In region of interest (ROI) brain analysis, the proper selection of voxels in ROIs plays a crucial role. In existing methods for selection of functionally homogeneous regions of human brain based on fMRI data, each voxel is attributed to some brain region, not taking into account the possibility of the existence of borderline voxels demonstrating transitional dynamics that cannot be clearly attributed to any of the regions between which these voxels are located. As a result, the situation when voxels formally assigned to one region, but located on the opposite borders of the region, have a correlation close to zero or even negative. In such cases the aggregation of voxels activity does not reflect properly the behavior of the whole area. In this article we present two methods for identifying functionally homogeneous regions based on fMRI data, using a correlation-cluster approach: One of the methods allows identifying functionally homogeneous regions, where voxels have a high level of correlation, while the second one allows identifying functionally homogeneous regions, which are stable over time. Both methods assume that not all brain voxels will be assigned to regions.
|Number of pages||8|
|Journal||Procedia Computer Science|
|Publication status||Published - 2020|
|Event||10th Annual International Conference on Biologically Inspired Cognitive Architectures, BICA 2019 - Seattle, United States|
Duration: 15 Aug 2019 → 19 Aug 2019
- functionally homogeneous areas
- ROI analysis