Abstract
The progression of cognitive deficits in frontotemporal dementia (FTD) is accompanied by white matter
deterioration. However, the impact of neuronal loss on the connectivity of the structural network in the FTD and its variants is not
well understood yet. This study aimed to evaluate the potential of structural brain connectivity, in the identification of alterations
and changes produced by the FTD and its variants, and the relevance of these measures for its differentiation. A total of 137
studies of dMRI divided as follows: 20 patients with semantic dementia (SD), 20 with progressive primary aphasia (PPA), 52 with
behavioral variant (bvFDT) and 45 controls were part of the study. The structural connectivity derived from dMRI was estimated
for the whole brain. Two types of analysis were executed: topological measures by graph theory and network-based statistic.
Global topological organization in the 3 variants of FTD was significantly altered compared to controls, as seen in measures like
connection strength, path length and global efficiency. The bvFTD was characterized by a preferential interhemispheric alteration
focused on the frontal region of the left hemisphere. In the PPA a few alterations were detected in the inferior frontal gyrus.
While patients with SD showed a greater extension of altered networks, due to high disconnections in the temporal lobe in both
hemispheres. The global alterations of the structural networks suggest a change in the efficiency of information exchange between
brain regions. Likewise, the location of these changes can be related with the neuropathological progress of the FTD
deterioration. However, the impact of neuronal loss on the connectivity of the structural network in the FTD and its variants is not
well understood yet. This study aimed to evaluate the potential of structural brain connectivity, in the identification of alterations
and changes produced by the FTD and its variants, and the relevance of these measures for its differentiation. A total of 137
studies of dMRI divided as follows: 20 patients with semantic dementia (SD), 20 with progressive primary aphasia (PPA), 52 with
behavioral variant (bvFDT) and 45 controls were part of the study. The structural connectivity derived from dMRI was estimated
for the whole brain. Two types of analysis were executed: topological measures by graph theory and network-based statistic.
Global topological organization in the 3 variants of FTD was significantly altered compared to controls, as seen in measures like
connection strength, path length and global efficiency. The bvFTD was characterized by a preferential interhemispheric alteration
focused on the frontal region of the left hemisphere. In the PPA a few alterations were detected in the inferior frontal gyrus.
While patients with SD showed a greater extension of altered networks, due to high disconnections in the temporal lobe in both
hemispheres. The global alterations of the structural networks suggest a change in the efficiency of information exchange between
brain regions. Likewise, the location of these changes can be related with the neuropathological progress of the FTD
| Translated title of the contribution | Cerebral strutural onnetivity analysis in frontotemporal dementia using diffusion resonane imaging |
|---|---|
| Original language | Spanish |
| Pages (from-to) | 35-51 |
| Journal | Revista Ingeniería Biomédica |
| Volume | 13 |
| Issue number | 25 |
| DOIs | |
| State | Published - Jun 2019 |
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