COMPARISON OF NON-UNIFORMITY-CORRECTION ALGORITHMS 
USING HIGH-RESOLUTION T1-WEIGHTED MRI SCANS 
FROM TWO DIFFERENT CENTERS

Figures 11 and 12 compare the performance of five non-uniformity-correction algorithms (spm excluded) on two Minneapolis VAMC and two UCLA high-resolution T1-weighted MRI scans (see text). All non-uniformity- correction algorithms except cma operated on stripped volumes; cma volumes were stripped after bias correction. Principal component analysis was applied to the uncorrected volume and the five bias-corrected volumes for each subject, and scatter plots of the first two scaled eigenvectors (E1, E2) for each subject (volume) are illustrated below. Single slices of the bias-corrected volumes and the extracted bias fields are also shown.

    - Biased Brain Phantom Data (Figs. 1-4)
    - Multiple Repeat T1-weighted MRI Scans of a Single Subject (Figs. 5-10)

    - Return to Introduction Page

Figure 11 
Figure 12

A representative slice from the uncorrected and corrected volumes (upper rows) and from the extracted bias volumes (lower rows) for each of the UMN and UCLA high-resolution MRI brain scans.

 
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