Envelope Statistics and Backscattered Power-Spectrum Analysis of Rat Livers with High-Frequency Annular Array

Mizoguchi, Takeru; Mamou, Jonathan; Ketterling, Jeff; Tamura, Kazuki; Yoshida, Kenji; Yamaouchi, T.

doi:10.1109/ultsym.2018.8579842

Cited by 2 publications

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“…In our previous study, the accuracy of the QUS parameter estimation assuming the spherical Gaussian model (SGM) case was low, 35) and the results of the fluid-filled sphere (FFSM) and the structure factor model (SFM) was almost same under the low scattering condition. 36) Thus, the QUS parameters were analyzed by the SFM in this study. By considering an ensemble of identical solid spheres independently and randomly distributed, the theoretical BSC using the FFSM model can be expressed as BSC FFSM ( k ) = ϕ / V s σ b ( k ) where ϕ is the scatterer concentration, and V s is the sphere volume.…”

Section: Methodsmentioning

confidence: 97%

Section: Backscatter Coefficient (Bsc) Analysismentioning

confidence: 97%

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Comprehensive backscattering characteristics analysis for quantitative ultrasound with an annular array: a basic study on homogeneous scattering phantom

Mizoguchi

Tamura

Mamou

et al. 2019

Jpn. J. Appl. Phys.

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High-frequency ultrasound (HFU, >20 MHz) and quantitative ultrasound (QUS) methods permit a means to understand the relationship between anatomical and acoustic characteristics. In our previous research, we showed that analyzing the acoustic scattering with HFU was an effective method for noninvasive diagnosis. However, the depth of field (DOF) of HFU transducers was limited, which constrains the range of QUS analysis. In this study, we seek to improve the accuracy of HFU, QUS-based parameters on the envelope statistics and frequency-based analysis by using an annular array that allows for an extended DOF. A 20-MHz annular-array transducer with five elements was employed to obtain signals which were beamformed in post-processing. Two kinds of low concentration scattering phantoms were scanned with 30-μm step size. Two QUS analysis techniques were employed: the Nakagami distribution and the reflector method. The results demonstrated that the annular array provides a stable analysis over an extended axial range.

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Section: Methodsmentioning

confidence: 97%

Section: Backscatter Coefficient (Bsc) Analysismentioning

confidence: 97%

Comprehensive backscattering characteristics analysis for quantitative ultrasound with an annular array: a basic study on homogeneous scattering phantom

Mizoguchi

Tamura

Mamou

et al. 2019

Jpn. J. Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…In our previous studies using homogeneously scattering phantoms, 34,35) a 20 MHz HFU annular array was used for amplitude envelope statistics and spectral-based analysis (reflector method). An improved DOF for QUS parameter estimation was found compared to that for the fixed focusing (FF) case.…”

Section: Introductionmentioning

confidence: 99%

Improved evaluation of backscatter characteristics of soft tissue using high-frequency annular array

Mizoguchi

Yoshida

Mamou

et al. 2020

Jpn. J. Appl. Phys.

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Clinical ultrasound is widely used for quantitative diagnosis. To clarify the relationship between anatomical and acoustic properties, high resolution imaging using high-frequency ultrasound (HFU) is required. However, when tissue properties are evaluated using HFU, the depth of field (DOF) is limited. To overcome this problem, an annular array transducer, which has a simple structure and produces high-quality images, is applied to HFU measurement. In previous phantom experiments, we demonstrated that the HFU annular array extends the DOF compared to that of a single-element transducer for quantitative ultrasound (QUS) analysis. Here, we extend that work by applying QUS methods to an ex vivo rat liver. The present study demonstrates that an annular array extends the region and improves the resolution for tissue characterization for an excised healthy rat liver. Amplitude envelope statistics and spectral-based analysis are used as QUS methods.

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Envelope Statistics and Backscattered Power-Spectrum Analysis of Rat Livers with High-Frequency Annular Array

Cited by 2 publications

References 0 publications

Comprehensive backscattering characteristics analysis for quantitative ultrasound with an annular array: a basic study on homogeneous scattering phantom

Comprehensive backscattering characteristics analysis for quantitative ultrasound with an annular array: a basic study on homogeneous scattering phantom

Improved evaluation of backscatter characteristics of soft tissue using high-frequency annular array

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