Biomedical Engineering Reference
In-Depth Information
Fig. 1.52.
A histogram showing a preoperative and postoperative instance of the
mean value of the power spectrum strength of ten heartbeats of a coronary artery
bypass patient
The dynamic flow imaging of coronary blood flows can be analyzed by
the new technology using calculations of time serial signals, power spectral
densities, and trajectories. Detailed data showed that the turbulence flows
due to stenosis and calcification of the coronary artery, restenosis, or rem-
nants of stenosis after PTCA and little improvement of coronary artery flow
following CABG had produced chaos in coronary blood flow. The diastolic
noises detected on the anterior chest wall were analyzed to determine whether
or not multi-periodic or chaotic signals had been contained. In the normal
coronary artery, the flow dynamics showed quasi-periodic cycles. Turbulent
flows produced chaos in the coronary blood flow in the atherosclerotic coro-
nary artery. The trajectory is a useful tool as an indicator of the coronary
flow dynamics.
1.8.12
The Future of the New Laser Phonocardiography
Technology
The present invention is aimed at providing a diagnostic system for coronary
artery disease and other conditions, and a diagnostic method using the above
