Re: Dose from dental x-ray

[julian.gibbs@mcmail.vanderbilt.edu]

     The effective dose equivalents reported to this group this week were 
     derived from organ doses generated by a Monte Carlo simulation of 
     photon transport.  The program accounted for primary and scattered 
     radiation, but not leakage.  It was written locally since there was 
     nothing available at the time we started that could account for the 
     complex inhomogeneities in the face.  We provided that by using a 3D 
     array of voxels derived from serial CT scans as phantom anatomy.  We 
     continue to refine the model--this is one of those projects that is 
     never finished.  We are just now getting appropriate hardware.  A job 
     that ran days on our 1980 low-level VAX runs minutes on my P166.
     
     I second your plea for e-mail addresses in signature blocks.  I 
     further plead for signature blocks.  My reader (I am forced by the 
     local system to use Lotus cc:Mail) strips sender information from most 
     but not all listserver output.
     

    ======================================================================
     S. Julian Gibbs, DDS, PhD                           Voice 615-322-3190
     Professor of Radiology                                FAX 615-322-3764
     Vanderbilt University Medical Center
     Nashville TN 37232-2675    Internet julian.gibbs@mcmail.vanderbilt.edu
     ======================================================================