1. 
   PA X-ray
   PA X-ray: An X-ray picture in which the beams pass from back-to-front (posteroanterior). As opposed to an AP (anteroposterior) film in which the rays pass through the body from front-to-back.
   Found op http://www.medterms.com/script/main/art.html?articlekey=4720
   
   
2. 
   pa X-ray
   An X-ray picture in which the beams pass from back-to-front (posteroanterior). As opposed to an ap (anteroposterior) film in which the rays pass through the body from front-to-back. ... (12 Dec 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?pa+X-ray
   
   
3. 
   panoramic X-ray
   <dentistry> An X-ray taken by a machine that rotates around your head to give the orthodontist a picture of your teeth, jaws and other important information. ... (08 Jan 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?panoramic+X-ray
   
   
4. 
   Panoramic X-ray
   This page is an archive of the discussion about the proposed deletion of the article below. This page is no longer live. Further comments should be made on the article`s talk page rather than here so that this page is preserved as an historic record. The result of the debate was - kept - SimonP 19:...
   Found op http://en.wikipedia.org/wiki/Panoramic_X-ray
   
   
5. 
   paraxial ray
   (from the article `optics`) ...heights (i.e., distances from the axis) and extrapolating from a graph connecting ray height with image position, it would be possible to infer ...
   Found op http://www.britannica.com/eb/a-z/p/18
   
   
6. 
   paraxial ray
   a light ray that is close to and nearly parallel with the fibre axis NOTE - For purposes of computation, the angle, ?, between the ray and the optical axis is small enough for sin ? or tan ? to be replaced by ? (radians).
   Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=731-03-69
   
   

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