Focal range locating system for lithotrity

A system for locating the focal range of the shockwaves generated by a shockwave source relative to a concrement situated in the body of a living being, comprising:

• an ultrasonic scanner;
• an ultrasonic B-scan imaging device, coupled to the ultrasonic scanner for generating ultrasonic B-scan-images of an image area within the body,
• image memory means for storing said ultrasonic B-scan-images in chronological sequence;
• correlating means for dividing said B-scan-images into image segments, and for correlating image segments of a first B-scan-image with a corresponding image segment of at least one subsequent B-scan-image to detect motion induced in the body by said shockwaves;
• trigger means providing a signal to said correlating means that limits the detection of motion to a predetermined time window after a triggering of shockwaves;
• means for generating a color-coded speed pattern of the image area in response to motion detected by said correlating means;
• and
• means for superimposing said color-coded speed pattern on the ultrasonic B-scan-images.