Early Clinical Ultrasound Doppler

Ref. M13

Acquired in 1980, this was the first clinical continuous-wave Doppler machine in Lebanon. It consists of the Doppler machine proper on the left, and the monitor to the right in the upper pictures. The Doppler part was equipped with two probes, 4 and 8 MHz, and with a pedal operated recording system on EKG paper. With the advent of pulsed duplex color Doppler which became an integral part of ultra-sound machines in the late eighties or early nineties, this equipment became obsolete.

Note in the picture of the open monitor, the cathode ray tube for the image diasplay, equipped on its back end with the white heat sink visible exteriorly.

(With continuous-wave Doppler ultrasound, the emitting and receiving crystals function continuously and display information representative of all moving targets in the ultrasound beam. The continuous mode has no limitation of recordable velocities and therefore allows accurate measurement of high velocities. The signal, however, is not gated (it receives all underlying velocities); thus, spatial localization of the abnormal velocities is lacking).