This is a Lightbox Radiology Education introduction to the physics of Magnetic Resonance Imaging (MRI). For more information on our courses and online e-learning products, visit lightboxradiology.com.au.
Great video but it has two minor errors that might throw people off. @7:30 The transverse vector decays much more quickly than the longitudinal vector is restored and so the transverse vector decay is effectively independent of the longitudinal relaxation. @8:22 To convert from the k-space (frequency domain) to the spatial domain you take the inverse Fourier transform, not the Fourier transform. Keep up the good work :)
this video is totally helpful for those who took the course and had difficulties but if a person has no idea about MRI before this will seem very complicated
I took a 4th year physics course that discussed how MRI works. I was surprised how complicated it really is. Even K-Space is complicated, you could take a 16 week course on just K-Space.
maybe if you're very low IQ? K space is just spatial frequency space. It just so happens it's the domain in which the signal is sampled. How is that complicated?
Lightbox Radiology Education It should be noted that it is an inverse Fourier transform that is applied (since you're moving from a frequency to a spatial domain).
is it a shame that i only learn fourier series in my mechanical engineering course or is it always linked together (ie fourier series with fourier transform)
Thank you. It's just fascinating how the transverse magnetization and relaxation is actually being received in radio frequency. I suppose that proves that the mouth is not the only thing we communicate with. I could be wrong
I'll start MRI school at Casa Loma in October. I'm hoping to know pretty much all of the anatomy and physics by then. Hopefully this is what they cover.
Very informative. Got a bit lost in how the XYZ value of a point in space, in the body part, correlates with the X magnet, Y magnet and Z magnet values.
I am still starting to Learn about MRI but the physics is very hard to understand, so if there is any courses to help me through this please drop a link, also thanks for this amazing video ✨
Where you wrote Fourier Transform it’s actually where you perform an inverse Fourier Transform, as you first Fourier Transform the digital signal (and you are in k-space), and then you do an inverse FT of the digitalised signal in order to visualise the image
one of the powerful/non destructive non evasive tool for perfect analysis.the Super-con magnet developed for low consumption of lq. helium is a boon to the user.A small version only for orthopedic investigation @ low field designed for arm/leg would be an advantage.
There is a lot of Simultaneous discoveries throughout history It kind of strange take the invention of the radio I pretty breathe taking advancement. The technology that made this discovery possible was available since Maxwell's equations came about but yet it was discovered Simultaneously in Italy and north America almost at the same moment It's just a head scratcher
X axis (horizontal) produces sagital images? And Y gradient produces coronal images? The diagram at 4:10 seems to show the opposite. Can someone clarify please?
imagine the x, y and z vectors as "normal-vectors" (it's the german word for that, dont know the english One atm) (basically a vector that stands perfectly orthogonal on a plane. those planes are the pictures you'll get
Actually, the use of the term "randomly" when talking about the alignment of hydrogen in water. In water, the hydrogen atoms tend to bias toward one side of the oxygen (108 degree angles, not 180). It is the spin of the proton that gives it a magnetic field, positive at one end, negative at the other. The oxygen bonds with the hydrogen by pulling away its one electron- and that means that the outer shell of the oxygen is now a negative charge (electrons are negative). At the hydrogen end, where the lonely positive hydrogen protons are both repelling each other, but still held to the oxygen(hence, again, 108 degree angles) The protons in the hydrogens now lack their electrons most of the time, and the positively charged proton give this side a positive charge. So the water molecule now has a positive pole and a negative pole (the reason water is called "polar"). So two neighboring water molecules tend to want to align with each other, positive pole to the other's negative. This can point the water in pure samples into a matrix where most of the water molecules face one direction, and the magnetic poles in the molecules proton wants to align in that matrix (Sometimes that amount of alignment is reduced by other molecules and their charges, as with nitrogen atoms in amino acids- which are in proteins). All this dynamic now performs when placed in a magnetic field and protons are struck with radio waves at their resonant frequency.. So my reason for all this is to make sure we understand the lesser but important role of the electron in all this, since the diagram seems to not be thorough enough in this area.
