Ultrasonic Doppler MTI system for evaluation of aortocoronary bypass graft patency

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Authors

  • A. NOWICKI Institute of Fundamental Technological Research Polish Academy of Sciences, Poland
  • J. M. REID Institute of Applied Physiology and Medicine, United States
  • M. P. SPENCER Institute of Applied Physiology and Medicine, United States

Abstract

A new version of an analog multi-channel serial processing imaging gated pulse Doppler (IGPD) was developed. By combining double I/Q fixed echo cancellers with a phase detector and a double-loop recirculating delay line integrator (all made from C.C.D. delay lines), we obtained the degree of cancellation better than 60 dB. The penetration range of the device was 12 cm permitting the investigation of the intracardiac flow. The results of the preliminary application of IGPD to the detection of patency of coronary bypass grafts will be shown.

References

[1] M. BRANDESTINI, Topoflow digital full range Doppler velocity meter, IEEE Trans. on Sonics and Ultrasonics, SU-25, 287 (1978).

[2] B. DIEBOLD et al., Noninvasive assessment of aortocoronary bypass graft patency using pulse Doppler echocardiography, Am. J. Cardiology, 43, 10-16 (1979).

[3] P. A. GRANDCHAMP, A novel pulsed directional Doppler velocimeter. The phase defection principle, E. KAZNER (ed.), Publ. Exc. Medica (1975), Amsterdam, 122-132.

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