Posted by
M. Nur Heriawan on
Jun 08, 2007; 12:21pm
URL: http://imagej.273.s1.nabble.com/Plugin-announcement-MosaicJ-tp3699175p3699177.html
Dear ImageJ`ers,
Firstly, I would like to make sure...is it correct
that the CT values resulted from X-ray CT scanner is
only ranging from -1000 to 2000? So, if we consider
the relationship between CT value and bulk density of
material (rho) is:
CT value = 1000*rho - 1000
then only material with bulk density from 0 to
3 g/cc can be detected by using X-ray CT scanning.
In case our material contains a small material with
bulk density more than 3 g/cc (for example: mineral
pyrite has density around 5 g/cc), how we can detect
it from the CT image?
Secondly, after I did thresholding using ImageJ for my
CT image, I found that it contains of `cupping effect`
with darker color presents around the center part of
image. Cupping effect is one of the artificial effect
on CT image due to the beam hardening effect during
scanning process. Does anyone have experience to
remove this cupping effect by image processing?
Any comments and suggestions are very welcome.
Thank you.
---------------
M. Nur Heriawan
Laboratory of Applied Geoscience and Technology
Graduate School of Science and Technology
Kumamoto University, JAPAN
http://www.civil.kumamoto-u.ac.jp/tansa
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