I was looking through some old notes and found this, hope this helps:
PXE boot on the computer you wish to image.
At the first prompt, choose the option “Exit to command Prompt.”
Map a network drive to your distribution share and run ImageX. Example:
net use x: \\bddserver\distribution
cd x:\Tools\x86
imagex /capture c: x:\Captures\ImageName.wim “Computer Image Description”
Source: http://lukenotley.wordpress.com/2007/05/20/bdd-2007-how-to-capture-a-reference-computer-image/
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