Recovery coefficients of differently sized spheres in a warm background (sphere/background = 7) before and after filtering at two different noise levels. Left: noise level 28%. Right: noise level 38%. MAF, moving average filter (ΓM = 7 mm); BF, bilateral filter (ΓS = 9 mm). For BF, three different settings for the width of the intensity-dependent part of the filter are used (see plot legend). A general slight decrease of signal recovery in small spheres at the higher noise level can be observed, but the increased noise does not have a specific (more pronounced) effect on BF.