Of Zoom FFT in Ultrasonic Blood Flow Analysis
adequate blood flow supply is necessary for all organs of the body. Analysis of
the blood flow finds its importance in the diagnoses of diseases. There are many
techniques for analyzing the blood flow. These techniques are not affordable by
the poor people because of their high expense. So we have implemented a technique
called Zoom-FFT. This technique is simple and affordable to detect the blood clots
and other diseases.
with his potential tries to get whichever is unexplored, explored, and till now
we are managing and succeeding using some technical ways. In the same way this
is one of the explorations made for scanning the intra details of some specific
objects using ultrasound named SONOGRAPHY, which is used as an alternative to
x-ray photography. In this paper, the method to zoom the image or the scanned
data-using zoom FFT has been discussed. It also explains the algorithm to get
ZOOM FFT and how it can be obtained via simulation. Real time experimentation
and its applications, with basics of ultrasound scanning are also explained. Here
a specific application will be dealt i.e., ultrasonic blood flow analyzer using
flow analysis is done by passing a high frequency ultrasonic wave in the blood
vessels through a transducer (transmitter) .The reflected signal; from the receiver
transducer has a different frequency due to the Doppler principle. This signal
is passed to a DSP processor to find the frequency spectrum. Because of the high
frequency of the ultrasonic wave, the resolution of the frequency spectrum output
will not be good. Therefore we go for advanced Zoom FFT technique, wherein a very
small frequency change due to the clot formation can be obtained with a good resolution.
It can be used to locate the initial presence of a blood clot. All of these tasks
must be achieved with a single DSP chip in order for the system to be both cost-effective
efficient and thus widely accepted.
1.Study of Bio-medical signal processing
the input signal to the base band frequency using Hilbert Transform
the down sampling using the decimation process
4.Obtaining the spectrum output
using fast Fourier transform
5.Simulation is done by Matlab/C.
DSP processor does real time implementation.
" Sound generation: The ultrasonic sound is generated using
the piezoelectric transducer
" Number of transducer may vary from 1 to
" Narrow beam of wave is to be feed in.
" Continuous mode
of operation with no timed switching is applied in real time to measure Frequency
" Doppler shift analysis for frequency content is to be
" Creation of image - to plot in 2 Dimension.
using color differentiation.
In an Ultrasonic blood flow analysis, a beam of ultrasonic
energy is directed through a blood vessel at a shallow angle and its transit time
is then measured.. More common are the ultrasonic analyzers based on the Doppler
principle. An oscillator, operating at a frequency of several Mega Hertz, excites
a piezoelectric transducer. This transducer is coupled to the wall of an exposed
blood vessel and sends an ultrasonic beam with a frequency F into the flowing
blood. A small part of the transmitted energy is scattered back and is received
by a second transducer arranged opposite the first one.
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