Optimized Simultaneous Axial Multifocal Imaging via Frequency Multiplexed Focusing

Raphael Abiteboul, Tali Ilovitsh

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Simultaneous axial multifocal imaging (SAMI) using a single acoustical transmission was developed to enhance the depth of field. This technique transmits a superposition of axial multifoci waveforms in a single transmission, thus increasing the frame rate. However, since all the waveforms are transmitted at a constant center frequency, there is a tradeoff between attenuation and lateral resolution when choosing a constant frequency for all the axial depths. In this work, we developed an optimized SAMI method by adding frequency dependence to each axial multifocus. By gradually increasing the frequency as a function of the focal depth, this method makes it possible to compensate for the gradually increasing F-number in order to achieve constant lateral resolution across the entire field of view. Alternatively, by gradually decreasing the axial multifoci frequencies as a function of depth, enhanced penetration depth and contrast are obtained. This method, termed frequency multiplexed SAMI (FM-SAMI), is described analytically and validated by resolution and contrast experiments performed on resolution targets, tissue-mimicking phantoms, and ex vivo biological samples. This is the first real-time implementation of a frequency multiplexing approach for axial multifoci imaging that facilitates high-quality imaging at an increased frame rate.

Original languageEnglish
Pages (from-to)2930-2942
Number of pages13
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume69
Issue number10
DOIs
StatePublished - 1 Oct 2022
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 1986-2012 IEEE.

Funding

This work was supported in part by Israel Science Foundation under Grant 3450/20, in part by the Israel Ministry of Science and Technology under Grant 101716, in part by Zimin Institute Grant, and in part by the Nicholas and Elizabeth Slezak Super Center for Cardiac Research and Biomedical Engineering at Tel Aviv University.

FundersFunder number
Zimin Institute
Israel Science Foundation3450/20
Tel Aviv University
Ministry of science and technology, Israel101716
Nicholas and Elizabeth Slezak Super Center for Cardiac Research and Biomedical Engineering

    Keywords

    • Beamforming
    • frame rate
    • frequency multiplexing
    • multifoci
    • ultrasound imaging

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