Transverse oscillation tensor velocity imaging using a row–column addressed array: Experimental validation

Jorgensen, Lasse Thurmann; Stuart, Matthias Bo; Jensen, Jørgen Arendt

doi:10.1016/j.ultras.2023.106962

Cited by 4 publications

(2 citation statements)

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“…These videos show the acquisition of moving particles in water and tissue motion in a carotid artery phantom during multiple pump cycles. See [41] for a detailed description of the carotid artery phantom setup.…”

Section: Evaluation Setupmentioning

confidence: 99%

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Row–Column Beamformer for Fast Volumetric Imaging

Jorgensen

Praesius

Stuart

et al. 2023

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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This work presents a beamforming procedure that significantly reduces the number of operations when performing volumetric synthetic aperture imaging with row-column addressed arrays (RCAs). The proposed beamformer uses that the image values along the elevation direction of the low-resolution volume (LRV) are approximately constant. It is thus hypothesized that the entire LRV could be reconstructed from a single 2-D cross-section of the LRV. The presented method contains two stages; The first stage beamforms, for each emission, a crosssection using the conventional RCA beamformer. The second stage extrapolates the rest of the image points in the volume from the 2-D cross-sections. Assuming the image volume is covered by 3-D grid coordinates with a size of Nw × Nw × Nz, i.e., Nw samples along the x-and y-axis and Nz samples along the z-axis, the proposed beamformer reduces the number of mathematical operations by a factor of approximately N Nw/(N S + Nw). Here S is the ratio between the first and second stage axial sampling rate, and N is the receiving aperture's number of channels. Beamforming a 128 × 128 × 1024 volume from data acquired with N = 128 receiving channel can thus be achieved with 25.6 times fewer operations, when S = 4.A 9.23 times increase in the beamforming rate for a 100 × 100 × 200 volume with S = 2 was demonstrated on complex data from a 128 + 128 Vermon RCA probe. Real-time volumetric beamformation can, with this increase, be performed with a pulse repetition frequency of up to 1804.80 Hz.The proposed and conventional beamformer's output was visually indistinguishable and, the full width at half maximum (FWHM) and full width at tenth maximum (FWTM) were at most 1.19% larger with the proposed approach.The proposed beamformer can thus perform volumetric imaging significantly faster than the current approach, with a negligible difference in image quality.

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Section: Evaluation Setupmentioning

confidence: 99%

“…The applied flow acquisition sequence was identical to the sequence used in [41]. This sequence contains 32 unique emission sources, transmitted from the Vermon RCA probe with a center frequency of 3 MHz at f prf = 10 kHz.…”

Section: B Phase Similaritymentioning

confidence: 99%