Ultrasound and Magnetic Resonance Imaging - A Level Physics

A very simple and basic overview of two methods of indirect sensing used in medical diagnosis work.

[@DrPhysicsA]

The standard ultrasound image is 2D. But 3D scanning is possible. The sound waves are sent at different angles. The returning echoes result in a reconstructed three dimensional volume image in much the same way as a CT scan

[@DrPhysicsA]

Part of the reason is because it requires very precise engineering and part because the huge superconducting magnet has to be cooled by liquid helium

[@xiansmif]

Thank you ive used your videos from GCSE and im now a final year at university and still using them!!!

[@aalasabati5340]

Thank you Sir, your videos are helping me a lot. My physics A level exam is on the 19th of May.

[@DrPhysicsA]

Thanks. I hope the exam goes really well.

[@anaritamendes9529]

Aala Sabati perhaps it can help you... It helped me a lot. Hope that the exam goes well tou you =) www.imaios.com/br/e-Courses/e-MRI It's awesome the way that DrPhysicsA explains the issues. It seems so easy to understand. Congratilations!

[@aalasabati5340]

Rita Mendes Thanks :D

[@ikot21]

Gonna get that A!!

[@victorotene]

Hi, it's been two years so...What did you get?

[@GayKian]

Just started AS and trying to read around the subject, great video with a sufficient amount of information to give additional information not shown in the text book but not too much as to induce information overload. thank you for a fantastic lecture, #subscribed

[@addicted8494]

Your videos are AMAZING thankyou soo much!!!

[@jellyandme]

I can't thank you enough, that was an excellent video!

[@GaneshPramod]

Clear & concise. Very well explained. Thank you so much!

[@muhammadthaika6131]

another great video! thank you doctor

[@looee___]

You sir, are brilliant. Thank you so much for teaching me

[@anthonykairouz3693]

Excellent presentation!

[@fenghc1]

Excellent explanation!

[@lueasyable]

This really helped ! Thank you so much !

[@avibank]

This is great! thank you

[@amnamazharr]

Great explanation!!

[@Nishchalab]

A level physics tomorrow; revising everything with your videos! Thank you so much! :)

[@DrPhysicsA]

All good wishes for the exam.

[@Nishchalab]

Thank you! It went well- thank you so much for all your efforts.

[@muhammadsafwan2707]

it was really useful Dr. Hope to see your vids more

[@Bahar1370]

wow this lecture is great thanksss

[@vanhoot2234]

so fascinating

[@Furyflow]

Thanks a lot for putting these two (and in the other video more) techniques into perspective. I personally would wish a little more information about differences of T1/T2 and the role of water with these two techniques. But nevertheless thank you very much for your work

[@AnalKumar02]

Thank you very much sir.

[@223becca]

thanks, have a test tomorrow and u saved me!! haha

[@1995a1995z]

Thanks a lot!

[@mahmoudelsadany1122]

thank you so much

[@MrNari13]

Can you please explain A-scan and B-scan in ultrasounds?

[@aki957]

thanks a lot

Very good video! Is there any reason for silver specifically?

[@msn00000]

brilliant

[@xyz39r1abc]

Dr how is the crystals made to resonate ? Is it by passing an alternating current of the same frequency as the natural frequency of the crystal ?

[@amos5597]

Thank you so much sir :)

[@riteshbehera9606]

Amos Goh Ziyan xxxbidio

[@hridaymehta5782]

What is the function of non-uniform magnetic field, superimposed on the large constant magnetic field, in diagnosis using NMRI ?

[@aceacetamide206]

The videos helped me a lot ! Thank you sir ! By the way is there any video of you mention the A scan and B scan of ultrasound display techniques ? My syllabus contains them and I really don't know what to do about them.

[@alevelsdemystified3410]

Couldnt quite understand why the intensities of the 2 transmitted waves needed to be comparable.Awesome video tho!

[@NadinMagdy]

exam in 12 days, this is soo helpful! thank you :)

[@DrPhysicsA]

Hope it went well.

[@NadinMagdy]

DrPhysicsA it did go well thank you very much! A question about MRI came with 8 marks, and i was really thankful I watched your video!

[@drprocrastinate4719]

@@NadinMagdy 8 marks... which paper did you do?

[@cadenkai]

so did the center of (+) and (-) charges coincide?

[@TheW00tguy]

Hi i was just wondering. For the MRI scan to br applicable it only works for odd protons? I have heard of carbon-13 NMR but carbon has an even number of protons so does that mean its odd numbers of nucleons instead?

[@hridaymehta5782]

@@SaadCheplin Yeah but both of them have 6 protons

[@SwagFagGamer]

YOU ARE SERIOUSLY THE MAN SIR!!!! fk helped me alot!!!

[@zainabm9650]

can you please post a video on bridge rectifier??

[@etchpup0806]

An MRI question: isnt there going to be a force acting on the person if theres a current carrying coil ( to produce the radiowave) and a large magnetic field between the bed? ( According to left hand fleming's rule)

[@hassanalthaf8561]

Lynn zyy only if the current and magnetic field are perpendicular

[@Karoskai]

How comes, when the pulse of ultrasound passes through a tissue, that lies beneath another tissue relative to where the pulse came from, it doesn't get reflected back in a direction away from the emitter when it hits the boundary of the first tissue? I don't know if I'm explaining it too well :s

[@DrPhysicsA]

Karosaki Well some will. But if the emitter is vertically above the tissue then a lot of the waves will reflect directly back.

[@PranavManShrestha]

The attenuation coefficient is replaced by a absorption coeff in this illustration.

[@anikasanjana6912]

Can you please make such explanation videos for A level Chemistry application too?

[@S0vereigN97]

+Anika Sanjana hello modhu

[@anikasanjana6912]

Ridwan Rahik​ hello modhu junior ❤

[@johnpaul4301]

@@anikasanjana6912 gro pitin

[@yourfavouritescepticx8969]

Not to be be rude but it would be lovely if you could go into detail about the resonance frequency of the radio wave and how it effects the protons.

[@MetalAndor]

Why only odd number atoms can behave like magnets?

[@shockingvideos5225]

What is it lamoa, the frequency at 10:25?

[@rinaberman7686]

Animation Larmor. It refers to both a formula and a constant in said formula. The frequency of magnetic precession is equal to the strength of magnetic field in Tesla units times the constant 42.58 mHz per Tesla. (This makes no sense unless you look at the equation). Basically, frequency of precession = 42.58 mHz/Tesla X magnetic field strength, in units of Tesla. Here's my trusty friend Radiopaedia, which gave me a bit more information: xradiopaedia.org/articles/larmor-frequency

[@DrPhysicsA]

Animation Lamda doesn't appear at 10:25 but I am talking about the frequency of the EM wave being the same as the Lamor frequency.

[@alevelsdemystified3410]

What does x mean btw?

[@maha_13]

Thickness of material through which the wave is passing.

[@colossalko]

Why does the MRI machine cost ~1million USD?

[@MsDYap]

I think you mean 2 dimensional image for ultrasound????

[@joehillion]

I think you're wrong with the intensity formula (which has a exponential in it). Isnt that the equation for attenuation coefficient of collimated xrays

[@maneetabhandari1106]

9:20

[@TheAlinamalik]

MRI is not defined good need more

[@sankawijesinghe975]

Huththoooooooooo kari kari oi thadaaaaaaaa