Figure 4From: Magnetic microbubble-mediated ultrasound-MRI registration based on robust optical flow modelUS ROI segmentations by different values of parameter ν ( λ 11 = λ 22 = 1, μ = 0) with active contour model. Top: segmentation results without MMBs (a) ν = 100. (b) ν = 300. (c) ν = 500. (d) ν = 2000. Bottom: segmentation results with MMBs (λ1 = λ2 = 1, μ = 0) (a') ν = 2000. (b') ν = 500. (c') ν = 100. (d') ν = 5.Back to article page