Comparison of spatial and temporal averaging on ultrafast imaging in presence of quantization errors

Asraf Mohamed Moubark, Zainab Alomari, Sevan Harput, Steven Freear

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

In compound plane wave imaging (CPWI), multiple plane waves are used to insonify the imaging region with different steering angles. The compounding operation is effectively a spatial averaging filter that reduces the speckles of the image and increases the image contrast and its lateral resolution. Although spatial averaging often improves CPWI image quality, quantization errors which dependent on sampling frequency and element spacing (pitch), introduced during beam steering reduce this improvement. In this study, the effect of spatial and temporal averaging on speckle noise reduction, contrast resolution and spatial resolution in ultrafast ultrasound imaging is evaluated. The overall results from the simulations shows that the maximum effect of quantization errors on speckle noise is 0.18 dB, on the image contrast is 0.27 dB, on axial resolution is 2.38% and finally on lateral resolution is 1.44%. On the other hand, plane wave imaging (PWI) employing temporal averaging technique which is not bound with quantization errors relatively produces high contrast to noise ratio (CNR) and speckle signal to noise ratio (SSNR) at 40 MHz for both centre frequency compared to CPWI.

Original languageEnglish
Title of host publication2015 IEEE International Ultrasonics Symposium, IUS 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479981823
DOIs
Publication statusPublished - 13 Nov 2015
Externally publishedYes
EventIEEE International Ultrasonics Symposium, IUS 2015 - Taipei, Taiwan, Province of China
Duration: 21 Oct 201524 Oct 2015

Other

OtherIEEE International Ultrasonics Symposium, IUS 2015
CountryTaiwan, Province of China
CityTaipei
Period21/10/1524/10/15

Fingerprint

plane waves
image contrast
compounding
beam steering
noise reduction
signal to noise ratios
spatial resolution
sampling
spacing
filters
simulation

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

Cite this

Mohamed Moubark, A., Alomari, Z., Harput, S., & Freear, S. (2015). Comparison of spatial and temporal averaging on ultrafast imaging in presence of quantization errors. In 2015 IEEE International Ultrasonics Symposium, IUS 2015 [7329572] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ULTSYM.2015.0311

Comparison of spatial and temporal averaging on ultrafast imaging in presence of quantization errors. / Mohamed Moubark, Asraf; Alomari, Zainab; Harput, Sevan; Freear, Steven.

2015 IEEE International Ultrasonics Symposium, IUS 2015. Institute of Electrical and Electronics Engineers Inc., 2015. 7329572.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Mohamed Moubark, A, Alomari, Z, Harput, S & Freear, S 2015, Comparison of spatial and temporal averaging on ultrafast imaging in presence of quantization errors. in 2015 IEEE International Ultrasonics Symposium, IUS 2015., 7329572, Institute of Electrical and Electronics Engineers Inc., IEEE International Ultrasonics Symposium, IUS 2015, Taipei, Taiwan, Province of China, 21/10/15. https://doi.org/10.1109/ULTSYM.2015.0311
Mohamed Moubark A, Alomari Z, Harput S, Freear S. Comparison of spatial and temporal averaging on ultrafast imaging in presence of quantization errors. In 2015 IEEE International Ultrasonics Symposium, IUS 2015. Institute of Electrical and Electronics Engineers Inc. 2015. 7329572 https://doi.org/10.1109/ULTSYM.2015.0311
Mohamed Moubark, Asraf ; Alomari, Zainab ; Harput, Sevan ; Freear, Steven. / Comparison of spatial and temporal averaging on ultrafast imaging in presence of quantization errors. 2015 IEEE International Ultrasonics Symposium, IUS 2015. Institute of Electrical and Electronics Engineers Inc., 2015.
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abstract = "In compound plane wave imaging (CPWI), multiple plane waves are used to insonify the imaging region with different steering angles. The compounding operation is effectively a spatial averaging filter that reduces the speckles of the image and increases the image contrast and its lateral resolution. Although spatial averaging often improves CPWI image quality, quantization errors which dependent on sampling frequency and element spacing (pitch), introduced during beam steering reduce this improvement. In this study, the effect of spatial and temporal averaging on speckle noise reduction, contrast resolution and spatial resolution in ultrafast ultrasound imaging is evaluated. The overall results from the simulations shows that the maximum effect of quantization errors on speckle noise is 0.18 dB, on the image contrast is 0.27 dB, on axial resolution is 2.38{\%} and finally on lateral resolution is 1.44{\%}. On the other hand, plane wave imaging (PWI) employing temporal averaging technique which is not bound with quantization errors relatively produces high contrast to noise ratio (CNR) and speckle signal to noise ratio (SSNR) at 40 MHz for both centre frequency compared to CPWI.",
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