How Do X-Rays Become Visible on Medical Imaging?

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Discussion Overview

The discussion revolves around the visibility of X-rays in medical imaging, exploring how X-rays can be made visible and their applications, particularly in medicine and industry. Participants inquire about the mechanisms behind X-ray generation and the principles that allow X-rays to create images of internal structures in the body.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant seeks specific information on how to make X-rays visible, mentioning the role of atomic numbers.
  • Another participant questions the relevance of atomic numbers to the visibility of X-rays, asking for clarification.
  • Some participants propose using scintillators and fluoroscopy as methods to visualize X-rays.
  • It is suggested that X-rays can be recorded on photosensitive film, which is a common method in medical imaging.
  • One participant mentions that accelerating away from the X-ray source at a significant fraction of the speed of light could make X-rays visible to the naked eye.
  • A link to a simple website explaining two methods of creating X-rays is shared, along with a discussion on their medical applications, particularly in diagnosing bone fractures.
  • A participant describes their professional experience with X-ray tubes and the use of different radiation sources, emphasizing the importance of sensitivity and contrast in imaging.
  • Another participant asks for a more scientific explanation of how X-rays create images on screens or film, beyond the basic idea of absorption by bones.
  • One response likens the imaging process to a shadow, explaining that denser tissues block more X-rays, resulting in varying exposures on photographic film.
  • A participant mentions the use of X-rays to recover text from old documents, noting that the ink fluoresces due to iron content.

Areas of Agreement / Disagreement

Participants express various methods and principles related to X-ray visibility and imaging, but there is no consensus on the specifics of how atomic numbers relate to visibility or the best methods for creating X-rays. The discussion remains unresolved with multiple competing views and approaches presented.

Contextual Notes

Some claims about the visibility of X-rays and their applications depend on specific conditions and definitions that are not fully explored in the discussion. The relationship between atomic numbers and X-ray visibility is also not clarified, leaving room for further investigation.

Stylewriter
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Hey!
Of course you can help me! :) I need some information about HOW TO MAKE X-RAY VISIBLE. I know that it depends on the atomic number, but I need it more specific, do you know where I can get some information about my problem?
I don't want you to write an essay for me, but I really need some help, where I can find some useful texts!
Thank you very much :)
 
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er..what?

What do X-rays have to do with atomic numbers?

Could you be a bit clearer in your meaning?
 
One way is with a scintillator. Here's an interesting thread on the subject.
 
Fluoroscopy

Not sure what you're looking for, but do a Google on "Fluoroscopy". You'll find plenty of info on that technique which allows one to view x-rays by having them hit a fluorescent screen.
 
Another way is by letting the X-rays fall onto a photosensitive film, before developing and fixing the film. This is how medical X-rays are taken.
 
You can accelerate away from the x-ray source. At some appreciable fraction of C, the X-rays will begin to be visible to the unaided eye.

...
 
wow, thank you very much for so many replies!
know I've got enough to read ;)

some more questions I've got, which need to be explained in a very easy way:
- How can you "create" x-rays?
- and what can you do with it...

it would be great if i get as much replies as yesterday :)
thanks a lot!
 
http://www.colorado.edu/physics/2000/xray/making_xrays.html a lovely simple website which tells you 2 ways of making X-rays, in an extremely simple way! I'm sure someone will expand on this if it's too simplistic for you.

Anyway, on to uses. As you probably know, a common use for X-rays is in medicine, especially when diagnosing broken and fractured bones. The X-rays penetrate right through the softer tissue, but are partially blocked by denser tissue, so leave a 'shadow', which is recorded on photographic film.

A very similar technique can be used in industry to detect faults in welds on pressure vessels like aeroplanes and pipelines.
 
Last edited by a moderator:
hey!
thank you very much! this website is great!
 
  • #10
GENIERE said:
You can accelerate away from the x-ray source. At some appreciable fraction of C, the X-rays will begin to be visible to the unaided eye.

...


What a great method!
 
  • #11
A very similar technique can be used in industry to detect faults in welds on pressure vessels like aeroplanes and pipelines.

I actually do this for a living! We have X-Ray tubes, internal "crawling" tubes although I normally use Gamma sources such as Ir92, and Co60...just depends on the "quality" of the radiation suitable for the job.

99% of the time we use film from Kodak,Fuji etc etc. but as mentioned there is flouroscopy for real-time viewing. There are also some fluorescing salt screens, but I have'nt had any exposure to them. Once again, it all depends on the sensitivity,contrast etc. required when you choose your medium.
 
  • #12
It's me again :smile:
I've got another question to the x-rays:

Why do we see something on a screen or an a picture or ... if the doctor x-rays e.g. my hand? Is there a more scientific answer than that the x-ray gets absorbed by my bones and there the picture stays white?

Thanks for your effort! :smile:
 
  • #13
I was just reading that they were recoverign the text of some old documents by irradiating them with x-rays. The ink used for the original set of documents would flouresce because it contained iron. I don't know the specific wavelength or any of the details.

These are the sole surviving copies of some of Archimedes work. Google could probably find more info.
 
  • #14
Stylewriter said:
Why do we see something on a screen or an a picture or ... if the doctor x-rays e.g. my hand? Is there a more scientific answer than that the x-ray gets absorbed by my bones and there the picture stays white?


Not really! Think of it as a shadow. The softer, more fleshy parts of your body allow more X-rays through, while your hard bones (and things like cartiledge and tumours) are denser, so let fewer X-rays penetrate. The areas on the photographic film which are more heavily exposed to X-rays turn black when developed.

This is the basic idea of it. If you want more scientific stuff, try researching X-ray absorption spectra of the human body.
 

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