[HN Gopher] Building a DIY CT/CAT scanner for $200 [video]
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       Building a DIY CT/CAT scanner for $200 [video]
        
       Author : walterbell
       Score  : 101 points
       Date   : 2024-01-28 03:03 UTC (19 hours ago)
        
 (HTM) web link (www.youtube.com)
 (TXT) w3m dump (www.youtube.com)
        
       | givinguflac wrote:
       | This strikes me as a way to give yourself cancer, no?
        
         | bazooka5798 wrote:
         | Only in California
        
       | jszymborski wrote:
       | Reminds when William Osman hacked a dentist's X-ray source
       | 
       | https://youtu.be/IiJAq53knwc
        
         | Fatnino wrote:
         | The vitriol he received from that video basically drove his
         | main channel into hibernation.
        
           | jszymborski wrote:
           | I know :( We're poorer everyday for it.
        
       | walterbell wrote:
       | From YT comments:                 ... this kid appears to know
       | what he's doing.  He even built a fairly outrageous DC power
       | supply specifically for this project.              ... It was
       | smart to use the remote control to keep away from the X-rays! ...
       | hence, why he was across the yard ... Protip man, build a little
       | lead or steel vault for that thing to protect yourself AND remove
       | background radiation that is noising up your image. Then get
       | yourself a survey meter and make sure you are keeping exposure
       | outside the vault to 5mr/Hr or less.            ... Excellent
       | work young man.  When I read the title of your video, I thought
       | perhaps you misunderstood the complex nature of the
       | reconstruction algorithm.  Turns out I was the one trying to keep
       | up with your explanations and logic.              ... I fix CT
       | scanners for a living.  This is pretty darn cool!!  When you
       | started out, I was trying to figure out how you were going to
       | make all of that rotate around your "patient."  You simply
       | rotated your "patient" itself.  Well done!              ... While
       | not medical grade, it still demonstrates the working principle
       | and actually extremely useful for imaging internal structures of
       | all sorts of things!
       | 
       | Consumer electronics imaged by industrial CT scanner:
       | https://www.lumafield.com/article/inspect-electronics-indust...
       | 
       | Precursor videos:
       | 
       |  _Building an X-Ray power supply_ ,
       | https://youtube.com/watch?v=ppIhQ0ZldZ0
       | 
       |  _Turning TV parts into an X-ray machine_ ,
       | https://youtube.com/watch?v=LXnK_lMQbYc
       | 
       |  _Building an X-Ray machine in my backyard_ ,
       | https://youtube.com/watch?v=oxfPK6PlyRY
        
         | zettabomb wrote:
         | >I fix CT scanners for a living. This is pretty darn cool!!
         | When you started out, I was trying to figure out how you were
         | going to make all of that rotate around your "patient." You
         | simply rotated your "patient" itself. Well done!
         | 
         | It's worth noting that this is in fact the approach for most
         | industrial CT scanners, which are perfectly capable of punching
         | through perhaps half an inch of steel in my experience (not a
         | CT tech, just an engineer that has used them - there might be
         | more powerful ones out there). It's usually just a small
         | turntable. Conveniently, the object to be imaged usually
         | doesn't care too much about the radiation when it's made of
         | metal.
        
       | fergbrain wrote:
       | Ben from Applied Science did this 11 years ago too:
       | https://youtu.be/hF3V-GHiJ78?si=I6xH7WrrqVaDK-Hv
        
       | doctoboggan wrote:
       | Pretty cool, although it seems like he is blasting his phone with
       | x-rays? I am guessing that thin phosphorescent screen isn't
       | blocking much.
        
         | jacquesm wrote:
         | As long as it works, it works. Interestingly the phone doesn't
         | glitch. I wonder how many x-ray equivalent doses the lighter,
         | the guy and his phone have picked up by now.
         | 
         | This is probably safe if you do it once but I'd definitely not
         | do this regularly.
        
           | Solvency wrote:
           | I'm now remembering The Knick when that guy gets cancer from
           | his obsession with the x-ray machine.
        
       | Prcmaker wrote:
       | That sound like a lot fun. Working on similar recently, I've
       | learned the basics are almost trivial with the information and
       | technology that is now widely availablr, and this really
       | demonstrates that.
        
       | qwezxcrty wrote:
       | I was planning to build something similar with a higher budget
       | for a Spellman HVPS, a shielded Oxford Xray tube, and a CMOS flat
       | panel detector.
       | 
       | However, I learned the potential law consequence of irradiating
       | my neighbors if they found out and that the Xray from the planned
       | 1mA, 50kVp system cannot be shielded to an absolutely safe value
       | easily. I decided to put the plan on a indefinite hold.
        
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       (page generated 2024-01-28 23:02 UTC)