Ultrasound B-mode and strain images. The ultrasound B-mode image of a glioblastoma (grade IV) in (a) and the corresponding strain magnitude image (b). For display purposes the delineation of the solid tumour close to the location of the measurements is marked with a bright line in the B-mode image. The B-mode intensity plotted along the lateral direction at a user- selected depth is shown in (c), with the numbers of the x-axis referring to the distance [m] from the lateral midpoint of the image. The strain magnitudes are plotted in similar way and displayed in (d), with the Y-axis showing strain magnitude values from 0–8 ‰. The depth of the plotted magnitudes is for display purposes indicated with a bright arrow in (a) and (b). The values picked for estimation of contrast between tumour tissue and assumed normal tissue are indicated by black arrowheads in (c) and (d).