Optimized Simultaneous Axial Multifocal Imaging via Frequency Multiplexed Focusing

Raphael Abiteboul, Tali Ilovitsh*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


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
Issue number10
StatePublished - 1 Oct 2022


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


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


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