Research & Medical Doppler platform

Marcin Lewandowski , Mateusz Walczak , Piotr Karwat , Beata Witek , Andrzej Nowicki , Paweł Karłowicz

A new ultrasound digital transcranial Doppler system (digiTDS) is introduced. The digiTDS enables the diagnosis of intracranial vessels and the assessment of the blood flow. The device can display a color map of flow velocities in time-depth domain and a spectrogram of Doppler signal obtained at a selected depth. The system offers the multigate processing which allows to display simultaneously a number of spectrograms and to reconstruct a flow velocity profile. The digital signal processing in the digiTDS is divided between hardware and software. The hardware part, based on the FPGA, executes a signal demodulation and reduces the data stream. The software part, executed on the PC, performs the Doppler processing and the visualization. The hardware-software partitioning enables building of a flexible Doppler platform at a relatively low cost. The detailed description of the system internals and the algorithm optimization are presented. The digiTDS is a new useful tool for transcranial applications as well as in general Doppler research. Its design fulfills all required medical standards, so it can be used both in laboratory and clinical practice.

Mots clés: Doppler system; digital signal processing; hardware-software partitioning; field programmable gate arrays

Domaines: Acoustique [physics.class-ph]

Marcin Lewandowski, Mateusz Walczak, Piotr Karwat, Beata Witek, Andrzej Nowicki, et al.. Research & Medical Doppler platform. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00810967⟩