Journal ArticleDOI
Statistics of Speckle in Ultrasound B-Scans
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TLDR
In this article, the authors derived autocorrelation functions and power spectra derived from B-scans of a scattering phantom containing many scatterers per resolution cell, leading naturally to the definition of the average speckle spot or cell sue, and this inturn is comparable to the resolution cell.Abstract:
the of the magnitude, i.e., intensity, of the field.) It is shown that Rayleigh statistics govern the fist-order behavior of the magnitude; and the autocorrelation of the resulting image speckle is obtained by the methodof Middleton. The corresponding power spectrum follows immediately by Fourier transformation. Theoretical and experimentally determined autocorrelation functions and power spectra derived from B-scans of a scattering phantom containing many scatterers per resolution cell are presented. These functions lead naturally to the definition of the average speckle spot or cell sue, and this inturn is comparable to the resolution cell. Each independent speckle servesas a degreeof freedom that determines the number of samples of tissue available over a target.As the speckle cell size decreases this number increases in a manner predictable from the physical parameters of the cell size. However, it is found that the speckle cellis broadened, the degrees of freedom diminished, when the object structureis correlated. This yields the possibilityof deducing information about the object structure from the second-order statistics of the speckle texture, in addition to that obtainable from the fiistorder statistics.read more
Citations
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Journal ArticleDOI
Ultrasound image segmentation: a survey
J.A. Noble,Djamal Boukerroui +1 more
TL;DR: This paper reviews ultrasound segmentation methods, in a broad sense, focusing on techniques developed for medical B-mode ultrasound images, and presents a classification of methodology in terms of use of prior information.
Journal ArticleDOI
Measurement of ventricular torsion by two-dimensional ultrasound speckle tracking imaging
Yuichi Notomi,Peter Lysyansky,Randolph M. Setser,Takahiro Shiota,Zoran B. Popović,Maureen G. Martin-Miklovic,Joan A. Weaver,Stephanie J. Oryszak,Neil L. Greenberg,Richard D. White,James D. Thomas +10 more
TL;DR: The STI estimation of LVtor is concordant with those analyzed by tagged MRI and also showed good agreement with those by DTI (data derived from tissue velocity) and may make the assessment more available in clinical and research cardiology.
Journal ArticleDOI
An adaptive weighted median filter for speckle suppression in medical ultrasonic images
TL;DR: In this article, the adaptive weighted median filter (AWMF) is proposed for reducing speckle noise in medical ultrasonic images. But it is not suitable for image segmentation.
Journal ArticleDOI
Controlled Attenuation Parameter (CAP): A Novel VCTE™ Guided Ultrasonic Attenuation Measurement for the Evaluation of Hepatic Steatosis: Preliminary Study and Validation in a Cohort of Patients with Chronic Liver Disease from Various Causes
Magali Sasso,Michel Beaugrand,Victor de Ledinghen,Catherine Douvin,Patrick Marcellin,Raoul Poupon,Laurent Sandrin,Véronique Miette +7 more
TL;DR: Results show that CAP can efficiently separate several steatosis grades and suggest that CAP is a noninvasive, immediate, objective and efficient method to detect and quantify Steatosis.
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A versatile wavelet domain noise filtration technique for medical imaging
TL;DR: A robust wavelet domain method for noise filtering in medical images that adapts itself to various types of image noise as well as to the preference of the medical expert; a single parameter can be used to balance the preservation of (expert-dependent) relevant details against the degree of noise reduction.
References
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Book
Probability, random variables and stochastic processes
TL;DR: This chapter discusses the concept of a Random Variable, the meaning of Probability, and the axioms of probability in terms of Markov Chains and Queueing Theory.
Journal ArticleDOI
Introduction to Fourier Optics
Joseph W. Goodman,Mary E. Cox +1 more
TL;DR: The second edition of this respected text considerably expands the original and reflects the tremendous advances made in the discipline since 1968 as discussed by the authors, with a special emphasis on applications to diffraction, imaging, optical data processing, and holography.
Book
Introduction to Fourier optics
TL;DR: The second edition of this respected text considerably expands the original and reflects the tremendous advances made in the discipline since 1968 as discussed by the authors, with a special emphasis on applications to diffraction, imaging, optical data processing, and holography.
Journal ArticleDOI
Mathematical analysis of random noise
TL;DR: In this paper, the authors used the representations of the noise currents given in Section 2.8 to derive some statistical properties of I(t) and its zeros and maxima.
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