FIG. 3.
Comparison of different window widths bc for the localized gradient entropy calculations. The window widths bc = 2 cm, 4 cm, and 6 cm are shown for scale. When bc = 2 cm, the arteries appear sharper; however, the ghosting artifact from the fat wall is introduced. Additionally, noise amplification can be noticed outside the body. With bc = 14 cm, the arteries blur and a faint ghosting artifact appears above the liver; this region cannot be successfully approximated as linear translations. For a nice balance, bc = 10 cm is used for our corrections. This corresponds to a full width at half maximum of 5 cm.