Fluoroscope Measurements

[Chris Alston <alstonc@odrge.odr.georgetown.edu>]

>Content-Disposition: inline
>Date:         Fri, 21 Nov 1997 14:37:14 -0500
>Reply-To: Medical Physics Mailing List <MEDPHYS@LISTS.WAYNE.EDU>
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>From: Steve Cartwright <Steve_Cartwright@KETTHEALTH.COM>
>Subject:      Fluoroscope Measurements
>To: Multiple recipients of list MEDPHYS <MEDPHYS@LISTS.WAYNE.EDU>
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>"The books" tell us to measure the Input Phosphor Exposure Rate (or
>similarly-named quantities) on fluoroscopes.  The recommended method
>is to remove the grid, and make the measurement at the phosphor.  Is
>removing the grid really necessary?  It seems that what we're looking
>for is a value that stays constant under various conditions and
>doesn't depart too far from the value measured initially.  If this is
>so then as long as the measurements are always made with the grid in
>they will be just as valuable as with the grid out.
>
>My objection to removing the grid is purely practical.  I don't like
>to take apart anything more than I have to.  It takes time and risks
>damaging an expensive piece of equipment.  If I was mechanically
>inclined I wouldn't have become a physicist.  I would have done
>something practical and made money.
>