Preliminary study on the separation of specular reflection and backscattering components using synthetic aperture beamforming

Nagaoka, Ryo; Wilhjelm, Jens E.; Hasegawa, Hideyuki

doi:10.1007/s10396-020-01038-2

Cited by 9 publications

(8 citation statements)

References 31 publications

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“…However, in this context it is worthwhile reiterating the limitations of existing software based efforts towards imaging specular imaging in the literature [20,21,[49][50][51] to further appreciate the relevance of the presented study. As previously discussed, much of these efforts are attributed to receive beamforming.…”

Section: Discussionmentioning

confidence: 94%

“…Enhanced specular imaging has been achieved with modified receive beamforming techniques in [20,21] but are seen to suppress the surrounding tissue information. A study to separate specular and diffuse scattering components in the US received signal with synthetic aperture transmissions has been investigated in [50]. However, the method is very preliminary and does not incorporate for inclined reflectors which is imperative for needle tracking applications.…”

Section: Discussionmentioning

confidence: 99%

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On the physics of ultrasound transmission for in-plane needle tracking in guided interventions

Malamal

Panicker

2023

Biomed. Phys. Eng. Express

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Objective. In ultrasound (US) guided interventions, the accuratevisualization and tracking of needles is a critical challenge, particularly during in-plane insertions. An inaccurate identification and localization of needles lead tosevere inadvertent complications and increased procedure times. This is due tothe inherent specular reflections from the needle with directivity depending on theangle of incidence of the US beam, and the needle inclination. Approach. Thoughseveral methods have been proposed for improved needle visualization, a detailedstudy emphasizing the physics of specular reflections resulting from the interaction oftransmitted US beam with the needle remains to be explored. In this work, we discussthe properties of specular reflections from planar and spherical wave US transmissionsrespectively through multi-angle plane wave (PW) and synthetic transmit aperture(STA) techniques for in-plane needle insertion angles between 15-50°. Main Results.The qualitative and quantitative results from simulations and experiments reveal thatthe spherical waves enable better visualization and characterization of needles thanplanar wavefronts. The needle visibility in PW transmissions is severely degradedby the receive aperture weighting during image reconstruction than STA due togreater deviation in reflection directivity. It is also observed that the spherical wavecharacteristics starts to alter to planar characteristics due to wave divergence at largeneedle insertion depths. Significance. The study highlights that synergistic transmit-receive imaging schemes addressing the physical properties of reflections from thetransmit wavefronts are imperative for the precise imaging of needle interfaces andhence have strong potential in elevating the quality of outcomes from US guidedinterventional practices.

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Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

On the physics of ultrasound transmission for in-plane needle tracking in guided interventions

Malamal

Panicker

2023

Biomed. Phys. Eng. Express

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“…In the experiment using a point scatterer, a difference of 8 dB was confirmed when Bmode images were created using reflection and backscattering components. 27) In addition, the coefficient of variation calculated by the standard deviation of the backscattered component and the mean value of the reflected component was correlated with the roughness in the experiment conducted using phantoms. 28) On the other hand, this method requires a number of transmit-receive events to generate a Bmode image, and it would be preferable to acquire a full dataset with a few transmit-receive events for a moving target like an arterial wall.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of reflection and backscattering components by plane wave imaging for estimation of surface roughness

Tochigi

Nagaoka

Wilhjelm

et al. 2022

Jpn. J. Appl. Phys.

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In the early stage of atherosclerosis, the luminal surface of the arterial wall becomes rough. Methods for distinguishing between the reflected and backscattered components in the ultrasonic echo from the arterial wall has the potential to be used as a method for assessment of the roughness of the arterial wall. In this study, we proposed a method to distinguish between the reflected and backscattered components using a technique based on plane wave compounding. This method was evaluated by experiments using planar phantoms with rough surfaces made of polyurethane rubber. The coefficient of variation calculated from the mean value of the reflection component and the standard deviation of the backscattering component was proportional to the roughness of the rubber phantom. This result shows the potential usefulness of this method for analyzing surface roughness of the arterial wall.

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“…In our previous work, 26) a method for separation of the scattered and the reflected components in the echo signal was investigated by a linear scanning method using conventional focused beams as well as synthetic aperture imaging using far-focused transmit beams. In this preliminary investigation, the spatial resolution of the image emphasizing the backscattering component was compared to improve.…”

Section: Introductionmentioning

confidence: 99%

Study on estimation of surface roughness by separation of reflection and backscattering components using ultrasonic synthetic aperture imaging

Nagata

Nagaoka

Wilhjelm³

et al. 2021

Jpn. J. Appl. Phys.

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The luminal surface of the arterial wall roughens in the early-stage atherosclerosis. A possible differentiation between the reflected and scattered components in the ultrasonic echo from the arterial wall potentially can serve as a diagnostic tool when such roughening occurs. This study presents a method for the differentiation of reflection and scattering components by creating ultrasonic beams from different directions using the synthetic aperture method. The technique was evaluated in experiments on urethane rubber phantoms. The average magnitude of the echo signals from each phantom and the ratio of the mean values of the reflection and scattering components were found to be proportional to the arithmetic average roughness evaluated with a laser surface profilometer. These results show that the proposed separation technique has potentials in evaluation of surface roughness.

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Preliminary study on the separation of specular reflection and backscattering components using synthetic aperture beamforming

Cited by 9 publications

References 31 publications

On the physics of ultrasound transmission for in-plane needle tracking in guided interventions

On the physics of ultrasound transmission for in-plane needle tracking in guided interventions

Enhancement of reflection and backscattering components by plane wave imaging for estimation of surface roughness

Study on estimation of surface roughness by separation of reflection and backscattering components using ultrasonic synthetic aperture imaging

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