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MRI story

Discussion in 'Fred's House of Pancakes' started by qbee42, Apr 2, 2009.

  1. jayman

    jayman Senior Member

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    Yes, overall it's a GOOD thing to have an engineer be cynical and pessimistic
     
  2. KK6PD

    KK6PD _ . _ . / _ _ . _

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    Where do you think "F.U.B.A.R." AND S.N.A.F.U. came from!!!
     
  3. qbee42

    qbee42 My other car is a boat

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    By the time the Mod 5 and Mod 6 came out I was working for a company that made vibrational analysis equipment. FFTs again, but a different application. Gould had been sold to a Japanese company, and because of that the different divisions were all split up, making things a bit messy for awhile.

    I don't have a sense of humor. I have been programmed to simulate a sense of humor.

    I suggested an alternative to large bore magnets: Crisco. I thought we should ship each MRI system with a big tub of Crisco. You get a fat person in for a scan, you strip them naked and smear them with Crisco - problem solved.

    It *was* amusing. A whole class of female technicians and I had to entertain them for a week. Oh the sheer drudgery of working for a living.

    Another amusing thing you can do with an MRI magnet, although not as amusing as female techs, is to balance a large coin on edge. You give it a little push and it falls over slowly, just as if it were in a viscous fluid. The strong magnetic field induces eddy currents, which oppose the motion of the coin. It's pretty cool. I wouldn't try it with one of your Canadian "fake" coins. The magnet would rip it from your fingers and send it flying through the bore, only to nail you in the face when it came yo-yoing back.

    Yes, very new stuff. Sometimes these things move faster than expected, but this one is still a ways off.

    Tom
     
  4. dogfriend

    dogfriend Human - Animal Hybrid

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    Sure, you could get them in the MRI, but wouldn't it be tough to get them back out again? Would there be a suction force at the closed end of the tube?
     
  5. qbee42

    qbee42 My other car is a boat

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    Both ends are open, except for trim pieces. On the other hand, we could take a page out of the torpedo manual and pop them out with compressed air: "HssssssssPOP!...thud...ssssssssCRASH". The "sssssss" part is the sound of a greased naked fat body sliding over linoleum before crashing into the door at the entrance to the suite.

    Tom
     
  6. dogfriend

    dogfriend Human - Animal Hybrid

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    That would scare the crap out of anyone: You are waiting in the lobby and suddenly a greased fat person comes crashing through the doors directly at you. They should show the reaction on You Tube. :madgrin:
     
  7. qbee42

    qbee42 My other car is a boat

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    We had a similar experience one time, although I didn't see this one personally. I have told this story before, but it's worth repeating. MRI scanners use large gradient amplfiers. They are essentially high power stereo amplifiers. In fact, in the early days they were made for us by an audio amplifier company which I won't name, but they also made big PA systems. We pushed these amps pretty hard, and failures were not uncommon. At one clinical location, two of our technicians were working on a failed MRI unit. Patients were in the waiting room, unaware of the technical problem. The gradient amp in this system was a big rack mounted device, and the techs had it pulled out for testing. Whatever they did managed to overload it, and the amp burst into flames. As is usual in these situations, panic was the normal response. Not knowing what else to do, the two techs grabbed the smoking amplifier, ran through the waiting room, and tossed it out the door onto the sidewalk. I imagine that was very reassuring to the waiting patients.

    Tom
     
  8. FL_Prius_Driver

    FL_Prius_Driver Senior Member

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    OK, I have a true story that is close enough. On the sub, a particularly overlarge junior torpedoman was given the job of cleaning the torpedo room bilge. This required him to squeeze down between the piping to get the job done. One completed, it became very clear that he was not coming back up. He was a human check valve. All the excess weight shifted up to let him down, but on the way back up, the same excess weight only expanded his girth coming up.

    This was pondered for quite a while, till the Division Chief stated he had the answer and left the torpedo room. He returned with a fishing rod and a doughnut tied to the end and stated "We will fish him out". (Submariners heal wounds by rubbing salt into them.)

    Eventually, the only solution was to have him strip completely, grease him in Crisco (no kidding), and get the whole crew pushing every part up. Not a fun evolution for all involved, but better than the alternative.
     
  9. qbee42

    qbee42 My other car is a boat

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    This is a great story. I especially like the expression "human check valve". You could have just left him down there until he got skinny.

    Tom
     
  10. amm0bob

    amm0bob Permanently Junior...

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    Proof of alien abduction theory...

    They can't...

    It wasn't a nail... it was a metallic recorder used to transmit whatever he smelled to the mothership... it is one of the only ways that our alien overlords can determine when it will be the right time to invade.


    I'm surprised there isn't someone (obviously it would have to be an alien drone) trying hard to cover this thing up and bury it entirely...

    :D
     
  11. qbee42

    qbee42 My other car is a boat

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    Re: Proof of alien abduction theory...

    How do you suppose they inserted it? I mean, look, if they went through the usual route... :eek:

    Tom
     
  12. dogfriend

    dogfriend Human - Animal Hybrid

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    Re: Proof of alien abduction theory...


    That's why it took 30 years for it to come out the other end.
     
  13. amm0bob

    amm0bob Permanently Junior...

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    Re: Proof of alien abduction theory...


    Yes...

    I believe you are right... it was probably inserted in the usual manner... during the alien abduction examination and all...


    Kinda like that fella that was a lumberjack that was abducted and returned later...

    Except... he was naked... and he remembered how he was examined...

    Maybe it was a different alien mothership.
     
  14. jayman

    jayman Senior Member

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    Re: Proof of alien abduction theory...

    That was probably a consensual human-alien relationship. Though he probably didn't understand some of the more alien (HA!) courtship rituals, which is why it didn't work out

    Once you go Alien, you don't go back ...
     
  15. amm0bob

    amm0bob Permanently Junior...

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    Re: Proof of alien abduction theory...


    Soooo... like the lumberjack dude was dumped then Huh...


    Maybe this fella was too when he was a younger fella, and he is just in denial.
     
  16. jayman

    jayman Senior Member

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    FFT's, linear approximations ... it's all good. That is, all exciting and hair raising (Not that I know what *that* feels like anymore...).

    Good programming job. They even knew how to handle the hot restart groups

    The only wrinkle - smirk snicker - with that plan would be the obvious kinky folks lined up down the block, just waiting to get their "special" MRI.

    You wouldn't even need a real, expensive MRI machine. Just a facsimile, as long as you had the tub of Crisco

    Yeah poor fellow, I *really* feel sorry for you

    Yep, that is a neat science experiment. You could also use that parlor trick to scare zealot religious folks. "OOoooooohhh run! The Evil Spirits are about to emerge from the dastardly machine! Run!"

    Actually, that would be a damn good prank. Just make sure the victim has one of those hockey goalie masks on to deflect the coin from the soft tissues of his face

    Admit it, you *really* get off on that stuff, don't you? It's like when I receive my latest issue of Defense Electronics and I giggle and prance around like a little school girl
     
  17. jayman

    jayman Senior Member

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    I'm pretty sure I saw a really *bad* porn movie - back in the early 80's - with a plot just like that. It was SOOOOOOOO bad it was funny, even the parts that were supposed to be kinky
     
  18. jayman

    jayman Senior Member

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    Oh bunny, that is priceless

    If the techs had a sense of humor, while running with the flaming, smoking amp through the waiting room, they could have yelled out

    "Run! It's gonna blow!! Run for your lives!!"

    But seriously, have you ever managed to innocently make a piece of equipment burst into flames? I was testing a stationary radar system that had older AN/FPS-19, which was made by Raytheon. Quite the impressive vacuum tube gadget

    When I was working on it, that was the transition to the GE AN/FPS-117, a solid state system. The -19 was already pretty old when I got to it, at least as old as I was, maybe a few years older.

    I hadn't realized that the reason why it was acting up was due to rodents. Mice had gotten into the structure, and every time a mousey managed to make contact, it was instantly cooked, caused a glitch, then once the short cleared, it started working again. A nice intermittent glitch

    So with a few of my team members, I had the brilliant idea of just cranking it right up to either clear the fault, or make the borderline component finally quit. I wasn't looking forward to going out there and cleaning waveguides

    So the instant I cranked everything up, peak power around 140 KW which made the onsite generator struggle, my team dropped a large heavy box BOOM. This startled the mice in their warm nest, they scurried out across all the magnetron support equipment, and

    KABOOOM!!!

    Like the 4th of July inside there. Heavy smoke from the cooked magnetron, power supply racks, etc, filled the entire room. It also smelled of burnt fur and cooked meat

    From that day on, I had the nickname "Puff, the magic dragon"
     
  19. dogfriend

    dogfriend Human - Animal Hybrid

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    I hesitate to ask:

    What did the cover of that VHS tape look like?
     
  20. jayman

    jayman Senior Member

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    If I remember correctly, the cover had a guy with typical early 80's do, with a *very* serious look on his face. Not one of the known porn guys. The lady had this look of surprise, and her hand across her mouth, as if gasping in surprise

    Even the cover art made me giggle