Singular Spectrum Analysis Applied to Backscattered Ultrasound Signals from In Vitro Human Cancellous Bone Specimens

Measurement of tortuosity in aluminum foams using airborne ultrasound

“…Trabecular bone spacing is considered an important parameter to detect change in bone tissue microstructures. Some researchers have attempted to use ultrasonic techniques to estimate mean trabecular bone spacing, which is the average distance between regular trabeculae [1][2][3]. Interaction of ultrasound with cancellous bone is complicated because the received transmitted or reflected signals are influenced by many factors such as material absorptive characteristics, scattering mechanism, porosity, to name a few.…”

Analysis of microstructural alterations of normal and pathological breast tissue in vivo using the AR cepstrum

“…Since Fellingham [6] first proposed the use of this parameter in 1979, mean scatterer spacing has been used by various investigators for tissue characterization [7][8][9][10][11][12][13][14][15][16][17][18]22]. Spectral techniques for estimating the mean scatterer spacing can be classified as power spectral density methods (PSD) [7], cepstral methods [9][10][11], and spectral redundancy techniques [12][13][14][15][16]. Previous work utilized the PSD of the backscattered echo spectrum to characterize scatterer spacing of the tissue microstructure [7][8][9], but the PSD only includes the correlation between each spectral component and its own conjugate.…”

A programmable real-time system for development and test of new ultrasound investigation methods

“…Moreover, the availability of multiple demodulators can be exploited to simultaneously get the microbubble echoes at fundamental and harmonic frequencies [24]. Other possible fields of application include radiation force imaging [25], tissue characterization [26], and the measurement of material properties [27]. The system programmability and its limited dimensions make it ideal for possible implementation of a large class of new US methods that could be proposed by other laboratories.…”