Author Topic: Looking for bench-top X-Ray machine!  (Read 6239 times)

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Offline Hugoneus

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Looking for bench-top X-Ray machine!
« on: May 16, 2017, 04:08:10 am »
I have been searching for a bench-top X-ray machine for a while now with no luck. Any suggestions? It would be very helpful in my videos.

Cheers,
Shahriar Shahramian
The Signal Path Video Blog
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Offline tautech

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Re: Looking for bench-top X-Ray machine!
« Reply #1 on: May 16, 2017, 04:22:07 am »
Member Fraser is our X-Ray expert.
Hunt through his Topics.
https://www.eevblog.com/forum/profile/?u=2435
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Offline james_s

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Re: Looking for bench-top X-Ray machine!
« Reply #2 on: May 16, 2017, 04:47:26 am »
A dental head works reasonably well for this sort of thing, they're compact and well shielded. Not very powerful but they do have a nice small focal point and when you're imaging inanimate objects that don't move or suffer from radiation exposure it's not a problem to take relatively long exposures. Ideally you want the whole machine so you don't have to mess with driving it.

You'll need a cassette and film too, mammography film and cassettes has a single sided emulsion which trades sensitivity for high resolution. Radiography film can be developed with ordinary photographic chemicals.

The biggest issue is regulatory, I don't know if there's a legal way to operate one in your home and I'm not going to offer advice on that topic other than be careful. Xrays are potentially dangerous and even a small dental system is capable of causing serious injury or death if you are careless or negligent enough and if you somehow manage to expose anyone to radiation it leaves the door wide open for serious liability. Nothing stirs up hysteria like the word "radiation." A commercially built fully enclosed and interlocked parcel inspection system is probably the best approach if you can find one.
 

Online TheSteve

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Re: Looking for bench-top X-Ray machine!
« Reply #3 on: May 16, 2017, 04:57:57 am »
Perhaps a mailroom X-ray unit such as Mike detailed here:
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Online BU508A

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Re: Looking for bench-top X-Ray machine!
« Reply #4 on: May 16, 2017, 07:28:30 am »
If you are considering to build an X-Ray bench machine by yourself, this may be a good starting point:

http://www.ebay.de/itm/Miniature-X-Ray-tube-for-x-ray-photography-and-research-Cold-cathode-Rare/252679396257

http://www.ebay.de/itm/X-ray-Image-Intensifier-Screen-for-experiments-with-x-ray-tube-x-ray-photografy/261604110323

But! Be careful! X-Rays are nothing to play easily with! Do all experiments with the radiation well shielded! Behind thick layers of lead!
“Chaos is found in greatest abundance wherever order is being sought. It always defeats order, because it is better organized.”            - Terry Pratchett -
 

Offline KE5FX

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Re: Looking for bench-top X-Ray machine!
« Reply #5 on: May 16, 2017, 07:55:54 am »
Look for a Faxitron MX-20 with the PC and software.  Nothing you build with a dental tube or mail scanner is going to have decent resolution. 

The Faxitron is almost more like an X-ray microscope.
 
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Offline james_s

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Re: Looking for bench-top X-Ray machine!
« Reply #6 on: May 16, 2017, 04:17:26 pm »
On the contrary, a dental head with mammo film can produce stunning resolution, as in you can clearly see the bonding wires inside SC70 and similar parts. Nothing accessible to the hobbyist rivals the resolution of mammography or single sided industrial radiography film. The focal spot is very small since they are normally used with a very short distance. At a longer distance capable of covering a larger sized cassette you will need exposure times of a second or longer but that is not a problem for inanimate objects.

You do need to take care not to overheat the tube though. There is typically no way to directly monitor the anode temperature.
 

Offline CatalinaWOW

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Re: Looking for bench-top X-Ray machine!
« Reply #7 on: May 16, 2017, 04:25:14 pm »
Here in the US the rules vary by state, but almost all require a licensed X-ray technician to be able to buy X-ray equipment.  Sellers at public sites like Ebay are pretty scrupulous about license verification even if it isn't required at your location.  It is easier for them to say no than it is to become conversant in all of the variations in rules and regulations.

Licensing isn't impossible, particularly for non-medical licenses, but in my location it is a significant and ongoing nuisance that I have chosen not to deal with.

Whether you decide to go legal, or find some way to skirt the law be careful.  You don't want to emulate Madam Curie and other earlier investigators in high energy radiation by dying of your curiosity.
 

Offline james_s

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Re: Looking for bench-top X-Ray machine!
« Reply #8 on: May 16, 2017, 04:37:50 pm »
I've bought at least half a dozen xray heads and tubes from ebay sellers and have never once been asked to provide any sort of license. You can buy pretty much anything you want, possession is perfectly legal. Now if you want to operate it that's another matter, I no longer mess with that stuff at home since I have access to a proper machine in an actual legal installation. I did acquire that machine myself though, no license, I simply had to sign a waiver and haul it away for free. The clinic was going to have to pay $600 to have it removed and disposed of. I repaired it and traded it to the current owner.
 

Online Fraser

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Re: Looking for bench-top X-Ray machine!
« Reply #9 on: May 16, 2017, 05:47:01 pm »
I recently configured and tested a Faxitron DX-50 high resolution table top X-Ray machine. It has the large 120mm x 120mm Hamamatsu imaging array and 35KVp available to the Microfocus X-Ray tube. The PC I configured for it is a MSI Hetis that has plenty of pprocessing power for teh task. The DX-50 is controlled using a RS232 serial link and the camera is USB linked. A laptop can replace the PC if desired. Pictures taken during my testing are in my X-Ray images thread.

https://www.eevblog.com/forum/projects/the-x-ray-image-thread-by-aurora-various-electronics-via-x-ray-imaging/msg1161087/#msg1161087

If he has not already sold it, the owner may be contacted here:


Howard Furr-Barton
Medtech-Supplies
The Rectory
Park Lane
Blunham
Bedfordshire
MK44 3NJ
United Kingdom

info@medtech-supplies.com

He deals in Medical surplus and is an experienced international shipper of large and/or fragile equipment.

Tell Howard I sent you and you may get a better deal. Present price is around £2500 for such a machine. It is a turn key solution with all configuration done and the unit tested for correct operation.

Fraser
« Last Edit: May 16, 2017, 05:51:35 pm by Fraser »
 

Offline KE5FX

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Re: Looking for bench-top X-Ray machine!
« Reply #10 on: May 16, 2017, 09:01:16 pm »
On the contrary, a dental head with mammo film can produce stunning resolution, as in you can clearly see the bonding wires inside SC70 and similar parts. Nothing accessible to the hobbyist rivals the resolution of mammography or single sided industrial radiography film. The focal spot is very small since they are normally used with a very short distance. At a longer distance capable of covering a larger sized cassette you will need exposure times of a second or longer but that is not a problem for inanimate objects.

You do need to take care not to overheat the tube though. There is typically no way to directly monitor the anode temperature.

Resolution isn't just a property of the sensor, but of the tube itself.  While the Faxitron doesn't have much penetrating power, you can get up to 5x magnification by placing the sample closer to the source.  That's the part that's hard to achieve without a microfocus tube, and from what I've seen, dental X-ray machines don't use microfocus tubes.

My favorite Faxitron shot so far is this one, of a 5x7 mm IC package.  The combination of 5x magnification and high pixel density at the CMOS sensor really gives you a good idea of what's inside:



A dental X-ray looks more like a 1:1 scale image due to the lack of magnification and low pixel density:



Yes, under the right conditions you could sort of make out bond wires, and I didn't mean to sound like the stereotypical EEVBlog "oscilloscope snob." :)  I would have been very happy with a dental system if I hadn't learned about the Faxitron on here.  But at the end of the day neither a dental-grade tube nor a dental-grade sensor is ideal for revealing high-resolution detail.  You might achieve comparable results with a dental tube and a high-end sensor, but the Faxitron's turnkey nature is really nice.  No hacking and mixing/matching of components is needed if you get the PC with it.

From what I've seen of Shahriar's interests, he would be best served with a plug-and-play specimen cabinet machine, or one like the benchtop unit in Fraser's post. 
« Last Edit: May 16, 2017, 09:17:01 pm by KE5FX »
 

Offline james_s

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Re: Looking for bench-top X-Ray machine!
« Reply #11 on: May 16, 2017, 10:16:04 pm »
Yes that is impressive, if you can find one then a machine like that has definite advantages. I found that I could achieve magnification by placing the film further from the subject but in practice I rarely did that.

Here are a few sample images that were taken with a dental head back when that was all I had access to, on a mixture of mammo, general diagnostic and industrial film. It's probably not as good as you might get from one of those Faxitron machines but I still think it's pretty impressive for $250 investment in equipment and supplies. The limiting factor is the scanner I used to digitize the film, a digital sensor is my holy grail for this stuff.
« Last Edit: May 16, 2017, 10:18:09 pm by james_s »
 

Offline KE5FX

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Re: Looking for bench-top X-Ray machine!
« Reply #12 on: May 16, 2017, 11:14:53 pm »
Quote from: james_s
Here are a few sample images that were taken with a dental head back when that was all I had access to, on a mixture of mammo, general diagnostic and industrial film. It's probably not as good as you might get from one of those Faxitron machines but I still think it's pretty impressive for $250 investment in equipment and supplies. The limiting factor is the scanner I used to digitize the film, a digital sensor is my holy grail for this stuff.

Those do look great.  Your exposures are on the order of 1 second?
 

Offline james_s

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Re: Looking for bench-top X-Ray machine!
« Reply #13 on: May 16, 2017, 11:24:34 pm »
Something like that. Those were all done around 8 years ago so I'm a little fuzzy on the details. Once I got access to a proper machine in a sanctioned location I stopped messing with the little heads.
 

Offline edy

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Re: Looking for bench-top X-Ray machine!
« Reply #14 on: May 17, 2017, 02:28:40 pm »
I have access to a dental xray head and digital sensor (CCD wired in directly to the computer which displays image almost instantly without need for chemicals or scanning). The only problem is the size of the field is quite small, as the digital sensors I have are usually Type #1 and #2 which are the size for intra-oral dental radiography. The biggest one is maybe 40mm diagonal, so it is really only useful for small devices or taking small fields.

I can take a bunch of xrays of various things I have laying around and upload them here, see if they are any good. The main problem with making your own device is the need to purchase an Xray head and hopefully a functioning tube in case it is old or not working. Regulations may restrict who can buy these. Also, if you are looking at wet chemistry you will need film and usually they come with lead shielding which you have to dispose of, plus all the chemical baths and you will either have to manually develop or get another machine which auto-develops, and they are not cheap.

Using a phosphor-plate system will cost even more, the film is re-usable but then you need a scanner which is also not cheap. Finally, a digital CCD type wired sensor is going to cost a fortune. So your best bet is if you have access or make friends with a dentist or doctor or radiologist, go to their clinic and use their equipment.

How would you do it? I can't see any easy and cheap way here in Canada to acquire the equipment needed to be self-sufficient taking xrays and getting images processed. If I did, I'd have bought my stuff through these ways rather than the oligopoly of dental supply companies here in Canada and need to get approval through Health Canada regulations.

I'll post some photos and xrays soon so you can get an idea of the quality possible. My stuff is about 8 years old now so it isn't the best sensor out there.
« Last Edit: May 17, 2017, 02:32:09 pm by edy »
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Offline james_s

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Re: Looking for bench-top X-Ray machine!
« Reply #15 on: May 17, 2017, 03:54:58 pm »
You can buy the heads on ebay, like I said, I've bought at least half a dozen dental heads and other tubes from ebay sellers and nobody has ever asked for any sort of certification. As far as anyone is concerned, I'm buying parts, not complete machines, and they're for collecting, not operating. Same with film cassettes and film. Not sure what you mean about having to dispose of lead, the film just comes in cardboard boxes with a light-proof plastic envelope inside. To develop it you need ordinary photographic film developer and fixer, I bought that from a photographic supply place called Adorama. You can get developing trays but they were a bit too small so I got a couple of plastic storage bins at Target that I use as developing trays. For the safelight I used a small red LED bulb in one of those socket adapters that plugs into the wall. I never worried about precise developer mixture and temperature, I just watch under the safelight while agitating the tray. It takes about 10 minutes to set up the darkroom, a minute or two to develop each film, then hang them up on clips to dry for a half hour or so before handling.

Are the rules different in Canada than in the US? I was offered an xray machine some years ago from a vet clinic in Canada but I didn't want to try hauling it back across the border. You might check ebay for items already in Canada, film for example, I bought a lot of it as expired stock which was cheap. I bet if you ask around at hospitals and vet clinics you can find some expired film, speaking from experience it works just fine, even expired years ago. I use my own film when using the big machine at my friend's business and I'm still using the film I bought back when I started doing this stuff.
 

Offline edy

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Re: Looking for bench-top X-Ray machine!
« Reply #16 on: May 17, 2017, 04:32:25 pm »
I've attached some xrays I took today of my patient "John Doe" ;) and  will explain what everything is.

000 - Dual USB charger pack
001 - Ethernet cable and an old style 30-pin iPhone cable
002 - iPhone 5C (plastic case) lightning port area
003 - iPhone 4S (metal cased) old style 30-pin iPhone port area
004 - Casio W-96H digital watch

These were taken with phosphor plates... Not the digital sensor. And subsequently scanned into the system. There was no change in contrast/balance/intensity done... Just straight off using dental settings. Took about 3 minutes to do.
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Offline edy

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Re: Looking for bench-top X-Ray machine!
« Reply #17 on: May 17, 2017, 04:34:21 pm »
Last image... sorry was over 2MB max attachment to a post.
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Offline CatalinaWOW

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Re: Looking for bench-top X-Ray machine!
« Reply #18 on: May 17, 2017, 06:13:51 pm »
James_s, maybe your state is one of the lenient ones.  It is regulated at the state level here.  I checked Ebay again after your earlier post and the vendors I checked had a note at the bottom saying they would require evidence of licensing in states and countries that required it.  I haven't actually tried to buy anything to see if they mean it, but my state is one that does restrict things.

edy - the small electronic heads might not be too big an issue if you use one of the programs that stitches images together automatically.  Some of the fancy dental machines have that feature built in, generating a strip covering the whole mouth in one image from all of those bite plate images.  Two free ones are autostitch and hugein.  I use autostitch and find it pretty easy although it is not a user friendly program.  Many swear by hugein, but I haven't broken the code to get useful results from it.
 

Offline james_s

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Re: Looking for bench-top X-Ray machine!
« Reply #19 on: May 17, 2017, 08:26:49 pm »
Oh the auctions all say that, it's a liability thing to cover the seller's butt, I'd bet money they never actually check with anyone.


The same is true for refrigeration supplies, once I took the trouble to get certified nobody has ever actually asked me for my refrigeration tech license.
« Last Edit: May 17, 2017, 08:30:52 pm by james_s »
 

Offline CatalinaWOW

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Re: Looking for bench-top X-Ray machine!
« Reply #20 on: May 18, 2017, 01:22:17 am »
As I said, it may be a state based thing.  I don't have a refrigeration license, and have been stopped from buying supplies.  So they do check, at least in some places.
 

Offline Hugoneus

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Re: Looking for bench-top X-Ray machine!
« Reply #21 on: May 30, 2017, 08:36:50 pm »
Thank you all. I will dig through your answers.
Shahriar Shahramian
The Signal Path Video Blog
www.TheSignalPath.com
 

Offline schmitt trigger

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Re: Looking for bench-top X-Ray machine!
« Reply #22 on: May 30, 2017, 09:07:27 pm »
James_S:
very nice radiographies.

I particularly like the one with the box of light bulbs....pretty artistic.
 

Online aargee

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Re: Looking for bench-top X-Ray machine!
« Reply #23 on: May 31, 2017, 01:32:34 am »
I really envy you guys that have unregulated X-Ray ownership.

Here to even buy one, broken or not, requires a radiation license. Used XRay gear goes to E-Waste or most likely landfill on a destruction order.
Not easy, not hard, just need to be incentivised.
 

Offline KE5FX

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Re: Looking for bench-top X-Ray machine!
« Reply #24 on: May 31, 2017, 03:08:18 am »
I really envy you guys that have unregulated X-Ray ownership.

Here to even buy one, broken or not, requires a radiation license. Used XRay gear goes to E-Waste or most likely landfill on a destruction order.

First they came for your guns, but nobody said anything, because you're not a bunch of violent American cowboys.

Then they came for your X-ray machines, but nobody said anything, because, hey, X-ray machines are dangerous.

Then they came for your blue-ringed octopuses, your Irukandji jellyfish, and your funnel-web spiders, but.... nope, you can keep those.  :-DD
 
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