Introducing MRI: Slice Selection (21 of 56)

[@katushacornwall998]

This entire series of lectures are epic. I am so grateful to have been able to listen to them all the way from Trinidad. I definitely would not have passed my exams without it. Please keep doing them

[@RickTurpinScuba]

Prof. Lipton, you are a superb lecturer. Many many thanks

[@wilbertojrodriguez8926]

I'm taking my MRI ARRT test in 2 momth and this is by far the best videos of physics ever made. So accurate. I'm following this with some other literature and is so accurate. Thank You Doctor.

[@bonob0123]

LMFAO...he's so happy when he slides that stick figure into the scanner. awesome.

[@dr.adrianoliguori]

Absolutely fantastic! So far, best tutorial for MRI physics I've ever encountered. I've binge watched in the past few days and I'm excited about the next chapters.

[@mandolinic]

I have no idea why I'm watching these, because I'm never going to operate an MRI scanner, but they are completely fascinating and I'm hooked. Thanks

[@balukus1107]

I needed these lectures to pass a class! Thank you so much for posting these, invaluable!

[@kmacdiddy1]

by the way, watching all of this and other resources. It's complicated but I am soldiering on. Along with many other resources, this is a good lecture. Thank you for publishing it Dr. Lipton.

[@Pete-qn2du]

Actually it's not the non-ideal RF amplifier that causes a mixture of frequencies to be transmitted to the patient, but rather the RF pulses that contain a whole band of frequencies (depending on pulse shape and length)

[@jacobvandijk6525]

B0 is still represented by a 1D vector. But really, we are dealing with planes now - just like he draws the area of the gradient-coils here: 11:51. Key-point: 24:37.

[@shashwatpriyadarshi972]

With all due respect ,in most other places I have read and heard that magnetization vector aligns itself along the direction of external magnetic field.

[@mustafabb2953]

35:40 to 36:20 is the summary

[@OmedyStories]

Hey Sir, I just watched your video and I must say that it was really informative and well-made. I was wondering if I could help you edit your videos and aslo highly engaging thumbnails as well?

[@drrassieq1807]

Professor mentioned we select a slice at isocenter, then we can select another slice as the RF pulse frequency needed for that particular slice can be predicted. My Question is if the frequency along the gradient can be predicted rather calculated Why do we select the first slice at isocenter?

[@pankajbajaj9578]

Bionic compiled nmr images can reproduce genetically modified 3d humans run by ham rd frequencies at constant and variable speeds to perform all human operations produced by 3d printers

[@petergianakopoulos4926]

Excellent teaching.

[@landrynzudie5752]

Excellent explanation of this complex topic. Thank you!

[@tarundeka776]

Dear Sir I have a question, what is relation of RF bandwidth with slice thickness? Do thin slices require narrow bandwidth? Waiting for the answer Sir!

[@quarter_moon_and_a_guitar]

Thanks for the set of videos, many which are helpful. But when the radiologists in the room seem bewildered, there's room for simplification. Try beginning with this KZbin video: "How does MRI work" by HarounExplainIt. Once the basics of slice selection are clear, the physics will make far more sense.

[@prostysposob6716]

These lectures are so interesting and easy-to-grasp that I'am watching just out of curiosity. I have watched 21 vidoes already and I don't know when :D

[@farzamsayah7133]

Hello! Can anyone here answer a question i got: Does B0 have to always be oriented along the z axis or can it change? Because it's easy to understand how the Slice selection gradient adds up to the B0 when they're both along the same axis but what if the gradient is along the y axis, does B0 have to also be along the y axis? In short, does B0 have to always be oriented in the same direction as the gradient? Thank you

[@Pete-qn2du]

Hi what is usually hard to understand for people new to MRI is the meaning of the gradient directions X, Y and Z. The main field B0 of the MRI magnet is fixed and ALWAYS in the same direction, usually defined as Z. So what we are interested in doing when we apply a gradient X, Y or Z (or superposition of any of those) is to CHANGE the B0 field, therefore only gradient components in B0 direction are of interest. But what does it actually mean if we apply a Y gradient for example? Imagine you had a magnetic field sensor that displayed the field component in B0 (Z) direction only, and you MOVED with it along the Y axis, you would see a CHANGE of B0 depending on the sensor position along the Y axis. If you moved it along the X or Z axis, the magnetic field would stay constant. Same applies to X or Z gradients of course, they change the B0 field depending on the position along the axis that gives the gradient its name. Hope this helps!

[@aayushnepal5223]

@@Pete-qn2du thats right

[@kmacdiddy1]

the gradient magnet current directions are wrong, according to the right-hand rule... yes??? Looks like the drawing's arrows indicating current (I) direction are reversed by accident? can anyone clarify?

Nope pretty sure he has it right... have your right thumb point in the direction of the current and then look at the direction your fingers are pointing in (e.g. thumb-up = fingers-pointing-left)

[@pankajbajaj9578]

Variable frequency energy collimater

[@chloecalderon2675]

This was incredibly helpful. Thanks so much!

[@Gray_lyf]

Thank you very much sir

[@GeneralRadiology]

Nice job sir

[@MrDaanjanssen]

The easy by which he just throws that poor patient into the scanner... has science gone too far?!

[@amitsingla5048]

@drlipton @alberteinstein college of medicine , dont you think the magnetisation in our patient will be induced in the same direction as the externally applied magnetic field. reference- at time 1.09 minutes

[@joshmarchant9461]

Very helpful! Thank you!

[@elsabethwondwossen5420]

Thank you

[@dimitrismwrakis6910]

well done sir!!

[@rlmattoo9987]

Very informative d

[@divyanganarakesh]

I want him as my teacher instead

[@ravi44200]

your videos are awesome, thumbs up but what to do , i am so dumb 🙄😶😑😏

[@lalrinkimi189]

very helpful ..ty