Diffusion Tensor Imaging EXPLAINED (DTI, FA, Tractography) | MRI Physics Course Lecture 15

Diffusion Tensor Imaging… Math so scary that even Einstein ran for help! Why the switch from DWI to DTI? What is a tensor, this term Fractional Anisotropy, and why would you spend your time watching this video when you could be watching cat videos and actually enjoying life? Because there are SO MANY cat videos, and SO FEW videos going into the weeds on this critically important subject. So say your goodbyes to Felix and let’s tackle Diffusion Tensor Imaging on the latest episode of MRI Physics Explained!

CHAPTERS
00:00 Intro/Recap
03:46 Isotropic vs. Anisotropic Diffusion
09:26 Why DWI is Not Enough
13:38 The Diffusion Tensor
17:26 Solving the Diffusion Tensor Matrix
21:48 Tractography
25:54 Fractional Anisotropy (FA)
29:07 Outro

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[MRIPhysicsEXPLAINED]

One additional thing you may have noticed in practice but which I forgot to add to the video... On some MRI exams, you may see DTI was performed instead of DWI, yet you still see an Isotropic or Trace image produced. From the video, hopefully you can now see DTI is somewhat of an overkill version of DWI. These "cheap" DTI sequences typically use the minimum 6 gradients needed to perform DTI imaging and generate FA images yet are not accurate enough to use for Tractography. However, you can still calculate a Trace image from the images produced by the diagonal gradients (Dxx, Dyy, Dzz), as well as an isotropic image (geometric mean) of the images produced from all gradients applied and thus you clinically treat these just the same as the Trace or Isotropic images produced from a standard DWI sequence.

[shiroufubuki]

PROFESSOR Finally the great courses❤❤❤❤thank you for your efforts. I'm a radiation physics student.