Archives of Acoustics, 41, 4, pp. 773–781, 2016
10.1515/aoa-2016-0074

Research and Medical Transcranial Doppler System

Marcin LEWANDOWSKI
Institute of Fundamental Technological Research, Polish Academy of Sciences
Poland

Mateusz WALCZAK
Institute of Fundamental Technological Research, Polish Academy of Sciences
Poland

Piotr KARWAT
Institute of Fundamental Technological Research, Polish Academy of Sciences
Poland

Beata WITEK
Institute of Fundamental Technological Research, Polish Academy of Sciences
Poland

Paweł KARŁOWICZ
Sonomed Sp. z o.o.
Poland

A new ultrasound digital transcranial Doppler system (digiTDS) is introduced. The digiTDS enables diagnosis of intracranial vessels which are rather difficult to penetrate for standard systems. The device can display a color map of flow velocities (in time-depth domain) and a spectrogram of a Doppler signal obtained at particular depth. The system offers a multigate processing which allows to display a number of spectrograms simultaneously and to reconstruct a flow velocity profile.

The digital signal processing in digiTDS is partitioned between hardware and software parts. The hardware part (based on FPGA) executes a signal demodulation and reduces data stream. The software part (PC) performs the Doppler processing and display tasks. The hardware-software partitioning allowed to build a flexible Doppler platform at a relatively low cost.

The digiTDS design fulfills all necessary medical standards being a new useful tool in the transcranial field as well as in heart velocimetry research.
Keywords: Doppler system; digital signal processing; hardware-software partitioning; field programmable gate arrays.
Full Text: PDF

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DOI: 10.1515/aoa-2016-0074

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