T1 recovery? Are you sure you understand it?

T1 recovery? Are you sure you understand it? https://community.imagingqa.com/uploads/db7746/original/1X/d58cf72f9c80bca82087a5a0fd85c0352fdcc5be.png
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T1 Recovery, Inversion Recovery and Inversion Time(TI) Explained ← Watch Video

If you’ve ever been confused about why or how a Stir is based on T1 Contrast watch the video above.

T1 Recovery is such an important concept to understand when learning about MRI Imaging Contrast and yet it is often misunderstood. In this episode of Zone 3 podcast, Matt Hayes, an MRI Educator, and Creator of ImagingU/ScanlabMR explains how T1 Recovery really works and Why it is often explained incorrectly.

Matt explains how T1 Recovery works. He also gets into how inversion recovery and Inversion Time are related to the T1 Recovery process by explaining the Null point.

Thanks for joining us here in Zone 3. :fire::100: :100: :fire:

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Question from the Youtube Channel. Figured I would repost it here. It’s a great question.

This may be a dumb question but the “null point” means the same thing as full transverse magnetization right? You guys are awesome, loving the channel!
-Chance Bridges (10/26/21)

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Really enjoyed this podcast breaking down T1 recovery in a simple way with relevance to sequences commonly used in the clinic.

In response to the question posted by @Kobie_Dollar, “null point” is referring to the point in the recovery of the longitudinal magnetization where a tissue will produce no signal if excited by a 90 degree pulse. Therefore, there would be no transverse magnetization after excitation for a tissue whose longitudinal magnetization is at the null point in the recovery.

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Some great examples to illustrate use of T1 recovery to generate different contrasts. An additional technique not mentioned, that I’ve used previously, is Time of Flight MRA (angiography).

In MRA, repetitive RF pulses with short TR are used to ‘saturate’ tissue within the excitation slab. The longitudinal magnetization is not allowed to recover completely and the signal in the image from these tissues is suppressed. Blood that flows into the imaging slab and has not experienced previous RF pulses, is fully magnetized and generates signal that is much greater than that of the surrounding tissue. As a result, a flow enhanced image is generated containing bright blood vessels.

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Thank you for helping to CLARIFY this further. Your user name is Very Fitting. :smile: Cheers

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Thanks @Zone3podcast, glad my explanation made sense!

To add to the examples @UCLjames, there’s the whole world of ‘Inversion Prepped’ sequences making use of T1 recovery - the much loved MP-RAGE being a prime example!

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