Enhancement of contrast and resolution of B-mode plane wave imaging (PWI) with non-linear filtered delay multiply and sum (FDMAS) beamforming

Moubark, Asraf Mohamed; Alomari, Zainab; Harput, Sevan; Cowell, David M. J.; Freear, Steven

doi:10.1109/ultsym.2016.7728678

Cited by 14 publications

(6 citation statements)

References 10 publications

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“…High CNR value means cyst can be visualize easily and the acoustic noise standard deviation is small or more uniform. Both CR and CNR equation are given by [12] CR(dB) = 20log 10 ( μ cyst μ back )…”

Section: Methodsmentioning

confidence: 99%

New improved unsharp masking methods compatible with ultrasound B-mode imaging

Moubark

Carpenter

Cowell

et al. 2017

2017 IEEE International Ultrasonics Symposium (IUS)

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In medical ultrasound B-mode imaging, by increasing the image contrast, spatial and temporal resolution, it will help to improve the diagnostic and decision making process. Previously the unsharp masking (UM) techniques have been successfully implemented for digital image processing as edge enhancement techniques. However, the outcomes of the method are limited and influenced by the image formats conversion and lower dynamic range. Moreover the conventional UM technique sensitive to noise due to the presence of linear high pass filter which cannot discriminate signal from noise. Furthermore, the technique only enhances the image in darker compared to lighter regions. To overcome those issues, a new improved UM method compatible with ultrasound B-mode imaging was applied to compound plane wave imaging (CPWI). The received radio frequency (RF) signal was beamformed with delay and sum (DAS) and filtered delay and sum (FDMAS). Results show that the proposed techniques are not only able to improve the image contrast but also the spatial resolution. The UM technique manages to improve the B-mode image lateral resolution (LR) by 18.36% and 10.25% as well as reduced the peak side lobes (PSL) by 16.67 dB and 21.24 dB on DAS and FDMAS respectively when compounded with CPWI, N =13. For the same number of compounding and beamforming order, the image contrast ratio (CR) has been improved by 10.35 dB and 7.39 dB accordingly.

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Section: Methodsmentioning

confidence: 99%

New improved unsharp masking methods compatible with ultrasound B-mode imaging

Moubark

Carpenter

Cowell

et al. 2017

2017 IEEE International Ultrasonics Symposium (IUS)

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“…While the image contrast ratio (CR) and contrast-to-noise ratio (CNR) of a 15-mm deep hypoechoic cyst in the phantom was computed. Both CR and CNR equations are given by [12] CR(dB) = 20log 10 ( µ cyst µ back ),…”

Section: Performance Evaluationmentioning

confidence: 99%

A New Nonlinear Compounding Technique for Ultrasound B-mode Medical Imaging

Moubark

Nie

Cowell

et al. 2019

2019 IEEE International Ultrasonics Symposium (IUS)

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Compounding techniques have been used in ultrafast ultrasound imaging to improve image quality by reducing clutter noise, smoothing speckle variance and enhancing its spatial resolution at the cost of reducing frame rate. However, the reduction of clutter noise and side lobes inside the anechoic regions is minimal when combining conventional spatial compounding and delay-and-sum (DAS) beamforming. Despite the availability of advanced beamforming algorithms such as filtereddelay-multiply-and-sum (FDMAS), its prevalence is hindered by relatively high computational cost. In this study, a new nonlinear compounding technique known as filtered multiply and sum (FMAS) was proposed to improve the B-mode image quality without increasing the overall computational complexity. With three compunding angles, the lateral resolution for DAS-FMAS was improved by 36% and 19% compared to DAS and FDMAS. The proposed DAS-FMAS technique also provided improvements of 14.1 dB and 7.29 dB in contrast ratio than DAS and FDMAS.

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“…Numerous methods have been proposed to improve the AR in ultrasound B-mode imaging. They include the use of wideband excitation signals and the employment of pre/post signal processing techniques [ 7 , 8 , 9 , 10 ]. Short excitation pulses, such as a broadband square pulse signal, are able to produce a narrow main lobe along the axial direction.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Ultrasound B-Mode Image Quality Using Nonlinear Filtered-Multiply-and-Sum Compounding for Improved Carotid Artery Segmentation

et al. 2023

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In ultrasound B-mode imaging, the axial resolution (AR) is commonly determined by the duration or bandwidth of an excitation signal. A shorter-duration pulse will produce better resolution compared to a longer one but with compromised penetration depth. Instead of relying on the pulse duration or bandwidth to improve the AR, an alternative method termed filtered multiply and sum (FMAS) has been introduced in our previous work. For spatial-compounding, FMAS uses the autocorrelation technique as used in filtered-delay multiply and sum (FDMAS), instead of conventional averaging. FMAS enables a higher frame rate and less computational complexity than conventional plane-wave compound imaging beamformed with delay and sum (DAS) and FDMAS. Moreover, it can provide an improved contrast ratio and AR. In previous work, no explanation was given on how FMAS was able to improve the AR. Thus, in this work, we discuss in detail the theory behind the proposed FMAS algorithm and how it is able to improve the spatial resolution mainly in the axial direction. Simulations, experimental phantom measurements and in vivo studies were conducted to benchmark the performance of the proposed method. We also demonstrate how the suggested new algorithm may be used in a practical biomedical imaging application. The balloon snake active contour segmentation technique was applied to the ultrasound B-mode image of a common carotid artery produced with FMAS. The suggested method is capable of reducing the number of iterations for the snake to settle on the region-of-interest contour, accelerating the segmentation process.

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Enhancement of contrast and resolution of B-mode plane wave imaging (PWI) with non-linear filtered delay multiply and sum (FDMAS) beamforming

Cited by 14 publications

References 10 publications

New improved unsharp masking methods compatible with ultrasound B-mode imaging

New improved unsharp masking methods compatible with ultrasound B-mode imaging

A New Nonlinear Compounding Technique for Ultrasound B-mode Medical Imaging

Enhancement of Ultrasound B-Mode Image Quality Using Nonlinear Filtered-Multiply-and-Sum Compounding for Improved Carotid Artery Segmentation

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