the combination of a &# 34 ; c &# 34 ; mode scan electronics in a portable , battery powered biomedical ultrasonoscope having &# 34 ; a &# 34 ; and &# 34 ; m &# 34 ; mode scan electronics , the latter including a clock generator for generating clock pulses , a cathode ray tube having x , y and z axis inputs , a sweep generator connected between the clock generator and the x axis input of the cathode ray tube for generating a cathode ray sweep signal synchronized by the clock pulses , and a receiver adapted to be connected to the z axis input of the cathode ray tube . the &# 34 ; c &# 34 ; mode scan electronics comprises a plurality of transducer elements arranged in a row and adapted to be positioned on the skin of the patient &# 39 ; s body for converting a pulsed electrical signal to a pulsed ultrasonic signal , radiating the ultrasonic signal into the patient &# 39 ; s body , picking up the echoes reflected from interfaces in the patient &# 39 ; s body and converting the echoes to electrical signals ; a plurality of transmitters , each transmitter being coupled to a respective transducer for transmitting a pulsed electrical signal thereto and for transmitting the converted electrical echo signals directly to the receiver , a sequencer connected between the clock generator and the plurality of transmitters and responsive to the clock pulses for firing the transmitters in cyclic order ; and a staircase voltage generator connected between the clock generator and the y axis input of the cathode ray tube for generating a staircase voltage having steps synchronized by the clock pulses .