Title :
Doppler ultrasonograph with CORDIC based spectrum analyzer for blood flow velocity estimation
Author :
Dhar, A.S. ; Banerjee, S.
Author_Institution :
Dept. of Electron. & Electr. Commun. Eng., Indian Inst. of Technol., Kharagpur, India
Abstract :
An ultrasonograph system for estimating flow velocity of blood in vessels is proposed which incorporates a spectrum analyzer for observing the Doppler shift occurring due to the flowing blood. The Doppler signal is extracted from the reflected ultrasonic wave by a synchronous demodulation technique and then fed to an analog-to-digital converter through a sample-and-hold circuit. The spectrum analyzer uses FPGA based signal processing chips realizing vector rotations utilising a modified CORDIC algorithm for computing the discrete Hartley transform which is a real valued alternative to the discrete Fourier transform
Keywords :
Doppler measurement; Hartley transforms; biomedical equipment; biomedical ultrasonics; blood flow measurement; medical signal processing; spectral analysers; ultrasonic velocity measurement; CORDIC based spectrum analyzer; Doppler shift; Doppler ultrasonograph; FPGA based signal processing chips; analog-to-digital converter; blood flow velocity estimation; discrete Fourier transform; flowing blood; medical instrumentation; modified CORDIC algorithm; reflected ultrasonic wave; sample-and-hold circuit; synchronous demodulation technique; vector rotations; Analog-digital conversion; Blood; Circuits; Demodulation; Discrete Fourier transforms; Doppler shift; Field programmable gate arrays; Fourier transforms; Signal processing algorithms; Spectral analysis;
Conference_Titel :
Engineering in Medicine and Biology Society, 1995 and 14th Conference of the Biomedical Engineering Society of India. An International Meeting, Proceedings of the First Regional Conference., IEEE
Conference_Location :
New Delhi
Print_ISBN :
0-7803-2711-X
DOI :
10.1109/RCEMBS.1995.532181
