Improvement of penetration of modified amplitude and phase estimation beamformer

Hideyuki Hasegawa

doi:10.1007/s10396-016-0731-z

Journal of Medical Ultrasonics

January 2017, Volume 44, Issue 1, pp 3–11

Improvement of penetration of modified amplitude and phase estimation beamformer

Authors
Authors and affiliations

Hideyuki HasegawaEmail author

Original Article

First Online:: 21 July 2016

Received:: 24 April 2016
Accepted:: 07 June 2016

127 Downloads

Abstract

Purpose

High-frame-rate ultrasound is the predominant technique for the measurement of tissue dynamics. It enables an imaging frame rate of over 1 kHz using unfocused transmit beams and parallel receive beamforming. On the other hand, the spatial resolution is degraded compared to the conventional method based on sequential transmissions of focused beams. For improvement of the spatial resolution of high-frame-rate ultrasound, we have investigated a kind of adaptive beamformer, i.e., amplitude and phase estimation (APES) beamformer.

Method

In our previous study, it was shown that the APES beamformer realized a significantly better spatial resolution than the conventional delay and sum (DAS) beamformer without sub-array averaging and diagonal loading by considering the directivity of each transducer element. By omitting sub-array averaging and adding sub-aperture beamforming, the computational load could also be reduced significantly. One shortcoming of the proposed APES beamformer with element directivity, i.e., modified APES beamformer, is the degradation of penetration compared with the conventional APES beamformer with sub-array averaging and diagonal loading. In the present study, sub-array averaging and diagonal loading were applied to the modified APES beamformer for the improvement of the penetration.

Results

The conventional and modified APES beamformers realized similar performances when used with sub-array averaging and diagonal loading. Furthermore, the modified APES beamformer realized better spatial resolution and improved penetration when used with sub-aperture beamforming and diagonal loading. The modified APES beamformer with diagonal loading at 0.025 of the received power realized a penetration similar to that of the conventional APES beamformer with sub-array averaging and diagonal loading. The lateral spatial resolutions achieved with the conventional and modified APES beamformers were 0.36 and 0.31 mm, respectively. In addition, the modified APES beamformer could reduce the dimension of the covariance matrix to \(4\times 4\), versus \(48\times 48\) of the conventional APES beamformer, resulting in a computation time of only 1.1 %.

Conclusion

Penetration of the modified APES beamformer could be improved significantly by diagonal loading, which hardly increases the computational complexity.

Keywords

Penetration Spatial resolution Adaptive beamforming High-frame-rate ultrasound

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Authors and Affiliations

Hideyuki Hasegawa
- 1
Email authorView author's OrcID profile

1.Graduate School of Science and EngineeringUniversity of ToyamaToyamaJapan

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Cite this article as:: Hasegawa, H. J Med Ultrasonics (2017) 44: 3. doi:10.1007/s10396-016-0731-z

Improvement of penetration of modified amplitude and phase estimation beamformer

Abstract

Purpose

Method

Results

Conclusion

Keywords

Copyright information

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