Abnormality Detection on Simulated Arterial Systems

by M. E. Clark,
G. F. Ayala,
S. L. Hawkes,

Serial Information: Journal of the Engineering Mechanics Division, 1969, Vol. 95, Issue 5, Pg. 1189-1215

Document Type: Journal Paper


As the need exists for improvement of current techniques for detecting and evaluating disorders of the arterial system, a feasibility study was made to investigate the use of changes in fluid impedance as a diagnostic tool. Because any discontinuity produces reflections of the incident waves, the impedance diagram, calculated via hydraulic transmission line theory, shows resonances at selected frequencies. A detailed study of the origin of these resonances has been made for normal discontinuities in simple and multibranched systems and also for abnormal discontinuities of the types that are encountered in the arterial circulation. Particularly, it was found that stenotic disorders located near the input of a system caused either a dramatic peaking of the impedance modulus at certain frequencies or a unique resonance at low frequency. Resonant frequencies for both open-end and closed-end reflection sites were in general agreement with a modified organ-pipe analogy for single flexible vessels. It is concluded from this study that feasibility of the method has been demonstrated in the elementary systems chosen for study.

Subject Headings: Feasibility studies | Resonance | Discontinuities | Diagnosis | Wave reflection | Hydraulics | Power transmission | Frequency response

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