FIG. 6.

(a) A schematic of the probe of PEF being pushed in with a depression depth during the in vivo measurement, and (b) the measured elastic modulus at y = 5 cm versus distance around a tumor center at x = 7 mm with a 2-mm (full circles) depression depth, 4-mm (open squares), and a 6-mm (full diamonds) depression depth. Note that the elastic modulus of the normal tissue away from the tumor remained unchanged regardless the depression depths. Although the measured elastic modulus at the center of the tumor became larger, the size of the tumor taken as the width at the half peak height of the Gaussian fit was 3.1 cm with a 2-mm depression depth, 3.0 cm with a 4-mm depression depth, and 3.2 cm with a 6-mm depression depth, which was essentially the same within the experimental uncertainty of about 10%.