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From: John Larkin on 15 Jan 2010 22:47 On Fri, 15 Jan 2010 17:58:38 -0800 (PST), RichD <r_delaney2001(a)yahoo.com> wrote: >is it possible to design a subcutaneous x ray? >A surgeon might want to see a depth just below >where he intends to cut. > >The point is, I thought only bones are opaque to x rays. CAT scans do just that... 2d cross-section images. http://en.wikipedia.org/wiki/Cat_scan http://en.wikipedia.org/wiki/File:Ct-workstation-neck.jpg John
From: Salmon Egg on 15 Jan 2010 22:54 In article <524e9de7-330d-40fd-90f5-0d671ec9ce7d(a)j19g2000yqk.googlegroups.com>, RichD <r_delaney2001(a)yahoo.com> wrote: > is it possible to design a subcutaneous x ray? > A surgeon might want to see a depth just below > where he intends to cut. > > The point is, I thought only bones are opaque to x rays. > > > -- > Rich X-ray absorption is approximately proportional to the square of the atomic number. There just is not much to be found under the skin near the Z = 20 of calcium. There is not enough potassium with Z=19. Iron in blood has Z = 28 but is only a small portion of hemoglobin. Iodine, often used as an x-ray contrast medium. is also scarcer in the body. Bill -- An old man would be better off never having been born.
From: a7yvm109gf5d1 on 15 Jan 2010 23:17 On Jan 15, 8:58 pm, RichD <r_delaney2...(a)yahoo.com> wrote: > is it possible to design a subcutaneous x ray? > A surgeon might want to see a depth just below > where he intends to cut. > > The point is, I thought only bones are opaque to x rays. > > -- > Rich http://www.baytoday.ca/content/news/details.asp?c=6657 The more I drink, the more plausible this article gets!
From: Joel Koltner on 15 Jan 2010 23:46 <a7yvm109gf5d1(a)netzero.com> wrote in message news:fb3a8b25-d988-4f2c-9b46-918116b75931(a)o35g2000vbl.googlegroups.com... > http://www.baytoday.ca/content/news/details.asp?c=6657 > The more I drink, the more plausible this article gets! Most people probably don't recall the discussion in physics class about how we humans see just a tiny portion of the EM spectrum and hence what's opaque in the visible light range can be anything but at other frequencies. (And as Joerg points out, there's also sound waves to consider for "probing" purposes.) That being said, it sounds like the Bay Today article is about a guy who likely is just playing with smoke and mirrors. There certainly are some cool systems out there to let one "see" through ordinary walls, but the ones I'm familiar with are still a ways from highly-detailed "X-ray vision" and cost a bundle besides. E.g., http://www.camcon.co.uk/prism_200.html This is a very cool coffee-table book on the topic: http://www.amazon.com/Alien-Vision-Exploring-Electromagnetic-Technology/dp/0819441422 ---Joel
From: Robert Baer on 16 Jan 2010 04:00
RichD wrote: > is it possible to design a subcutaneous x ray? > A surgeon might want to see a depth just below > where he intends to cut. > > The point is, I thought only bones are opaque to x rays. > > > -- > Rich One might try ultrasonics...ping and listen; build a picture and catch the fish. |