X-Ray Spectra for CT Scanner

[B H Malayeri <bhm@festival.ed.ac.uk>]

Dear Colleagues;

I am looking for X-Ray Spectra for Computerised axial tomographic
(CT) scanners. 

I would be grateful if anybody could direct me  to  any  type  of
reference regarding the X-Ray  Spectra  for  different  types  of
CT scanners, especially for SIMENSE, GE, and PHLIPS scanners.

Since I am going to use this data  for  other  purposes,  if  you
could help me to find the relevant data files for CT scanners  on
the Internet it would be prefered. 

Thanks for your help;
Bijan
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