Retrospective Evaluation and Correction of Intensity Inhomogeneity - Advance Image Processing in Magnetic Resonance Imaging - page 148

(a)

(b)

(c) (d)

(e) (f)

FIGURE 5.2 Illustration of the inhomogeneity field estimation component of the algo-

rithm of Wells et al. [7]: (a) original image, (b) intermediate classification, (c) reconstructed
image, (d) residue image, (e) weights, and (f ) estimated inhomogeneity field. Although
the calculations are performed on logarithmically transformed intensities, the reconstructed
image, the residue image, and the inhomogeneity field are displayed in the original intensity
domain for visualization purposes.