Posted by
M. Nur Heriawan on
Nov 18, 2006; 10:23am
URL: http://imagej.273.s1.nabble.com/Filters-Variance-tp3700988p3700991.html
Sincerely thank to Dr. Zhenyu and Robert Martin for
your comments regarding my CT image. Previously I
opened the CT image in *.BMP of 8-bit format using
ImageJ. That is why when I made profile, the gray
value always showed around 240-245. This really not
represented the CT value.
Actually when I checked again, I have the original CT
image in *.IMG, then I import (not open) it by raw and
set the format to be 16-bit signed with image size of
2048 x 2048. When I make a profile, the gray value
automatically corresponds to the CT value. Therefore
no need to make the calibration.
I have one request...may someone address me to the
references either books or papers that discussed about
relationship between CT value (or attenuation
coefficient) with (the density of) geological
material. Are there any standards for this
relationship?
Last question...is it possible to produce the contour
lines for the image (in my case is CT value) by using
ImageJ?
I appreciate any comments and advices from you all.
Thank you.
--- "M. Nur Heriawan" <
[hidden email]> wrote:
> Dear list,
>
> I am a new user of ImageJ. I would like to use
> ImageJ
> to analyze the sequence of images resulted from
> X-ray
> CT scanner.
>
---------------
M. Nur Heriawan
Lab. of Applied Geosciences & Tech.
Kumamoto Univ., Japan
http://www.civil.kumamoto-u.ac.jp/tansa/index.shtml
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