having a
value higher than 800).

No matter what value I put in for the upper threshold, it defaults to
the highest pixel value in the image that is currently displayed.  This
is not appropriate behavior for operations on a stack.  Other slices
invariably will have higher intensity pixels that are then lost in the
segmentation.  I want to be able to enter any value for these thresholds
and have it use these values.  What gives???

Anyone know what's going on?

Thanks,

Nick

--
ImageJ mailing list: http://imagej.nih.gov/ij/list.html

[Nikolaus Szeverenyi]

I want to segment high intensity regions in a stack of MRI images
(pixels that exceed a certain threshold).

Seems easy enough.

Image<Adjust>Threshold>Set (e.g. Lower Threshold Level 800; Upper
Threshold Level 10000 -- with the intent to identify any region having a
value higher than 800).

No matter what value I put in for the upper threshold, it defaults to
the highest pixel value in the image that is currently displayed. This
is not appropriate behavior for operations on a stack. Other slices
invariably will have higher intensity pixels that are then lost in the
segmentation.

I want to be able to enter any value for these thresholds and have it
use these values. What gives??? Anyone know what's going on?

Thanks, Nick

--
ImageJ mailing list: http://imagej.nih.gov/ij/list.html