Parallel beamforming in transmit (PBT) by means of orthogonal frequency division multiplexing (OFDM) was recently applied to increase the frame rate of ultrasound tissue harmonic imaging. OFDM-PBT improves the data acquisition rate by generating, for each transmission event, multiple beams that are allocated to a specific portion of the available transducer bandwidth. Improving the frame rate is however not the only possible application of an increased data acquisition rate. In this paper, OFDM-PBT is exploited to perform multi-focus tissue harmonic imaging for improving the penetration depth and signal to noise ratio (SNR) without affecting the frame rate. Tissue harmonic images of a tissue mimicking phantom were obtained with OFDM-PBT and standard B-mode imaging. Results present improved penetration depth and SNR for OFDM-PBT as compared to standard B-mode. We estimated an improvement of 6 dB of the average SNR, at the expenses of a reduction of the axial resolution (0.7 vs 1.1 mm).
Multi-Focus Tissue Harmonic Images Obtained with Parallel Transmit Beamforming by means of Orthogonal Frequency Division Multiplexing / Demi, Libertario; Giannini, Gabriele; Ramalli, Alessandro; Tortoli, Piero; Mischi, Massimo. - ELETTRONICO. - (2015), pp. 1-4. (Intervento presentato al convegno 2015 IEEE International Ultrasonics Symposium (IUS) tenutosi a Taipei - Taiwan nel October 2015) [10.1109/ULTSYM.2015.0501].
Multi-Focus Tissue Harmonic Images Obtained with Parallel Transmit Beamforming by means of Orthogonal Frequency Division Multiplexing
GIANNINI, GABRIELE;RAMALLI, ALESSANDRO;TORTOLI, PIERO;
2015
Abstract
Parallel beamforming in transmit (PBT) by means of orthogonal frequency division multiplexing (OFDM) was recently applied to increase the frame rate of ultrasound tissue harmonic imaging. OFDM-PBT improves the data acquisition rate by generating, for each transmission event, multiple beams that are allocated to a specific portion of the available transducer bandwidth. Improving the frame rate is however not the only possible application of an increased data acquisition rate. In this paper, OFDM-PBT is exploited to perform multi-focus tissue harmonic imaging for improving the penetration depth and signal to noise ratio (SNR) without affecting the frame rate. Tissue harmonic images of a tissue mimicking phantom were obtained with OFDM-PBT and standard B-mode imaging. Results present improved penetration depth and SNR for OFDM-PBT as compared to standard B-mode. We estimated an improvement of 6 dB of the average SNR, at the expenses of a reduction of the axial resolution (0.7 vs 1.1 mm).File | Dimensione | Formato | |
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Multi-focus tissue harmonic images obtained with parallel transmit beamforming by means of orthogonal frequency division.pdf
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