Re: Patient dose from dental radiography

[muckerheide@highway1.com (James Muckerheide)]

julian.gibbs@mcmail.vanderbilt.edu wrote:
> 
> Dose at skin entry for intraoral dental films is now of the order of 1-1.5 mGy
> (sometimes a bit less) depending on projection and beam energy (dentists
> currently use machines ranging from ca 50 to 80 kVp half-wave rectified and in
> some newer machines 60-70 kVcp).  Skin dose from panoramics is difficult to
> specify because of the changing source-skin distance as the machine traverses
> its prescribed path.
> 
> Julian Gibbs

A good note about EDE (below) vs skin entry, but is EDE for a dental
x-ray like thinking about the "life-shortening effect" of hitting
(tapping) your finger with a hammer?  :-)  And since dose is e/mass, as
Vic Bond, John Cameron and others have often noted, the idea of adding
them is like thinking about adding 1 hit to each finger as 10 hits to 1
finger? 


Regards, Jim Muckerheide
jmuckerheide@delphi.com
 
> ______________________________ Reply Separator _________________________________
> Subject: Re: Patient dose from dental radiography
> Author:  radsafe@romulus.ehs.uiuc.edu at +inet
> Date:    2/13/97 10:38 AM
> 
> May I assume that this is skin entrance dose to the jaw?
> 
> In Message Wed, 12 Feb 97 13:44:38 -0600,
>   julian.gibbs@mcmail.vanderbilt.edu writes:
> 
> >     Current consensus estimates for effective dose (in some cases
> >     effective dose equivalent) from dental radiography:
> >
> >        Full-mouth intraoral (ca 20 films)      40 uSv
> >        Panoramic                               10 uSv
> >
> >     These values assume state-of-the-art technology: fast screen/film,
> >     full collimation and filtration, etc.
> >
> >     For details see White SC, Dentomaxillofacial Radiology 21:118, 1992.
> >
> >    ======================================================================
> >     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
> >     ======================================================================
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