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
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!
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
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
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.
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
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)
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?
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
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
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
Thank you Sir, your videos are helping me a lot.
My physics A level exam is on the 19th of May.
Thanks. I hope the exam goes really well.
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!
Rita Mendes Thanks :D
Gonna get that A!!
Hi, it's been two years so...What did you get?
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
Thank you ive used your videos from GCSE and im now a final year at university and still using them!!!
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
A level physics tomorrow; revising everything with your videos! Thank you so much! :)
All good wishes for the exam.
Thank you! It went well- thank you so much for all your efforts.
Clear & concise. Very well explained. Thank you so much!
Your videos are AMAZING thankyou soo much!!!
Can you please explain A-scan and B-scan in ultrasounds?
You sir, are brilliant. Thank you so much for teaching me
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 ?
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
I can't thank you enough, that was an excellent video!
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.
it was really useful Dr. Hope to see your vids more
Can you please make such explanation videos for A level Chemistry application too?
+Anika Sanjana hello modhu
Ridwan Rahik hello modhu junior ❤
@@anikasanjana6912 gro pitin
What is the function of non-uniform magnetic field,
superimposed on the large constant magnetic field, in diagnosis
using NMRI ?
Very good video! Is there any reason for silver specifically?
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.
The attenuation coefficient is replaced by a absorption coeff in this illustration.
Excellent presentation!
another great video! thank you doctor
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
Karosaki Well some will. But if the emitter is vertically above the tissue then a lot of the waves will reflect directly back.
so did the center of (+) and (-) charges coincide?
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)
Lynn zyy only if the current and magnetic field are perpendicular
Excellent explanation!
Couldnt quite understand why the intensities of the 2 transmitted waves needed to be comparable.Awesome video tho!
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?
@@SaadCheplin Yeah but both of them have 6 protons
What is it lamoa, the frequency at 10:25?
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
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.
can you please post a video on bridge rectifier??
This really helped ! Thank you so much !
Great explanation!!
thanks, have a test tomorrow and u saved me!! haha
Why only odd number atoms can behave like magnets?
exam in 12 days, this is soo helpful! thank you :)
Hope it went well.
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!
@@NadinMagdy 8 marks... which paper did you do?
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
wow this lecture is great thanksss
This is great! thank you
Why does the MRI machine cost ~1million USD?
What does x mean btw?
Thickness of material through which the wave is passing.
I think you mean 2 dimensional image for ultrasound????
so fascinating
Thank you very much sir.
9:20
Thank you so much sir :)
Amos Goh Ziyan xxxbidio
thank you so much
Thanks a lot!
thanks a lot
brilliant
YOU ARE SERIOUSLY THE MAN SIR!!!! fk helped me alot!!!
MRI is not defined good need more
Huththoooooooooo kari kari oi thadaaaaaaaa