Beamforming

Szabo, Thomas L.

doi:10.1016/b978-0-12-396487-8.00006-9

Cited by 10 publications

(2 citation statements)

References 13 publications

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“…About 300 frames of RF data are acquired continuously for a 20 mm long elevational translation at a frame rate of 101 Hz, with an imaging depth of 40 mm and sampling frequency of 40 MHz. According to the specification of probe, the theoretical −6 dB beam widths of a rectangular transducer (Szabo 2004) in the lateral and elevational directions are obtained as 0.39 and 0.75 mm, respectively. Under this condition, the average interframe movement in the elevational direction (i.e.…”

Section: Rf Data Acquisitionmentioning

confidence: 99%

Electromagnetic tracking-based freehand 3D quasi-static elastography with 1D linear array: a phantom study

Lee

He²,

Luo³

2018

Phys. Med. Biol.

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Recent developments in hardware and scanning protocols have advanced conventional 2D quasi-static elastography to 3D level, which provides an intuitive visualization of lesions. A 2D linear array or scanning mechanism is typically required for 3D quasi-static elastography, requiring expensive and specifically designed hardware. In this study, we propose a novel method based on a commercial electromagnetic tracking system for freehand 3D quasi-static elastography with 1D linear array. Phantom experiments are performed to validate the feasibility of the proposed method. During data acquisition, the probe contacts the surface of an elasticity phantom and moves in the elevational direction, while applying sinusoidal-like axial compression to the phantom. For each frame of ultrasound data, the 3D coordinates and orientations of the probe are obtained from an electromagnetic tracking system. A correlation-based algorithm is adopted to obtain a series of axial strain images. Volumetric strain data are reconstructed by using the recorded 3D coordinates and orientations of the probe corresponding to each strain image. The diameters of inclusions are then obtained from the slice plots of the volumetric strain data. The volumes of inclusions are estimated from the isosurface plots. The experimental result shows that the volume estimation of the inclusions has good accuracy, with errors within 2%, while the diameters of the inclusions estimated from three orthogonal planes have larger errors up to 18%. In conclusion, the present framework would promise a reliable and effective solution for freehand 3D quasi-static elastography with 1D linear array.

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Section: Rf Data Acquisitionmentioning

confidence: 99%

Electromagnetic tracking-based freehand 3D quasi-static elastography with 1D linear array: a phantom study

Lee

He²,

Luo³

2018

Phys. Med. Biol.

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“…There are very few applications of ultrasound CT (UCT) scanners due to several technological limitations [2 ]. Error in forward and inverse modelling due to relatively uncertain beam propagation path termed as ray tracing [3, 4 ], limited beam focus versus cost of probes [5, 6 ], instability against surrounding vibrations, and constant renewal requirement of coupling medium are just a few of these. We would like to report our progress made in the direction of making a better 2D UCT system using a pair of focused beam transducers and associated electronics for controlling the mechanical assembly and recording the online data.…”

Section: Introductionmentioning

confidence: 99%

Optimal frequency combination estimation for accurate ultrasound non‐destructive testing

Kumar

Shakya²,

Goswami

2020

Electron. lett.

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A non‐destructive testing system requires multiple system configuration parameters during the operation process. For a given transducer, scanning frequency and number of measurements for averaging are just among those parameters. This work tests the central limit theorem to optimally set these parameters. The authors have designed a compact ultrasound computer tomography scanner from scratch just to test this criterion. It is shown that optimal frequency value changes with respect to the scanning angle for an object with a heterogeneous inner profile. The proposed criterion helps to estimate the multi‐spectral combination before the recovery stage minimum error. Possible industrial applications of such a system are 2D/3D multiphase flow profile recovery or crack detection in the composite matter, non‐invasively.

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