What Makes The Different Sounds In MRI Scans? (From Loud Knocking to Rhythmic Chirping)
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- Опубликовано: 24 июл 2022
- Why does an MRI make different noises? This video takes a rare look inside MRI scanners to show you what actually makes the different sounds during MRI scans. The sounds in MRI are produced by only 3 components in the MRI scan room: The coldhead, RF coil and gradient coil. Topics include chirping sound in MRI, what makes MRI scans so loud, why does an MRI make a loud knocking noise and more. Join us as we demystify MRI scan sounds. Thank you for watching!
Revision note: In this video, we used the term "sublimation" around timestamp 0:50 to describe the process of boil-off of liquid helium in MRI machines. However, it's important to clarify that a more accurate term for this phenomenon would be "expansion." Liquid helium doesn't undergo sublimation when transitioning to its gaseous state in this context. This correction ensures a more precise understanding of the process. Thank you to our community members for drawing attention to this correction.
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I hope this video was helpful! Listen to the sounds of an MRI scan filmed inside the scan room here: ruclips.net/video/TIsrOtSSUQY/видео.html
Why Is Metal Not Allowed In MRI Scan Rooms? Click here to watch: ruclips.net/video/ug3e9W5H0jI/видео.html
What Is MRI and How Does It Work?: ruclips.net/video/19qu6SYqOTc/видео.html
3:07 Why aren't the fiberglass mountings designed so the gradient coils don't knock against them?
Sorry, maybe that explanation would work for scientists and electrical engineers; but for us common lowlife slobs with other Masters degrees, that did not make any sense at all. Any way you can make a video without using technical jargon? Also, animation showing movement of internal parts as they make those sounds would be most helpful. Don't slow the sounds. We've all had to have MRIs at one point or another, so the sounds are very familiar. I've always wondered what makes the different sounds, and unfortunately after your video, I STILL DO!!!
I could fall asleep listening to that video of the sounds inside an MRI.
Having been in a MRI in 2015, I can say that, even with the proper hearing protection on, these things are loud.
Of course, because how much hearing protection you have on while going through it doesn't affect how much sound output they have.
I used non-ferric headphones and cranked up the music.
I had my my brain scanned (yes, presence of brain confirmed😇) about the same year. They said it would be loud but it turned out to not be bothersome.
It depends on the strength of primary field.
I had a head scan in 0.3T open scanner and while it was loud, I did easily it without hearing protection (it was available for patients).
It didn't deafen me afterwards, even temporarily.
@@ajdziaj Important point. All scans are not the same.
The best thing about MRI, CT and such imaging scanners is that almost no person must now hear the dreaded phrase "exploratory surgery."
I've had 3 in my life, and every time i walk in and hear the coldhead pumping im like "damn, that's a sick beat!"
Humor gets me through basically everything tbh
and I thought i was the only one who thought it was a rock band.
Just had one this morning and honestly I spent the 15 mins vibing and mixing the coldhead sound in my head 🤣
Yeah I close my eyes and start thinking of good trance choons....soon passes by.
Same, I always think it sounds like a Daft Punk B track haha!
I tried to get one done on Tues and 6 months ago ..no deal. Why is the noise so loud
Guys every time you get an MRI please make sure your ear protection is put on right, if you're mid-scan and you realize the sound is getting too loud( it is) stop the scan, and put them on right. Don't feel pressured by the technician or the machine, stop the scan, they should give you an emergency button to hold onto... press it! I was to scared to stop the machine and it only got louder and louder, my right ear was rigging and i got temporary damage, do not be afraid to stop the scan.
I wish I’d known that, my useles plug fell out. And they forgot the music having asked what I’d like to distract me…
I had an MRI and they never offered any hearing protection. And my insurance company decided to deny the MRI charge. I'll never go inside one again.
I was given the option to listen to music through one of those cheap over-the-ears foam headsets. I declined the music. Wasn't offered hearing protection. Permanent damage. Wish I had known how loud it would be
I've never had a problem with the ear plugs, but I did feel like I was going to throw up when the contrast started. I was seriously considering hitting the button.
Had 2 done.ok but loud ask for advanced mri
Respect great engineers that life wouldn't be possible without them.
*a better quality of…
@@randygreen007 sometimes it legitimately saves lives though...I suspect
How did you get to engineering first?
Physicists enter before engineers in this. Watch 'Big bang theory' always 😂😂
nah programmers try to come up with something that was engineered without the use of some form of computer or just anything engineered that doesn’t include some form of computer in the design
It's the sound of a large pump pulling money out of your bank account to pay the bill when done.
I have genetic desease , to keep monotorized and under controll i take 1 mri each two years for free (yes i live in EU).
That’s cause you’re living in a sick country
It's almost 2am and I can't sleep because I'm too fascinated with learning about MRI machines. I dunno how to feel about that but thank you for providing the info nonetheless lol
Hyperfixation vibes
@@peshisparkles1582 m o o d
lol same. 2:15 am here
Lol
Yep, that's why I'm here too
The first brain MRI I had, in 2008, was completely closed; it was like being in a space capsule. I had no idea what to expect. I'd describe that noise as the Pile Driver from hell.
Absolutely agreed with my GP's description of having a brain MRI:
"Like being buried in a coffin on a building site."
As someone with high anxiety which causes claustrophobia, I could only get two thirds of the way through, even with Valium on board. I don't think I could ever do it again, unless it was a much more open tube.
I've always fallen asleep in MRIs. The sounds aren't uncomfortably loud, really. They're rhythmic and hypnotic. Nothing to be afraid of.
I was a about to have a panic attack. I didnt realize i was claustrophobic
First time I was in one, for about 30 seconds, the electrically? operated bed couldn't get me out as I was jammed in the tube.
Due to claustrophobia they had to put me to sleep for the actual scan and30 years later I still remember waking up half way through it.
Not a pleasant experience for me but I remember the banging.
I always thought of it as a heavy metal rock band.
Just had one today and was surprised by the pumping sounds, had no idea it was pumping liquid helium 🤯
Me too
I had one today too. The brain in my case. The sound at 3:13 was sooo load and sounded very strange in my head.
Same - I had one today and here I am to figure out what all the noises were!
@@Ang417Liquid helium only exists within the magnet housing, it is never pumped. Helium gas is used as a refrigerant by the coldhead. It cools the shields within the housing and reduces liquid helium boiloff. The coldhead cannot turn helium gas into liquid, it just cools the housing, usually in at least 2 stages. Toshiba systems are much quieter due to the fact that the gradient coils are in a vacuum.
Call me crazy, but the sound experience of an MRI is so soothing.
I won't call you crazy for that reason but that naked sky diving at midnight has got to stop. It would be okay if you weren't doing it above the Catholic girls school but c'mon . . . 😉
You're not alone... I actually find it therapeutic.
@@jassenjj had my first one today and i fell asleep. I was snoring and had dreams that someone was knocking on my door. 🤣
🎉 yes
Crazy
Respect for great engineers..who have built this MRI machine..
The idea for the MRI, like cell phones, came from the Star Trek TV program back in the 1960s.
And the other MRI machines across the globe?
They can be scary at first but you get used to them. My first one I was really frightened at all the noise, but by the time I had a 5th one earlier this year I actually fell asleep in it lol
for anyone who is scared of them i'd say think of it as listening to a rock band.
Just today had my mri scan, the noices were crazy but looking back kinda cool and super loud!! But i got to watch a movie and we just got a call that my brain is healty and yheres no tumours (just migraine) so im happy! The banging and beeping inside the machine were kinda scary tho 😂
I'm glad I'm only watching this after the amazing MRI experience 💀45 minutes is hell trust me
00:55 Note: sublimation refers to a solid transforming directly into a gas, skipping the liquid phase, for example dry ice. A liquid transforming into a gas, such as helium in this instance, is referred to as boiling or evaporation (if this phase transformation occurs at a temperature below the boiling point, as we commonly see when a little water splashes on the countertop next to your sink). Great explanation of the racket produced by an MRI.
I had my first MRI many years ago when they were quite novel. As a farm boy I immediately recognized the sound as being a New Holland hay baler. Of course I also appreciated the idea of adaptive reuse of existing tech. Several years later I had another, and realized they had upgraded to a newer machine from John Deere. Of course tech progresses. My latest, just a couple of years ago, sounded like they had left the farm altogether and moved on to something that probably came from an automated brake drum grinding machine.
here for this! I love the noises it makes, I am that rare one that is obsessed with it lmao
I have Multiple Sclerosis and have to get them a couple of time a year. I am the same way! I find the noises to be relaxing.
@@Danielle_Renee1121 I suffer from EDS and hyperacusis and I unfortunately have to get MRIS on a reg it’s horrible for me even with double ear protection 😢
I love the sounds too I actually feel so relaxed when I’m getting one
i have fallen asleep in every mri i've had done. that rhythmic pulsing is just so soothing haha
During MRI, you have to stay still and not breath deeply. The more I tried not to laugh, the more I was about to ROFL. All the noises of the scanner reminded of ship engine room machinery. Diesel generator, starting air compressor, etc...
I remember absolutely JAMMING to the sounds when I first walked in to the mri room
I recall having my first and only MRI scan sometime in the early1990's in Pennsylvania. I recall the bang, bang, bang noise while the scan was ongoing but don't recall it being very loud with hearing protection on. I assume the MRI magnetic field power has increased since then.
What i find most fascinating about MRI's is that they dont pull themselved apart. I mean they produce eddycurrents strong enough to fling a chair through the room, yet the delicate electronics inside stay unharmed. I mean I'm certain they dont use non-magnetic wires and such, so that it doesnt literally eat itself is miraculous to me
I love the sounds of an mri. With the blindfold on, the noise and me relaxing i feel like im traveling though some worm hole in space. 😂
I like to imagine that i'm inside a techno concert with all those sounds going off around me :)
The lovely techs at "my" hospital have installed color LED lights in the MRI room 🎉 it's no Prodigy but I appreciate the gesture.
MRIs aren’t scary to me anymore but I always leave with a headache 😂
Same! I had my mri scan today because i suffer from severe migraines. I had the scan to make sure i dont have tumours in my brain. Before the scan, i took medicine so my migraine kinda went away for a while. After the scan it was back and i didn't know why. Glad to hear it happened to others too, so im not the only one😂❤
My head was hurting to lol I just did my scan
So different amounts of electricity flowing through the coils makes different noises? This vid was so interesting
I’ve had a couple MRI scans and fell asleep in the scanner. Thank you for the explanation.
I once got scolded to remain still because I was subconsciously dancing to the rhythms while being scanned.
When I had my first MRI, the sounds would have made for a nice and groovy industrial/techno beat. I was vibing in there and almost disappointed when it was over. 😅
Yes! I wish they'd give us a little beat machine to play with.
The noises are so loud and varied, you think somebody's goofing on you. I laughed.
I thought the technician was messing with me. "How long will he go in that noisy tube?" Ear plugs were never offered.
thanks for uploading this ! really informative
Glad it was helpful!
Because of major surgery I had several years ago I need check ups every other year that requires an MRI scan. On every occasion I’m always amazed at this magnificent machine.
They’re pretty cool, even though I hate being in them, they are really cool piece of technology!
Great video. Just a side note:
The human ear can hear frequencies between 20Hz and 20kHz. RF used in MRIs are in the MHz range, so the RF is not audible.
The noise we hear during scan are only from Gradient Coil vibration and the coldhead. MRI RF is not audible.
I'm thankful for the technology I just wish somebody would have mentioned the intense noise that you have to get through for 45 minutes. If you are someone that is sensory sensitive please let them know ahead of time
It just gives me chills just hearing the sounds
to say an MRI is "loud" is an understatement lol
I’ve had several mri of my head. The best way to describe it is, even with the headphones on, it’s like having someone operate a jackhammer in your brain.
I had a head scan for tinnitus it was the most frightening thing I have ever done. The banging noise a claustrophobia were unbelievable. Nobody told me what would happen but the ear plugs were ominous.
This really helped me calm down before my mri. Thanks
I'm kinda surprised I managed to sleep through my MRI scan.
I had a messed up sleep schedule where I went to sleep at around 6-7AM and woke up midday. The scan was at 9AM.
That day I just didn't go to sleep at all, and after the whole sleepless night managed to fall asleep 3 times during the 51 minutes long scan. To me it felt like barely 5 minutes passed lmao.
I do still remember those noises though, so it must have ingrained itself in my memory quite vividly.
My mom just got an MRI done a few days ago. I could hear the noises all the way out in a separate room I was waiting in. I could only imagine how loud it was for her even with the earplugs.
I came to this video to hear what spunds will i jear inside MR and how loud will they be. Great explanation. I just wish there were more actual sounds
Are there different cooling techniques for the cold head? I had an MRI recently and I didn't hear a number of these sounds, whereas I did with one I had ages ago.
Depends on the machine and what kind of scan you got.
Some manufacturers enclose the gradient coils in a vacuum chamber, which greatly reduces the noise they create during a scan. But this comes at a price as the coils can't be cooled as easily. Gradient coils are liquid cooled due to the immense amount of heat they generate during a scan. Old, old MRI magnets, and I mean OLD now, used a separate jacket of liquid nitrogen to insulate the helium vessel to reduce the amount of helium boil off. This necessitated a weekly fill of nitrogen to replenish it. The helium liquid would usually need to be filled approx every 3 weeks. This was in the days before the cold head technology came along. Naturally, those old magnets would not exhibit the pumping noise of a cold head because there wasn't one. Magnets with cold heads theoretically never need to be refilled as the helium boil off was constantly recycled back into the cryo vessel. HUGE amounts of cooling water is needed though to keep the cyro compressor happy otherwise it overheats and shuts down. When that happens helium boil off rates go through the roof. And that stuff ain't cheap.
I have had several MRI scans in my lifetime. My sincere advise is close your eyes to avoid claustrophobic reaction, and you will do find. They should tell everyone this!!!
I also found closing my eyes helped with the claustrophobia.
I had one in 88. As a large man, I gained a whole new appreciation for that feeling a turd has right before it sees daylight.
That just made me more scared of MRI machines...I never knew that.😱
Damn MRi systems are actually super loud!
It's even louder than what's shown in this video.
MRI is truly a speedcore/extratone/splittercore/flashcore generator. amazing technology.
Great video! Except the information regarding the RF coil, which is wrong. RF coils doesn’t make sounds at all in the scanner. Their frequency are in the MHz range, way above the human audible frequencies. So the gradient coil is the one that produces loud sounds, in the rage of kHz (human audible sounds)
I think they are funny sounding. It's hard for me not to laugh at all that racket! Thanks for the informative, entertaining video!
Today was my 3rd after a looong time. Now I know that "breathing" sound comes from the coldhead. It definitely helped me with keeping my own breathing even. :) I felt so safe in the machine, and I loved its sounds. Be it sick or not, lol.
I hope there is a 'full version' to listen to here on yt. (I'm not high or anything)
You are not alone. Being inside an MRI machine was one of the best experiences of my life
I’ve had so many I have to be careful I don’t fall asleep. Snoring apparently messes up the images. Haha. 😂
I delivery these along with other imaging systems for a living to hospitals and clinics, CT, X-RAY, AMX & Mammo units along with MRI. Neat stuff.
another question- is there different type of gradient coils? I know they all have XYZ but I have heard of saddle/ horse shoe shaped coils when asking about scanners to my hospital.
The gradient coils in an open MRI has a saddle/horseshoe configuration to accommodate a larger aperture. But i believe they may have been talking about the GE HNS (Head, neck, shoulder) Coil horseshoe accessory. It is shaped like a horseshoe and the patients head sits in the center of the horseshoe. The HNS coil acts like an antenna to improve return signal and helps to increase SNR. It can get confusing with so many components named coil eg. RF coil, gradient coil, brain coil, knee coil, etc. but they are all aptly named as these components contain large loops of copper wiring to help improve local signal. I hope this was helpful. Thank you for the great question!
Thanks for the video; now I know what I heard....before I fell asleep in a running MRI during a scan. When the radiologist called on the intercom to check on me (I was ill at the time), I didn't answer! Two more calls on the 'comm later and I startled awake, not realizing I had fallen asleep during the scan. The rad tech was a little concerned, but I told him I hadn't heard his first calls on the 'comm. When we finished, he pulled me out of the MRI and said he never had someone fall asleep during a scan.
On my first MRI, I asked the tech to stop hitting the machine with a baseball bat !
Some people are afraid of MRIs. Here's how I think of it (and maybe this can help some others?)
Every six months, I get to:
-Lay in a cold room for 45-60 mins
-Lay in this awesome tube that makes awesome noises
-I get to wear a warm blanket and wear those awesome grippy socks
And my personal experience as a pediatric patient:
-I get to watch a movie with these awesome goggles
-When I get contrast, they have numbing cream, so I don't even feel the needle!
Honestly, this all sounds pretty awesome, yeah?
In which city you did ur mri
@@user-bv5gv3ei2l Pittsburgh, PA. Of course, the last few items are because of my status as a pediatric patient, so it might not be the same as someone who is an adult.
A claustrophobic can't use a MRI
@@Radoslaw731 There are several options that help with it. Some doctors will prescribe valium to alleviate the stress before the procedure. Some healthcare systems provide the option of a sedated MRI. I know that in some places, there's even an option to do an upright MRI, though I don't know how well it works.
@@Radoslaw731 There are open room MRIs for people who are claustrophobic.
Is it normal to be able to feel it when the scans moves across you? I always have a weird feeling like slight internal vibrations moving through the area thats being scanned. I get 1 or 2 scans a year
I dunno you shoud ask the techs i;ve never had that feeling but have you ever had your hair stand on end when being in an electric field?
No never had that problem
@@sheilaolfieway1885
I had one some years ago. One of the most stress inducing procedures I bad. At the time I was coughing regularly. Knowing I could sit up or turn if I coughed made it worse.
I've had one recently and it was incredibly quiet, compared to what I remember from many years ago. It was so relaxing, I almost fell asleep during those 40 minutes. There was a distinct part of the scan that drew my attention though, when the entire machine started shaking around twice a second. It sounded like a really big element in the machine is moving around rapidly back and forth or something. Any idea what that is?
It’d be a lot more zen if I wasn’t being told to hold my breath over and over again. Last MRI I had was about 1.5 hours in the bore. Every itch comes out to torture you, arm is always sitting funny and starts to hurt, need to piss etc but thru it all I’m still as a mummy because I want the best possible result.
As for the shaking, prob a specific pattern of drive to the gradient coils. You’ve got 1-3 Tesla (1000-3000 gauss) electro magnet with these gradient field coils they drive that basically wobble the magnetic field of the electromagnet to make the hydrogen nuclei in the cells of your body spin this way or that and it takes a tremendous amount of current. The coils are well bonded to the housing but the forces are tremendous so they move around. The force is proportional to the magnitude of the current, the dimensions of the loop, and the intensity of the field.
literally just had an MRI scan done about 3 hours ago and it was exactly the same for me as what you described. Except that I was lying on my front so it wasn't that relaxing. But it was mostly quiet (relatively) except for a section at around the middle of the scan when it made very loud clicking / banging sounds, and it also started shaking and vibrating. Pretty interesting nonetheless
In the early days the MRI technicians called the coldhead the "the heart of the tin man." If the tin man's heart stopped beating it was a major repair.
I began working in MRI with the first commercially made unit. It was a TechniCare 0.15T. back then they were called NMRI. The "N" stood for nuclear.
Later on I did liquid cryogen transfers for helium and nitrogen before there were cold head technology.
your description doesn't do it justice. it's incredibly loud and sounds like being inside some alien reactor or something. i had my hand scanned for 20 minutes . it was very painful as they put my hand in a clamp that caused me great pain in the exact area that i was having the scan for. the noise was incredible. each scan lasted a few minutes and every one had a different sound. my earphones slipped off one ear because of the position i was in and i couldn't get them back on.
Thank you. That was a really good, to the point explanatory video.
I was lucky, I liked the noise in the MRI and it helped distract me from my claustrophobia.
I've had several MRI scans. It sounds like being close to a running large diesel engine. The first one I had, the technicians were still being trained so the scans were rather lengthy. I fell asleep during one of them and moved when I woke up so it had to be redone. I was in the machine for almost an hour. The last scan I had was for a shoulder problem and lasted under 10 minutes.
I am getting an MRI tomorrow and I was curious, thanks!
Thank you. I asked a few techs and they said they had no idea 😂
I had one today and I meant to watch this yesterday. Per tech I needed it. Thank you for the information.
I found the MRI noises quite relaxing and one time i fell asleep in an MRI ! I would love to have an MRI at home just to relax in it.
Danke für die Erklärung.
If I had known how interesting the sounds would be,
I would have audio-recorded my MRI.
Machine music!
nice video! thanks for uploading! I'd love to know from where an mri gets its electricity if it has no apparent plug
Great question! That would make a great video topic. The cables and plugs are hidden behind the covers. They are routed behind the MRI scanner to stay hidden during scan operations. Power and data cables connect to the equipment room via a specialized RF-shielded penetration panel. The primary magnetic field coils get their power during a magnet ramp up procedure. The high amperage current is sealed inside the magnet to produce a "permanent" magnet that is always on. That is an amazing procedure to see. I will have to shoot a video of the process during the next magnet ramp. Thank you for the question!
@@MRIPETCTSupportEngineer it’s because during the GE Signa Hero unveiling, i noticed the display went on during the presentation
Wow I hadn’t seen that video. GE definitely makes a great MRI. Thank you!
@@MRIPETCTSupportEngineer ruclips.net/video/B0pBvbg2b6k/видео.html
@@MRIPETCTSupportEngineer Yes please to a video of the magnet ramp up!
I actually had an brain scan that was scanned in Siemens magnetom avanto 1.5 t ngl it was so intense but after i saw this vid i realized i got instant relief
Wow, 4° above absolute zero! That must take some serious machinery to produce!
Hopefully someday advances in superconductors would make such a system unnecessary.
Even something that has superconductivity at 0°C would be a game changer as a cooling system similar to a refrigerator could be used.
You would be surprised by how simple it is. Genius, but simple. You will get 4K just by letting liquid helium evaporate at normal pressure (like you get 0°C by letting ice melt in water). To liquify the helium you need the cold head, which is mechanically very simple. (You saw it in the video. The explanation was not quite accurate though.) The people who figured it out for the first time were of course very smart.
Now, getting below 4K is much more challenging...
I should add that simple in theory does not mean simple in practice. Such systems are expensive to operate and maintain. They require a lot of energy, and you have to refill expensive helium if it leaks. Also, cryogenic temperatures are generally not prolonging the life of mechanical components...
Performing a cryo fill on a magnet is an adventure. Everything, and I mean, everything, gets very very cold. The magnet turret frosts over, first with water vapor, then frozen air. Liquid oxygen begins to drip off of the turret and associated plumbing and fall on the floor. It bounces off of the magnet side and stings your skin. Afterward the fill, things have to be warmed back up with a heat gun, which doesn't like being in an intense magnetic field. All kinds of fun to be had.
I get yearly scans. Its a great time for me to listen to music and to get a nap taken!
i've had an MRI a few times, and i find them oddly comfortable, even with my mild claustrophobia. i didn't know they used liquid helium the entire time; no wonder they are so expensive!
I had a MRI scan a few months back the noises didn't bother me. I was told to stay still. It's very hard to stay perfectly still for 10 minutes. After some minutes I started to count, by the end of the MRI scan I'd counted to 30 tens times. My brother suggested piping music into the headphones, but the problem with that, is if you hear some music you, especially you like, you tap you hands, fingers or feet.
Thanks for adding actual captions for the Deaf
More videos to need to do that every once in a while, I’ll go into my own channel and clean up captions
If you're a worried first-timer, here are some tips. It's my experience for brain MRIs. DON'T BE AFRAID, it's not that bad. If you are very nervous you can show up 30 minuted earlier and ask for something to calm down (in swiss hospitals). For me the worst part of getting my brain scan is the dye injection. Once I'm in, I do a mini-meditation: name 3 things your body feels (like your socks touching your feet, whatever is under your fingers,...), 4 things I hear, 5 things I can see. That's 5-10 minutes gone. Then another few minutes appreciating the fact that you get to be lazy and HAVE to do absolutely nothing and it's completely justified!
Boom, I'm half way there.
Then, rinse and repeat. Or plan my MRI reward. It's usually a good pastry and coffee. Pizza maybe? Anything, really. Got plenty of time to figure it out.
Making lists also helps. Top 10s for example. Until finally the tech announces the dye injection, which means there's only 10 minutes left!
You can do this! ❤✌️🖖
Had my first experience last week. Since I’m moderately deaf, the sounds were not that loud but the knocking and shaking vibrations bothered me more.
I got a mri scan when I was in middle school and it’s kind of cool that is why now I am taking imaging of medicine course in university.
How odd. I had an MRI earlier today. I spent the time in the machine trying to figure out what makes the loud knocking sounds and why they are different with each separate scan. The operations tech didn't have the slightest idea why. I said I'd look it up later on that night. Before I did any search involving anything on the subject, this video popped up in my feed. My cell was in my jacket at the bottom of a plastic bag in a locker in a different room from where I asked the question so...nope, not Big Brother listening in. And this video has never popped up before, otherwise I'd have watched it. Thank you...Internet?
If you have Google's location tracking switched on it probably detected that you were at a medical imaging location and used that as a factor when populating your youtube feed.
@@SiblingCreature That's a perfectly acceptable conclusion. Makes sense.
I have been head first in couple of these and always wondered why the trance party. Not saing that it is wrong, just wondering why. It is impressive that in 3 minutes and 34 seconds I got answers to all the questions that made me wonder!
My only MRI was searching for an abscess. I was told to stay very still, but then the table seemed to be vibrating my body at several low frequencies. Do you have a video on how and why the table in an MRI moves the way it does?
The table moves to center whatever is being imaged to the isocenter of the magnet. The vibration you feel is the radio-frequency pulse together with the inherent coils. It's pretty insane physics actually. I'm an MRI tech and when people ask how it works, we say magic because it's easier than to explain it. Lol
@@amandaeaster8205 Is there a circumstance when the table would jiggle as part of the scan, or as part of a program the machine runs? It didn't feel like force being applied to ME, it felt like the motion of table under me was moving in a deliberate and controlled way, and THAT was moving me.
idk if anyone else thinks this, but i think that the coldhead sounds exactly like one of those grocery store bread slicing machines
Thanks for explainig . Can you / anyone else do something about the noises? Did you mention the loud train-horn like torture device that goes on intermittently. What heck is that, some sort of warning ? Is it not possible to make magentic coils that work at liquid nitrogen temperature, so that one does not have to worry about condensing the gas.
Excellent! Thanks for this information!
There is a cryogenic pump cooling the magnets. That makes most of the noise, it's a helium displacement mechanism ususally driven from a synchronous motor. The motor makes a rythmic buzz and the displacement piston makes the helium expand acompanied by a hiss. If the helium compressor is nearby that makse makes the most racket!
Had my first MRI today. As an engineer, I had to know what was going on!
During the MRI, the titanium implant in my skull resonated like a drumskin, nearly sending me crazy. I didn't press the stop button because I didn't know what the consequences would be of an imcomplete scan. The neurologist later told me that what happened to me was totally unpredicted, and that, in future, relevant questions would be asked before scanning.
Wow I’m so sorry you had to go through that. I understand why it might have been unexpected. Thank you so much for sharing your experience. It’s experiences like these that get brushed under the rug or not reported but I strongly believe that listening to these experiences helps imaging professionals improve the imaging experience for all patients. Thanks again!
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_ABSOLUTELY_ ONE OF THE _TOP_ EDUCATIONAL VIDEOS _EVER_ SUGGESTED TO ME BY THE YT 'ALGORITHM'!!! I'VE WONDERED FOR MAYBE 40 _YEARS_ WHY THE HELL THESE THINGS ARE SOOO DAMN NOISY!!! _THANX_ _FOLKS!!!_ 🙂 🙂 🙂 🙂
I've had at least 25 MRIs over the last 13 years looking for lesions in my brain and spinal cord due to Multiple Sclerosis. The noise doesn't bother me, but the intravenous injection of contrast agents can be uncomfortable. At least when that happens I know we're nearly finished.
To me the feeling of contrast pouring into your veins is meh, I could get used to it. What I hate the most are the aftereffects, mainly the warmness in my stomach. I have to fight myself not to vomit lol.
Same here. They terrified me at first, the confinement and seemingly violent noises. My spasticity would ramp up in there from the stress and any movement at all in the mri isn’t helpful. I’m about 5 years diagnosed and probably a dozen MRI’s done so far and I actually really enjoy being in the machine now. The sounds are like some kind of techno jazz fusion, the last two I had I almost fell asleep.
All that worries me now is getting the results afterwards.
feels like I've peed myself
@@kuba4ful no it’s the feeling of urinating for me. No, I don’t like that.
@@tchevrier isn’t that the most uncomfortable disgusting feeling ever?
It's not the machine it's the patients knees knocking together. Lol
Had one a few months ago, they have improved them. I don't remember it being particularly loud.
When the doughnut MRI scans came out in 1984 it was cutting edge!
There’s be times when mri become completely silent, technologies and people are amazing
I have to regularly get MRI scans. My tech knows me and hooks me up with Tool to listen to over the headphones they supply. The chunking of the MRI kind of blends into the music.
only got an MRI scan done once, there was no hearing protection and the sounds weren't that loud. the knocking sound was obvious but the humming sounds were the loudest. and i don't remember hearing that pulsing compressor sound at all.
I'd like to learn more about why and what the pounding, thumping, repetitive pile driver-y sounds are. I liked but didn't really understand your quick survey description of how/why some sounds.
Unfortunately getting into magnetic fields and RF stuff gets really complicated really quickly.
I’d still watch though
I had a prostate MRI last week. The tech placed a flat plate across my lower abdomen/groin. I asked what it was and I was told it was to concentrate the radio waves for a better picture. What he didn't tell me was that my junk was about to get really warm, almost to the point of me hitting the emergency button. Every time I was about to hit it, they repositioned for more scan and the area cooled off enough for me to stay in the tube.
That sounds rather uncomfortable