Diffusion Weighted Imaging (DWI) and Apparent Diffusion Coefficient (ADC)

Diffusion Weighted Imaging (DWI) and Apparent Diffusion Coefficient (ADC) | MRI Physics Course #22

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Күн бұрын

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The goal of diffusion weighted imaging is to assess the degree of diffusion within each voxel of a slice.
Diffusion weighted imaging uses a series of MRI pulse sequences to generate both a b0 (b zero) image as well as many source diffusion weighted images. The signal from the source images is combined to form a DWI trace image.
Here we discuss the process of creating these images and what the measured signal represents. We then look at how we can use the b0 and DWI trace images to create an ADC map.
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Пікірлер: 41

@user-uk1wi9ue3c 6 ай бұрын

SE-EPI DWI is predominantly T2-weighted because of the 180-degree refocusing pulse, which corrects for dephasing due to field inhomogeneities. T2* effects from the EPI readout are minor.

@freinoeselmejor 5 ай бұрын

I wanted to ask this, because he repeatedly stated that the image was T2*-weighted. But it should be T2-weighted because of the rephasing 180° RF Pulse, right?

@mcwolke 5 ай бұрын

I had the same understanding.

@natasha5423 2 ай бұрын

Same question

@AsifKhan-mw4mw 23 күн бұрын

Thanks brother...because of you I understand MRI Physics...keep it up❤

@sanawarhussain 7 ай бұрын

Thank you, much awaited

@sohailkohri7269 7 ай бұрын

Most awaited lecture❤❤

@architpatel700 7 ай бұрын

Thank you so much! This was very helpful

@asmaajlasimranmaqbool4855 5 ай бұрын

Excellent series Really helpful

@johannarumenapp5372 7 ай бұрын

Thank you for your great explanations! Helps a lot!! Could you please do a video about diffusion tensor imaging?

@brightugwueze4512 7 ай бұрын

Thank you so much Dr

@parsleyg7832 6 ай бұрын

🤦 I FINALLY understand this! Thank you so much!

@radiologytutorials 6 ай бұрын

Wow! Thank you so much. That’s very generous. So glad this helped!

@DJMaster26 7 ай бұрын

Thank you very much indeed!

@radiologytutorials 7 ай бұрын

My pleasure 👍🏼

@EllieRad2023 6 ай бұрын

Wonderful

@umeshchandrabehera9242 7 ай бұрын

Nicely understood…..please make a video on ct and mri anatomy of orbit

@rg942 7 ай бұрын

Excellent series, your videos have been invaluable for FRCR revision. Do you mind sharing whether the question bank will be made available to radiopaedia all access pass holders, and roughly what time frame this might be? Thanks

@pvbb7893 5 ай бұрын

Simply the best. As always.

@radiologytutorials 5 ай бұрын

Thank you ☺️

@ayaansingh1249 7 ай бұрын

After a long time, thnks a lot for the lectures. Love from india

@amellayouni1571 7 ай бұрын

you're genius

@anumfarooq9431 6 ай бұрын

Kindly make videos of nuclear imaging.stay blessed.

@dansaeed19 6 ай бұрын

You are my hero

@RahulGupta-lk3qw 7 ай бұрын

Please can u make a detail lecture on ct scan...❤

@rachelcullens1911 2 ай бұрын

Can you do a SWI susceptability weighted imaging tutorial please? Thanks so much for your work, or ngaa mihi nui as we say in Aotearoa, NZ.

@abosaleh3318 Ай бұрын

Should I learn this as an aspiring neurosurgeon?

@sahajkaur8553 7 ай бұрын

How many videos are there going to be in the MRI series?

@LilMissSqueak 4 ай бұрын

Why is the B0 a T2* image if there is a 180 degree RF pulse used and a longer TE? - would the 180 degree RF pulse counter the T2* effects and make a T2 image?

@local93 7 ай бұрын

Even though we confirm with ADC that restriction is true why do we still value dwi more than ADC and dwi together? Like in pirads we can count high signal on dwi even with normal ADC. In general hyperintensity on dwi even without hypo on ADC should be at least suspicious.

@dylanropert 5 ай бұрын

B0 creates T2 not T2* because of 180 pulse, correct?

@stanyjerosha1745 6 ай бұрын

Why is B0 a T2* W image when there is a 180 degree pulse applied at TE/2, shouldn’t it be a T2WI ?

@aaqibzyt 7 ай бұрын

Ive a question . How do Diffusion gradients in same directions lead to rephasing? If they were in opposite directions id get it cuz laggers become leaders but it is in the same direction so the leader will still be going faster than the lagger on the second gradient? I am considering a voxel with all in phase and then gradient along one plane in my model and applying the previous leader lagger model.

@radiologytutorials 7 ай бұрын

The 180 degree RF pulse causes the ‘leaders’ to become the ‘laggers’. If there was no RF pulse the diffusion gradients would need to be in opposite directions. However the 180 degree RF pulse means that the two diffusion gradients will effectively be equal and opposite.

@aaqibzyt 7 ай бұрын

@@radiologytutorials somehow it makes sense now. Thank you. Master Sorcerer.