We previously proposed a noninvasive method for diagnosing early-stage arteriosclerosis. This method used ultrasound to
detect small vibrations at two adjacent points on the aortic wall. Here we propose a new method for simultaneous measurement
of small vibrations at multiple points within several centimeters on the aortic wall by controlling the direction of the ultrasound
beam produced by an ultrasonic diagnostic system. By analyzing signals from these small vibrations, we obtained simultaneous
local pulse-wave velocities at multiple points along the aorta. The principle of this method is described, as is its confirmation
through experiments using a silicone tube in a water tank and experiments in vivo for the wall of the abdominal aorta.