30-01-2016, 12:18 PM
ABSTRACT
An 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. Here a specific application will be dealt i.e., ultrasonic blood flow analyzer using ZOOM FFT. The
implementation must be achieved with a single VLSI chip in order for the system to be both cost-effective and power efficient and thus widely accepted.
Introduction
Blood flow analysis[1] 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 MATLAB Simulink input 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 VLSI chip for the system to be both cost-effective and power efficient.