A microcomputer-based system for coronary artery Doppler studies.
Intra-vascular Doppler catheters are becoming popular as research tools for studies of the coronary circulation. Velocity estimates can be obtained from Doppler signals sampled with such catheters, and used to calculate various derived parameters which can then be correlated with the haemodynamic situation under investigation. This note discusses the requirements necessary for a system to perform the acquisition of the high-frequency Doppler signals obtained from catheter-tipped transducers, and a system developed to capture, process and store Doppler, ECG and pressure signals is described. Software used to calculate parameters from the stored waveforms is discussed and examples of the system outputs presented.
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