Transcranial Beam Steering with Aberration Correction

Osipov, L. V.; Kulberg, N. S.; Skosyrev, S. V.; Leonov, D. V.; Grigorev, G. K.; Vladzimirskiy, A. V.; Морозов, С. П.

doi:10.1007/s10527-021-10057-3

Cited by 5 publications

(4 citation statements)

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“…This superiority can be attributed to the fact that the proposed method corrects multiple angular coordinates using a single data set, eliminating the need for a calibration probe. In contrast, the beacon‐based reference method relied on a calibration probe and achieved the best correction results for the area situated between the probe and the phased array 22 …”

Section: Discussionmentioning

confidence: 99%

“…Firstly, a visual analysis of the temporal bone shape on computed tomography images played a role in this choice. Additionally, an analysis of the phase distortion curves introduced by the temporal bones, estimated using an beacon‐based reference method 22 was taken into consideration. Furthermore, a literature review also contributed to the decision‐making process.…”

Section: Discussionmentioning

confidence: 99%

“…This method 22 it involves the use of two probes, a reference probe and a multi‐element probe. The reference probe is attached to the surface of a phantom opposite to the multi‐element probe.…”

Section: Methodsmentioning

confidence: 99%

“…In such a way, although the emitted signal is defocused, having travelled through the aberrator, it becomes focused, and the first probe will register the greatest field intensity. Some variations of this correction method were reported, 20–22 one of them 22 was used in this study as a reference method, according to which two ultrasonic probes are located in axial alignment: one is used for frame acquisition, while the other acts as a point source to calibrate the focus of the first probe.…”

Section: Introductionmentioning

confidence: 99%

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Aberration correction by polynomial approximation for synthetic aperture ultrasound imaging

Leonov,

Kulberg,

Yakovleva

2024

Medical Physics

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BackgroundPreviously, there has been some work in the field of optical imaging on phase compensation by employing Legendre polynomials as an expansion of the phase function, and this seems to be an appealing unstudied area in the field of ultrasound imaging.PurposeThe paper is devoted to solving one of the problems of enhancing the authenticity of diagnostics data obtained in ultrasound visualization systems and presents a novel approach to aberration correction, which ensures a reliable eliminating of phase distortions. The novelty of the proposed approach consists in the use of the decomposition of the wave front by Legendre polynomials to approximate aberrations of the phase front of ultrasonic waves propagating through distorting layers.MethodsThe phase aberrations are corrected using a single sector probe that captures echoes in synthetic aperture mode. The proposed method approximates the changes in the wave front by means of the Legendre polynomials. The performance was investigated by placing a 13‐mm‐wide ultrasonic probe with 64 elements operating at 2 MHz on the surface of a commercial quality control phantom ATS Model 539 through a distorting layer. The following metrics were measured: peak value, root mean square (RMS), full width at half maximum (FWHM), contrast‐to‐noise ratio (CNR). During the experiments, three different aberrators were used interchangeably as distorting layers, two of which were made of photopolymer resin with RMS values of 39 and 97 ns and a speed of sound close to that of a human temporal bone tissue, and the third was an ex vivo human temporal bone with the RMS value of 44 ns. To test the correction, three regions inside the phantom were examined. Two‐sided nonparametric Wilcoxon rank‐sum test was used for assessing the statistical significance. The significance level for this study was set at α ≤ 0.05. To counteract the problem of multiple comparisons, the p‐values were adjusted by the Holm–Bonferroni correction method.ResultsThe statistically significant results have demonstrated the possibility of increasing peak intensity value up to 3.08 times, reducing the RMS width and FWHM of the intensity angular distribution down to 60% and 82%, respectively, and increasing CNR up to 2.12 times by using the proposed phase distortion correction method, compared with the case without correction. The results show that the method can be used as an effective aberration correction technique for all tested regions inside the phantom and distorting layers. Its usage allowed correcting up to 97% of the aberrations caused by the ex vivo temporal bone model.ConclusionThe results show that the usage of the proposed method for aberration correction can successfully increase the intensity and reduce the angular width of the ultrasound wave scattered by the point targets inside the phantoms. The method works with different distorting layers and is capable of correcting phase aberrations in multiple sections of the sonogram. The limitation of the proposed method consists in the fact that it requires the use of aperture synthesis and access to raw radiofrequency data, which restricts its application in common scanners.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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