Multi-focus tissue harmonic images obtained with parallel transmit beamforming by means of orthogonal frequency division multiplexing

Libertario Demi, Gabriele Giannini, Alessandro Ramalli, Piero Tortoli, Massimo Mischi

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

2 Citations (Scopus)

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).
Original languageEnglish
Title of host publication2015 IEEE International Ultrasonics Symposium (IUS), 21-24 October 2015, Taipei, Taiwan, 2015
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
Pages1-4
DOIs
Publication statusPublished - 2015

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