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A Is it possible to see newton rings in CT (xray) images?

  1. May 11, 2016 #1
    I have seen what looks like newtons rings interference pattern in transverse CT images of 2 solid water block on
    top of each other. My understanding is that newtons rings occur in visible light eg photography or scanners. Can anyone shed some light on this? :)
     
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  3. May 11, 2016 #2

    Simon Bridge

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    It is certainly possible for Newton's rings to form from any kind of light - including x-rays. The trick it to work out what sort of lens to use to demonstrate this.
    You get the rings from light passing through a spherical lens on a reflective plane surface ... would the geometry of the "two blocks of water" be consistent with this?

    We need more information to work out what is causing the pattern you see - there are lots of possible causes of ripple effects in an image.
    You may like to look at:
    http://www.x-ray-optics.de/index.php?option=com_content&view=article&id=55&Itemid=63&lang=en [Broken]
     
    Last edited by a moderator: May 7, 2017
  4. May 11, 2016 #3

    Andy Resnick

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    If I understand you correctly, those are artifacts produced by breathing (motion) during a scan:
    http://images.radiopaedia.org/images/3234993/142d6c6760890cec00173fad02b622_gallery.png
    http://images.radiopaedia.org/images/6109236/da8a628b604924c56bb5a7b2ba84d8_big_gallery.JPG

    If I am misunderstanding, can you post/link to an image?
     
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