Imaging Performance for Two Row–Column Arrays

Research output: Contribution to journalJournal article – Annual report year: 2019Researchpeer-review

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Imaging Performance for Two Row–Column Arrays. / Bouzari, Hamed; Engholm, Mathias; Nikolov, Svetoslav Ivanov; Stuart, Matthias Bo; Thomsen, Erik Vilain; Jensen, Jørgen Arendt.

In: IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, Vol. 66, No. 7, 2019, p. 1209-1221.

Research output: Contribution to journalJournal article – Annual report year: 2019Researchpeer-review

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@article{9c9a98e3a27741118b580af7c4b67082,
title = "Imaging Performance for Two Row–Column Arrays",
abstract = "This study evaluates the volumetric imaging performance of two prototyped 62+62 row–column-addressed (RCA) 2-D array transducer probes using three Synthetic Aperture Imaging (SAI) emission sequences and two different beamsformers. The probes are fabricated using capacitive micromachined ultrasonic transducer (CMUT), and piezoelectric transducer (PZT) technology. Both have integrated apodization to reduce ghost echoes and are designed with similar acoustical features i.e., 3MHz center frequency, l/2-pitch, and 24.8×24.8mm2 active footprint. Raw RF data are obtained using an experimental research ultrasound scanner, SARUS. The SAI sequences are designed for imaging down to 14 cm at a volume rate of 88 Hz. Two beamforming methods: Spatial matched filtering and rowcolumn adapted delay-and-sum are used for beamforming the RF data. The imaging quality is investigated through simulations and phantom measurements. Both probes on average have similar lateral full-width at half-maximum (FWHM) values, but the PZT probe has 20{\%} smaller cystic resolution values and 70{\%} larger contrast-to-noise ratio compared to the CMUT probe. The CMUT probe can penetrate down to 15 cm, and the PZT probe down to 30 cm. The CMUT probe has 17{\%} smaller axial FWHM values. The matched filter focusing shows and improved B-mode image for measurements on a cyst phantom with an improved speckle pattern and better visualization of deeper lying cysts. The results of this study demonstrate the potentials of RCA 2-D arrays against fully addressed 2-D arrays, which are low channel count (e.g. 124 instead of 3,844), low acoustic intensity (MI ≤0.88 and Ispta ≤5.5mW/cm2), and high penetration depth (down to 30 cm), which makes 3-D imaging at high volume rates possible with equipment in the price range of conventional 2-D imaging.",
keywords = "3-D imaging, Beamforming, Row-column arrays, Volumetric ultrasound imaging",
author = "Hamed Bouzari and Mathias Engholm and Nikolov, {Svetoslav Ivanov} and Stuart, {Matthias Bo} and Thomsen, {Erik Vilain} and Jensen, {J{\o}rgen Arendt}",
year = "2019",
doi = "10.1109/TUFFC.2019.2914348",
language = "English",
volume = "66",
pages = "1209--1221",
journal = "I E E E Transactions on Ultrasonics, Ferroelectrics and Frequency Control",
issn = "0885-3010",
publisher = "Institute of Electrical and Electronics Engineers",
number = "7",

}

RIS

TY - JOUR

T1 - Imaging Performance for Two Row–Column Arrays

AU - Bouzari, Hamed

AU - Engholm, Mathias

AU - Nikolov, Svetoslav Ivanov

AU - Stuart, Matthias Bo

AU - Thomsen, Erik Vilain

AU - Jensen, Jørgen Arendt

PY - 2019

Y1 - 2019

N2 - This study evaluates the volumetric imaging performance of two prototyped 62+62 row–column-addressed (RCA) 2-D array transducer probes using three Synthetic Aperture Imaging (SAI) emission sequences and two different beamsformers. The probes are fabricated using capacitive micromachined ultrasonic transducer (CMUT), and piezoelectric transducer (PZT) technology. Both have integrated apodization to reduce ghost echoes and are designed with similar acoustical features i.e., 3MHz center frequency, l/2-pitch, and 24.8×24.8mm2 active footprint. Raw RF data are obtained using an experimental research ultrasound scanner, SARUS. The SAI sequences are designed for imaging down to 14 cm at a volume rate of 88 Hz. Two beamforming methods: Spatial matched filtering and rowcolumn adapted delay-and-sum are used for beamforming the RF data. The imaging quality is investigated through simulations and phantom measurements. Both probes on average have similar lateral full-width at half-maximum (FWHM) values, but the PZT probe has 20% smaller cystic resolution values and 70% larger contrast-to-noise ratio compared to the CMUT probe. The CMUT probe can penetrate down to 15 cm, and the PZT probe down to 30 cm. The CMUT probe has 17% smaller axial FWHM values. The matched filter focusing shows and improved B-mode image for measurements on a cyst phantom with an improved speckle pattern and better visualization of deeper lying cysts. The results of this study demonstrate the potentials of RCA 2-D arrays against fully addressed 2-D arrays, which are low channel count (e.g. 124 instead of 3,844), low acoustic intensity (MI ≤0.88 and Ispta ≤5.5mW/cm2), and high penetration depth (down to 30 cm), which makes 3-D imaging at high volume rates possible with equipment in the price range of conventional 2-D imaging.

AB - This study evaluates the volumetric imaging performance of two prototyped 62+62 row–column-addressed (RCA) 2-D array transducer probes using three Synthetic Aperture Imaging (SAI) emission sequences and two different beamsformers. The probes are fabricated using capacitive micromachined ultrasonic transducer (CMUT), and piezoelectric transducer (PZT) technology. Both have integrated apodization to reduce ghost echoes and are designed with similar acoustical features i.e., 3MHz center frequency, l/2-pitch, and 24.8×24.8mm2 active footprint. Raw RF data are obtained using an experimental research ultrasound scanner, SARUS. The SAI sequences are designed for imaging down to 14 cm at a volume rate of 88 Hz. Two beamforming methods: Spatial matched filtering and rowcolumn adapted delay-and-sum are used for beamforming the RF data. The imaging quality is investigated through simulations and phantom measurements. Both probes on average have similar lateral full-width at half-maximum (FWHM) values, but the PZT probe has 20% smaller cystic resolution values and 70% larger contrast-to-noise ratio compared to the CMUT probe. The CMUT probe can penetrate down to 15 cm, and the PZT probe down to 30 cm. The CMUT probe has 17% smaller axial FWHM values. The matched filter focusing shows and improved B-mode image for measurements on a cyst phantom with an improved speckle pattern and better visualization of deeper lying cysts. The results of this study demonstrate the potentials of RCA 2-D arrays against fully addressed 2-D arrays, which are low channel count (e.g. 124 instead of 3,844), low acoustic intensity (MI ≤0.88 and Ispta ≤5.5mW/cm2), and high penetration depth (down to 30 cm), which makes 3-D imaging at high volume rates possible with equipment in the price range of conventional 2-D imaging.

KW - 3-D imaging

KW - Beamforming

KW - Row-column arrays

KW - Volumetric ultrasound imaging

U2 - 10.1109/TUFFC.2019.2914348

DO - 10.1109/TUFFC.2019.2914348

M3 - Journal article

VL - 66

SP - 1209

EP - 1221

JO - I E E E Transactions on Ultrasonics, Ferroelectrics and Frequency Control

JF - I E E E Transactions on Ultrasonics, Ferroelectrics and Frequency Control

SN - 0885-3010

IS - 7

ER -