Enhancing the Detection of BOLD Signal in fMRI by Reducing the Partial Volume Effect

Figure 9

The 𝑡-scores are evaluated in the original and magnitude interpolated activation maps in the FEF region in six subjects. Each circle in this plot shows an interpolated voxel that has a higher 𝑡-score (𝑦-axis) than the highest 𝑡-score of its nearest original neighbors (𝑥-axis), either an A-type (open circle) or B-type (gray solid circle) voxel. In the 6 interpolated maps, the 𝑡-scores in 49 of a total 311 voxels are higher than the highest 𝑡-scores in the nearest neighboring original voxels, with an average of 14.4% increase of the 𝑡-score. In each of the 4 interpolated voxels shown as dark solid circles, the highest 𝑡-score of its nearest original neighbors is below the threshold of 3.18 in the original maps.