[Oradlist] AC vs DC

[Allan G Farman]

In my tests with digital detectors I have found no disadvantages for AC
over DC. Both X-ray generator types generally provide excellent provided
that the system is not "worn out."  An inconsistent machine is
inconsistent whether AC or DC. AGF

Allan G. Farman, BDS, PhD, MBA, DSc, Diplomate ABOMR

Prof. Radiology & Imaging Science
Univ. Louisville School of Dentistry: SUHD
501 South Preston Street,
Louisville, Kentucky 40292, USA 

Tel: +1(502) 852.1241
Fax: +1(502)852.1626


>>> Andrés Briner <andresbriner at gmail.com> 10/15/2009 05:04 PM >>>
Dear Axel,

1.-  DC equipments produces more homogeneous X-ray photons in terms of
its
energy, since the potential difference is constant and high.

2.-  AC equipments deliver pulses of x-rays with periods of silence in
between them, so the total exposure time is at least the double, giving
more
possibility to have blurring due to sensor motion.

3.-  AC pulses are not compatible with the short exposure times needed
in
digital x-rays, so it is very easy to have under or over exposures.

4.-  Most of the AC equipment are old and they have a bigger focal spot
due
its use, and the higher temperatures they produce in the anode.

Kind Regards

Dr. Andres Briner
Imax Radiological Centers
Santiago
Chile

On Thu, Oct 15, 2009 at 4:41 PM, Ruprecht, Axel
<axel-ruprecht at uiowa.edu>wrote:

>  Hello
>
>
>
> I have had a question put to me by a former student about whether a
DC unit
> used with digital imaging produces better images than an AC unit. Do
any of
> you have any hands on experience in this regard, that you would be
willing
> to offer to me?
>
>
>
> Rgds
>
> Axel
>
>
>
> [image: Signature no AR]
>
>
>
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