Preliminary comparison of 3D synthetic aperture imaging with Explososcan

Rasmussen, Morten Fischer; Hansen, Jens Munk; Férin, Guillaume; Dufait, R.; Jensen, Jørgen Arendt

doi:10.1117/12.913925

Cited by 5 publications

(4 citation statements)

References 12 publications

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“…The ultrasound beam is electronically controlled and received signals are combined with coherent compounding. Synthetic aperture imaging [13,14], which consists of sequentially emitting and/or receiving with different array-element subsets, can be used when the number of array elements is larger than the number of transmit/receive channels. Planar array technology has attracted a lot of attention because it enables high-rate imaging of whole volumes and thereby enables advanced imaging modes throughout the volumes such as elastography [11], ultrafast Doppler [15], and super-resolution ultrasound imaging [16].…”

Section: Introductionmentioning

confidence: 99%

High-Contrast and -Resolution 3-D Ultrasonography with a Clinical Linear Transducer Array Scanned in a Rotate-Translate Geometry

et al. 2021

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We proposed a novel solution for volumetric ultrasound imaging using single-side access 3-D synthetic aperture scanning of a clinical linear array. This solution is based on an advanced scanning geometry and a software-based ultrasound platform. The rotate-translate scanning scheme increases the elevation angular aperture by pivoting the array (−45° to 45°) around its array axis (axis along the row of its elements) and then scans the imaged object for each pivoted angle by translating the array perpendicularly to the rotation axis. A theoretical basis is presented so that the angular and translational scan sampling periods can be best adjusted for any linear transducer array. We experimentally implemented scanning with a 5-MHz array. In vitro characterization was performed with phantoms designed to test resolution and contrast. Spatial resolution assessed based on the full-width half-maximum of images from isolated microspheres was increased by a factor of 3 along the translational direction from a simple translation scan of the array. Moreover, the resolution was uniform over a cross-sectional area of 4.5 cm2. Angular sampling periods were optimized and tapered to decrease the scan duration while maintaining image contrast (contrast at the center of a 5-mm cyst on the order of −26 dB for 4° angular period and a scan duration of 10 s for a 9-cm3 volume). We demonstrated that superior 3-D ultrasound imaging can be obtained with a clinical array using our scanning strategy. This technique offers a promising and flexible alternative to development of costly matrix arrays toward the development of sensitive volumetric ultrasonography.

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Section: Introductionmentioning

confidence: 99%

High-Contrast and -Resolution 3-D Ultrasonography with a Clinical Linear Transducer Array Scanned in a Rotate-Translate Geometry

et al. 2021

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“…Hereby, any delay or apodization scheme can be applied, offering maximum control and flexibility in the image processing. [2][3][4] However, addressing each element individually results in a vast amount of interconnections and offers a great challenge in acquiring and processing the large amount of data. Reducing the number of transducer elements by using sparse arrays has therefore seen a great amount of interest in the last couple of decades.…”

Section: Introductionmentioning

confidence: 99%

3D ultrasound imaging performance of a row-column addressed 2D array transducer: a simulation study

Rasmussen

Jensen

2013

SPIE Proceedings

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This paper compares the imaging performance of a 128 +128 element row-column addressed array with a fully addressed 16×16 2D array. The comparison is made via simulations of the point spread function with Field II. Both arrays have lambda-pitch, a center frequency of 3.5 MHz and use 256 active elements. The row-column addressed array uses 128 transmit channels and 128 receive channels, whereas the fully addressed array uses 256 channels in both transmit and receive. The large size of the emulated row and column elements in the row-column addressed array causes ghost echoes to appear. The ghost echoes are shown to be suppressed when the sub-elements within each of the emulated row and column elements are apodized. The maximum ghost intensity is suppressed by 22.2 dB compared to using no apodization. With apodization applied, the full-width-at-half-maximum in the lateral direction for the fully addressed array is 2.81 mm, and 1.01 mm for the row-column addressed array. This shows that the detail resolution can be more than doubled using the row-column addressed array instead of the fully addressed array. The row column addressed array achieves a R 20 dB cystic resolution of 0.76 mm, compared to 3.16 mm for the fully addressed array. The significantly smaller R 20 dB -value for the row-column addressed array indicates that it can achieve a much higher contrast resolution than the fully addressed array.

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“…Earlier work by the authors investigated the performance of 3D SAI and Explososcan using simulations [3]. In this paper, the imaging quality of SAI and Explososcan is investigated and compared using phantom measurements.…”

Section: Introductionmentioning

confidence: 99%

Comparison of 3D synthetic aperture imaging and explososcan using phantom measurements

Rasmussen

Férin

Dufait

et al. 2012

2012 IEEE International Ultrasonics Symposium

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Abstract-In this paper, initial 3D ultrasound measurements from a 1024 channel system are presented. Measurements of 3D Synthetic aperture imaging (SAI) and Explososcan are presented and compared. Explososcan is the 'gold standard' for real-time 3D medical ultrasound imaging. SAI is compared to Explososcan by using tissue and wire phantom measurements. The measurements are carried out using a 1024 element 2D transducer and the 1024 channel experimental ultrasound scanner SARUS. To make a fair comparison, the two imaging techniques use the same number of active channels, the same number of emissions per frame, and they emit the same amount of energy per frame. The measurements were performed with parameters similar to standard cardiac imaging, with 256 emissions to image a volume spanning 90• × 90• and 150 mm in depth. This results in a frame rate of 20 Hz. The number of active channels is set to 316 from the design of Explososcan. From wire phantom measurements the point spread functions of both techniques were measured. At 40 mm depth Explososcan achieves a main lobe width (FWHM) of 2.5 mm while SAI's FWHM is 2.2 mm. At 80 mm the FWHM is 5.2 mm for Explososcan and 3.4 mm for SAI, which is a difference of 35 %. Another metric used on the PSF is the cystic resolution, which expresses the ability to detect anechoic cysts in a uniform scattering media. SAI improved the cystic resolution, R 20dB , at 40 mm depth from 4.5 mm to 1.7 mm and at 80 mm from 8.2 mm to 2.8 mm, compared to Explososcan. The speckle pattern looked better for SAI compared to Explososcan's spatial shift variant speckle pattern.

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Preliminary comparison of 3D synthetic aperture imaging with Explososcan

Cited by 5 publications

References 12 publications

High-Contrast and -Resolution 3-D Ultrasonography with a Clinical Linear Transducer Array Scanned in a Rotate-Translate Geometry

High-Contrast and -Resolution 3-D Ultrasonography with a Clinical Linear Transducer Array Scanned in a Rotate-Translate Geometry

3D ultrasound imaging performance of a row-column addressed 2D array transducer: a simulation study

Comparison of 3D synthetic aperture imaging and explososcan using phantom measurements

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