diff --git a/episodes/diffusion_tensor_imaging.md b/episodes/diffusion_tensor_imaging.md index 7eb08800..f9302524 100644 --- a/episodes/diffusion_tensor_imaging.md +++ b/episodes/diffusion_tensor_imaging.md @@ -57,7 +57,7 @@ Tensors are represented by ellipsoids characterized by calculated eigenvalues ($\lambda_{1}, \lambda_{2}, \lambda_{3}$) and ($\epsilon_{1}, \epsilon_{2}, \epsilon_{3}$) eigenvectors from the previously described matrix. The computed eigenvalues and eigenvectors are normally -sorted in descending magnitude (i.e. $\lambda_{1} \\geq \lambda_{2}$). +sorted in descending magnitude (i.e. $\lambda_{1} \geq \lambda_{2}$). Eigenvalues are always strictly positive in the context of dMRI and are measured in $mm^2/s$. In the DTI model, the largest eigenvalue gives the principal direction of the diffusion tensor, and the other two eigenvectors