<html>
<body>
Hello,<br><br>
<br>
<blockquote type=cite class=cite cite=""><font face="arial" size=2>1. I
want to generate X-Ray 2D image from the 3D volume. Some articles on the
internet mention that MIP projection can produce image look likes X-Ray
image, and some articles mention about "average intensity
projection" should be used to obtain X-Ray image. Which one (or
both) was wrong?</blockquote><br>
A MIP projection is a "maximum intensity projection" - the
maximum value encountered along the ray (either raw scalar or opacity
mapping) is used for resulting pixel value in the image. Therefore it is
not like an x-ray in which (usually) the whole volume contributes to the
final image. Average would be closer to an x-ray but remember this is
just a rough approximation. You could also write a ray cast function that
models x-ray attenuation (absorption and scattering) but keep in mind
that the ray cast mapper only cast primary rays so you couldn't account
for any second-order scattering effecfts.<br><br>
Lisa<br>
</font></body>
</html>