Fig. 4
From: Experimental study of beam distortion due to fiducial markers during salvage HIFU in the prostate
Change in the (a) lesion volume and (b) lesion position as a function of the offset between the focal position and the marker, when the focal position is translated along the anteroposterior (z) axis. Each measurement was repeated 8 times, and the error bars show one standard deviation. A negative change in volume indicates the lesion volume was reduced, and a negative shift indicates the lesion was shifted towards the transducer