Figure 3.

Filtering performance of non-adaptive (NA), semi-adaptive (SA), and fully-adaptive (FA) NESMA and MS-NLML filters on an in vivo T₂W dataset. Results are shown for three different TEs. The grayscale is consistent across filtered images and across TEs. Noisy images are shown for comparison. R-maps and T-maps show, respectively, number of voxels and threshold selected at each location for the NESMA and MS-NLML filters. SA-NESMA and SAMS-NLML filtered images show similar noise reduction. However, FA-NESMA and FA-MSNLML show slight differences in filtering, which can be attributed to the FA method selecting different values for R (white arrows). Also, it can be seen in the ventricles that the FA method selected fewer voxels compared to the SA method, leading to less blurring (black arrows).