Computer analysis of frequency spectrum of a phonothyreogram |
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| Authors: | K J Blinowska M A Czerminska O A Chomicki T Górowski |
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| Institution: | (1) Laboratory of Medical Physics, Institute of Experimental Physics, Warsaw University, Warsaw, Poland;(2) Endocrine Clinics, Centre for Postgraduate Medical Education, Warsaw, Poland |
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| Abstract: | An analysis of phonothyreograms and phonocardiograms was made with the aid of an ND minicomputer and a CYBER 73 computer system
using an electrocardiogram signal as a reference time signal. Programs were written to estimate the power spectral density
function of these signals. In patients with Graves' disease and those with nodular goiter the intrinsic thyroid murmur was
found to differ from the sound transmitted from the heart in healthy subjects by a large contribution of frequencies in the
250–750 Hz range, this factor being particularly pronounced in patients with Graves' disease. |
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| Keywords: | Digital frequency analysis Graves' disease Phonothyreogram Thyroid murmur |
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