Dr. Karl Dussik, a psychiatrist, at the hospital in Bad Ischl,
Austria was the first person publishing a medical use of diagnostic ultrasound.
He was trying to locate brain tumors with a new method consisting of an
ultrasound emitter at one end and an ultrasound receiver at the other. The
patient stayed between the two devices. He measured the ultrasound beam
transmission through the patient's head. The outbound ultrasound beam power was
known and he calculated the receiving power, defining ultrasound attenuation and
reinforcement. He also tried to visualize the cerebral ventricles by measuring
the ultrasound beam modification through the head. Dr. Dussik published his
technique in 1942 with the name of "Hyperphonography of the Brain."
