Syracuse

A New High Channels Density Ultrasound Platform for Advanced 4D Cardiac Imaging

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Petrusca, Lorena | Varray, Francois | Souchon, Rémi | Bernard, Adeline | Chapelon, Jean-Yves | Liebgott, Hervé | N'Djin, William Apoutou | Viallon, Magalie

Edité par CCSD -

International audience. Background, Motivation and ObjectiveA novel ultrasound (US) platform with high channels density that offers flexibility, precision and open access is a pre-requisite to open new frontiers in diagnostic and/or therapy by experimental implementation of new enabled advanced techniques: dual-mode US imaging/therapies in the heart, new approaches to study the myocardial tissue (structure/characterization), fast sparse array strategies, multi-line transmit (MLT), powerful motion correction strategies. To date few systems in the world permit to have a full control both in transmit and receive of all single elements simultaneously of arrays with more than 1000 transducers. This paper presents a powerful US platform for implementing 4D (real-time 3D) advanced US strategies.Statement of Contribution/MethodsAn US platform was developed including a 1024-element US prototype designed for 4D cardiac dual-mode US imaging/therapy (Vermon, 2D 32x32 planar phased-array transducer, fc = 3.4 MHz) and a high channels density (1024-channels) US scanner, made of 4 256-Vantage systems (Verasonics) synchronized together (Fig1e). These systems have per-channel arbitrary waveform transmit/receive generation capability with easy access to RF data. The physical addressing of each US element was properly chosen for allowing various array sparsity combinations while minimizing the number of Vantage driving systems needed. Numerical simulations of US imaging were performed and experimental data of identical configuration were acquired to compare full and sparse array strategies, testing 4D imaging sequences and reconstruction processes.Results/DiscussionReal-time 4D US imaging was successfully performed in full array mode by synchronizing in emission/reception up to 1024 elements independently. The modular US platform could be reconfigured depending on the number of available Vantage (1 to 4 systems) allowing to use dense halves/quarters of the array, or downsampled full array (Fig1b-d). The validationof image sequences involved plane, diverging and focused waves (SPW, SDW, MLT) and the technical feasibility of real-time 4D US for low therapy focused US and imaging was confirmed with this 1024-channels density US system, offering full research access for developing advanced US strategies.

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