Biomedical Engineering Reference
In-Depth Information
Fig. 1.50.
A diagram showing the layout of the diagnostic system for coronary
artery disease and other conditions in the present invention
In the electrical processing of the measurement signal, in order to reduce
systematic errors, a power supply that suciently takes into consideration the
internal noise deriving from the measuring apparatus and the noise entering
the measuring system and the ultra-low noise and supersensitive amplifiers
and others are used, and the connection method and others are done.
The stenotic murmur signal in the measured signal of the outputting ob-
ject is formed as a whole, and contains the remaining noise signal deriving
from the measuring system, which cannot be removed, and the noise signal
deriving from the measured object. In order to acquire the signal of the mea-
sured object, which is buried in the noise by exceeding the signal-to-noise
ratio of the system, it is separated from the other noise by using a signal-
processing technique, which follows our earlier research. It has known from
our earlier research that the frequency of the noise vibration of the steno-
ticmurmuranditspowervaluearedeterminedbytheinternaldiameterof
the stenotic site, the flow velocity, the viscosity of the blood, and other fac-
tors. Therefore, conversion into the frequency domain compares the signal
of the object. Then, it is displayed as the power value of the generating fre-
quency after conversion into the frequency domain by using the maximum
entropy method (MEM) as a means of linear prediction. In this form, it is
measured by using the complex multiple sensor system shown in Fig. 1.50 as
a basic measuring system. In Fig. 1.50,
21
is the detector of the vibration
signal of the measured object, which has one or a number of laser source
heads and a vibration detecting sensor of the measured object (complex sen-
sor) with a laser displacement gauge and a three-axis accelerometer,
22
is
a vibration-detecting sensor of environmental noise for a bed using a three-
axial accelerometer in a detector of vibration signal of environmental noise
