# Garyfallidis/didaktoriko

Merge branch 'master' of github.com:Garyfallidis/didaktoriko

• Loading branch information...
2 parents 6c48a66 + 611d0c2 commit 62970ade245dacff9eb15632792c41ce9726e41f committed May 4, 2012
Showing with 22 additions and 15 deletions.
1. +22 −15 Chapter_4.lyx
 @@ -119,7 +119,7 @@ ns but also introduces a barrier on understanding and interpreting the quality which can then be used as an input to other algorithms of higher order complexity, resulting in their greater efficiency. Beyond the use of this algorithm to simplify tractographies, we show here - how it can help identify landmarks, create atlases, compare and register + how it can help identify landmarks, create atlases, and compare and register tractographies. \end_layout @@ -183,7 +183,7 @@ key "Visser2010" \end_inset which we call Minimum average Direct-Flip -\begin_inset Formula $MDF(s_{A},s_{B})$ +\begin_inset Formula $\textrm{MDF}(s_{A},s_{B})$ \end_inset distance between track @@ -676,11 +676,11 @@ key "gerig2004analysis" also used hierarchical clustering with a symmetrised version of closest point distances, -\begin_inset Formula $MAM_{avg}$ +\begin_inset Formula $\mathrm{MA}\mathrm{M}_{\mathrm{avg}}$ \end_inset and -\begin_inset Formula $MAM_{max}$ +\begin_inset Formula $\mathrm{MA}\mathrm{M}_{\mathrm{max}}$ \end_inset (Hausdorff). @@ -794,11 +794,11 @@ key "ElKouby2005" \end_inset - created a ROI-based connectivity matrix where every + created a ROI-based connectivity matrix where the \begin_inset Formula $i,j$ \end_inset - point of the matrix holds the number of tracks which connect +th entry of the matrix holds the number of tracks which connect \begin_inset Formula $ROI_{i}$ \end_inset @@ -1222,7 +1222,7 @@ We experimented with QuickBundles using simulations, \begin_inset Formula $10$ \end_inset - human tractographies collected and processed by ourselves and one tractography + human tractographies collected and processed by ourselves, and one tractography with segmented bundles which was available online. \end_layout @@ -1369,8 +1369,15 @@ For the reconstruction of the real data sets we used Generalized Q-samping \begin_inset Formula $1.2$ \end_inset - and for the tractography propagation we used EuDX (euler integration with - trilinear interpolation) with + and for the tractography propagation we used EuDX (Euler integration with + trilinear interpolation, see +\begin_inset CommandInset ref +LatexCommand ref +reference "sec:Euler-Delta-Crossings" + +\end_inset + +) with \begin_inset Formula $1$ \end_inset @@ -2313,9 +2320,9 @@ Choice of orientation can become an issue when using the MDF distance and A step in QB takes account of the possibility of needing to perform a flip of a track before adding it to a representative track according to which direction produced the MDF value. - Though the appropriate orientation (direct or flip) of a track at the time - it entered a cluster was available in the MDF calculation, we allow for - the possibility this might not be the same later on when the virtual track + Though the appropriate orientation (direct or flip) of a track was available + in the MDF calculation at the time it entered a cluster, we allow for the + possibility this might not be the same later on when the virtual track has evolved so it will need to be recalculated. \end_layout @@ -2335,13 +2342,13 @@ One of the reasons why QB has on average linear time complexity derives QB can be extended for specific applications to contain more information about the clusters. For example, we could redefine -\begin_inset Formula $c\leftarrow\{I,h,n,h^{(2)}\}$ +\begin_inset Formula $c\leftarrow(I,h,n,h^{(2)})$ \end_inset to obtain second order information and in that way we could calculate the variance of the cluster where \begin_inset Formula $-h^{(2)}\leftarrow\{\sum_{i,j}\mathbf{x}_{ij}^{2},\sum_{i,j}\mathbf{y}_{ij}^{2},\sum_{i,j}\mathbf{z}_{ij}^{2},\sum_{i,j}\mathbf{x}_{ij}\mathbf{y}_{ij},\sum_{i,j}\mathbf{y}_{ij}\mathbf{z}_{ij},\sum_{i,j}\mathbf{x}_{ij}\mathbf{z}_{ij}\}$ +h^{(2)}\leftarrow(\sum_{i,j}\mathbf{x}_{ij}^{2},\sum_{i,j}\mathbf{y}_{ij}^{2},\sum_{i,j}\mathbf{z}_{ij}^{2},\sum_{i,j}\mathbf{x}_{ij}\mathbf{y}_{ij},\sum_{i,j}\mathbf{y}_{ij}\mathbf{z}_{ij},\sum_{i,j}\mathbf{x}_{ij}\mathbf{z}_{ij})\] \end_inset @@ -2488,7 +2495,7 @@ key "dempster1977maximum" \end_inset - and k-centers + and k-centres \begin_inset space ~ \end_inset

#### 0 comments on commit 62970ad

Please sign in to comment.