A Weighted Non-Linear Beamformer for Synthetic Aperture Ultrasound Imaging

Vayyeti, Anudeep; Thittai, Arun K.

doi:10.1109/ius46767.2020.9251413

Cited by 7 publications

(1 citation statement)

References 22 publications

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“…This approach was applied for vector flow ultrasound imaging. In [5] the authors proposed the use of the apodization stage after the delay beamforming stage. Their method was applied to the Synthetic Transmit Aperture (STA) technique.…”

Section: Introductionmentioning

confidence: 99%

Coupled Apodization Functions Applied to Enhance Image Quality in Ultrasound Imaging using Phased Arrays

Hechkel¹,

Maaref²,

Hassen³

2021

Adv. sci. technol. eng. syst. j.

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The remarkable presence of side lobes levels in ultrasound B-mode imaging significantly decreases the image quality. Therefore, the use of an apodization function is of great importance. Linear windowing functions are among the most efficient techniques used to optimize antenna directivity by suppression of the side lobes. However, the apodization causes the degradation of lateral resolution by elevating the main lobe width. A new apodization approach that couples a linear windowing technique, and a non-linear windowing technique has been suggested. In this paper, a new dynamic apodization technique called "Dynamic Triangular Apodization" (DTA) is proposed. It enables nonlinear windowing for each imaging direction. In addition, the effectiveness of a hybrid method that combines the Hanning window with the DTA algorithm is evaluated. In order to validate the proposed method, two types of simulation are carried out; namely point spread function and cyst phantom simulation. In the point spread function simulation, the main lobe width of the dual-apodization algorithm is very similar to that of the rectangular window and at the same time, the side lobes levels are significantly reduced. In the cyst target simulation, the Contrast to Noise Ratio (CNR) values of the dual apodization are significantly improved. The performance of the non-linear apodization is numerically investigated. In comparison with the rectangular window, the non-linear apodization method called DTA-Hann maintains low side lobes levels without altering the main lobe width. Consequently, it is a promising technique that aims to ameliorate the image quality.

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Section: Introductionmentioning

confidence: 99%

Coupled Apodization Functions Applied to Enhance Image Quality in Ultrasound Imaging using Phased Arrays

Hechkel¹,

Maaref²,

Hassen³

2021

Adv. sci. technol. eng. syst. j.

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Optimally-weighted non-linear beamformer for conventional focused beam ultrasound imaging systems

Vayyeti

Thittai

2021

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A novel non-linear beamforming method, namely, filtered delay optimally-weighted multiply and sum (F-DowMAS) beamforming is reported for conventional focused beamforming (CFB) technique. The performance of F-DowMAS was compared against delay and sum (DAS), filtered delay multiply and sum (F-DMAS), filtered delay weight multiply and sum (F-DwMAS) and filter delay Euclidian weighted multiply and sum (F-DewMAS) methods. Notably, in the proposed method the optimal adaptive weights are computed for each imaging point to compensate for the effects due to spatial variations in beam pattern in CFB technique. F-DowMAS, F-DMAS, and DAS were compared in terms of the resulting image quality metrics, Lateral resolution (LR), axial resolution (AR), contrast ratio (CR) and contrast-to-noise ratio (CNR), estimated from experiments on a commercially available tissue-mimicking phantom. The results demonstrate that F-DowMAS improved the AR by 57.04% and 46.95%, LR by 58.21% and 53.40%, CR by 67.35% and 39.25%, and CNR by 44.04% and 30.57% compared to those obtained using DAS and F-DMAS, respectively. Thus, it can be concluded that the newly proposed F-DowMAS outperforms DAS and F-DMAS. As an aside, we also show that the optimal weighting strategy can be extended to benefit DAS.

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Euclidian-Weighted Non-linear Beamformer for Conventional Focused Beam Ultrasound Imaging Systems

Vayyeti

Thittai

2021

2021 43rd Annual International Conference of the IEEE Engineering in Medicine &Amp; Biology Society (EMBC)

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A Weighted Non-Linear Beamformer for Synthetic Aperture Ultrasound Imaging

Cited by 7 publications

References 22 publications

Coupled Apodization Functions Applied to Enhance Image Quality in Ultrasound Imaging using Phased Arrays

Coupled Apodization Functions Applied to Enhance Image Quality in Ultrasound Imaging using Phased Arrays

Optimally-weighted non-linear beamformer for conventional focused beam ultrasound imaging systems

Euclidian-Weighted Non-linear Beamformer for Conventional Focused Beam Ultrasound Imaging Systems

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