Restoration of scatterer distribution based on Empirical Bayesian learning with consideration of statistical properties

Zhu, Jing; Tagawa, Norio

doi:10.1121/2.0000713

Cited by 2 publications

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“…Furthermore, small scatterers within these tissues appear as speckle patterns in B mode images and are useful not only for diagnosis of the tissue characteristics but also for image processing operations, such as motion analysis. We are currently investigating a method for use with small scatterers based on empirical Bayes deconvolution [12]. By combining this method with the SA-SCM, it will be possible to realize a new imaging scheme.…”

Section: Discussionmentioning

confidence: 99%

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Improvement of Performance Degradation in Synthetic Aperture Extension of Enhanced Axial Resolution Ultrasound Imaging Based on Frequency Sweep

Zhu

Tagawa

2019

Sensors

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We are studying a method based on the carrier frequency sweep for axial high resolution ultrasonic imaging to provide the range resolution that corresponds to the carrier wavelength. The first proposal for this type of method was based on the focused pulse transmission. Then, to improve the frame rate, the method was extended to a synthetic aperture-type method that transmits divergent pulses. While the method is effective in terms of the frame rate, degradation of the enhanced axial resolution performance is a concern. Therefore, using finite element method simulations and simple experiments, the performance of the synthetic aperture method with high axial resolution is evaluated via comparison with the original method using focused pulses. The evaluation confirmed that the performance degradation of the synthetic aperture method is caused by weakness in the transmitted wave intensity and deterioration of the phase coherence in the reception beamforming. Based on this result, we propose a method that is less affected by the latter cause and show its effectiveness.

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Section: Discussionmentioning

confidence: 99%

“…This echo formulation is suitable for spatially-discrete scatterers. It is more appropriate to model small scatterers in living tissue to be distributed at all locations, and we also examined methods based on such a formulation [12].…”

Section: Axial High Resolution Methods Based On Frequency Sweepmentioning

confidence: 99%

Improvement of Performance Degradation in Synthetic Aperture Extension of Enhanced Axial Resolution Ultrasound Imaging Based on Frequency Sweep

Zhu

Tagawa

2019

Sensors

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High resolution ultrasonic imaging based on frequency sweep in both of transducer element domain and imaging line domain

Zhu

Tagawa

2019

Jpn. J. Appl. Phys.

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We developed the super resolution FM-chirp correlation method (SCM) and its high frame rate version called synthetic aperture-SCM (SA-SCM) based on frequency sweep in order to improve the range resolution in ultrasound imaging. However, in these methods, discontinuities in the lateral direction tend to occur, because the SCM processing is performed line by line in the image. In addition, in array transducers, grating lobes are more likely to occur when the spatial resolution is increased using high-frequencies. Therefore, another version called SCM-weighted SA was proposed. In the SCM-weighted SA, in order to avoid the lateral discontinuities, first the SCM processing is performed on each echo received by each transducer element, and then the obtained SCM result is used as a weight for SA processing. The SCM-weighted SA can generate multiple B-mode images each of which corresponds to each carrier frequency, and the appropriate low frequency images among them have no grating lobes. While this plurality of B-mode images can be used as multi-frequency images, it can also be integrated as one high SNR image. In the present study, we propose a method to generate the integrated one B-mode image by applying SCM again in the line direction of the obtained multi-frequency images, which is called SCM-weighted SA-SCM. This method can further improve the range resolution.

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Restoration of scatterer distribution based on Empirical Bayesian learning with consideration of statistical properties

Cited by 2 publications

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Improvement of Performance Degradation in Synthetic Aperture Extension of Enhanced Axial Resolution Ultrasound Imaging Based on Frequency Sweep

Improvement of Performance Degradation in Synthetic Aperture Extension of Enhanced Axial Resolution Ultrasound Imaging Based on Frequency Sweep

High resolution ultrasonic imaging based on frequency sweep in both of transducer element domain and imaging line domain

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