Superficial Tissue Microsonography

Nowicki, Andrzej; Litniewski, Jerzy; Liwski, J.; Secomski, Wojciech; Karlowicz, P.; Lewandowski, Marcin

doi:10.1007/978-1-4419-8772-3_81

Cited by 3 publications

(4 citation statements)

References 3 publications

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“…An inversion estimate can then be produced, for instance, through a robust sampling-based (e.g., Markov chain Monte Carlo) method [1,41,53]. Such an inversion procedure can be interesting, for instance, in ultrasonic detection and classification of breast lesions [28][29][30][31][32]. Other potential inversion approaches to be used in the current context of signal sparsity include, for instance, the compressive sensing [54] and transdimensional Bayesian methods of geophysics [55][56][57].…”

Section: Discussionmentioning

confidence: 99%

“…Another project in progress aims to investigate the accuracy of the inversion with coarser materials, such as plaster or concrete, which can include a grained structure, cracks and casting defects hindering the signal and causing considerable model noise. Our general future goal is to provide complementary and more applied knowledge to serve asteroid tomography, ultrasound testing [26,[37][38][39], tomography of tree roots [36] as well as medical imaging [31,32].…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, the high permittivity of the asteroid minerals [17][18][19][20] is likely to lead to strongly randomized or noisy reflections 3 due to which the present inversion strategy utilizing the direct part of the signal can be advantageous [5]. In addition to asteroid tomography, other potential applications of the present sparse source inversion approach include on-site material testing and inspection [21][22][23][24][25][26][27], biomedical ultrasonography [28][29][30][31][32], as well as plenty of atmospheric, pedospheric, geological, and biological investigations utilizing travel time data [33][34][35], such as recovery of the root-zone structure of a tree [36].…”

Section: Introductionmentioning

confidence: 99%

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Sparse source travel-time tomography of a laboratory target: accuracy and robustness of anomaly detection

Pursiainen¹,

Kaasalainen²

2014

Inverse Problems

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Abstract. This study concerned conebeam travel-time tomography. The focus was on a sparse distribution of signal sources that can be necessary in a challenging in situ environment such as in asteroid tomography. The goal was to approximate the minimum number of source positions needed for robust detection of refractive anomalies, e.g., voids within an asteroid or a casting defects in concrete. Experimental ultrasonic data were recorded utilizing as a target a 150 mm plastic cast cube containing three stones with diameter between 22 and 41 mm. A signal frequency of 55 kHz (35 mm wavelength) was used. Source counts from one to six were tested for different placements. Based on our statistical inversion approach and analysis of the results, three or four sources were found to lead to reliable inversion. The source configurations investigated were also ranked according to their performance. Our results can be used, for example, in the planning of planetary missions as well as in material testing.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sparse source travel-time tomography of a laboratory target: accuracy and robustness of anomaly detection

Pursiainen¹,

Kaasalainen²

2014

Inverse Problems

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“…Therefore, when an internal organ has a different acoustic impedance from its surrounding tissue, the organ is observed as a high contrast. [14][15][16][17] Because the swimbladder is an organ with the highest reflectivity in a fish body, the swimbladder shape was clearly identified in bladdered fish, such as walleye pollock and goldeye rockfish. The organs with the second highest reflectivity are the skull and vertebra.…”

Section: Morphology Of Marine Animals Observed Using Underwater Acous...mentioning

confidence: 99%

Observation of Marine Animals Using Underwater Acoustic Camera

Iida

Takahashi

Tang

et al. 2006

jjap

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An underwater acoustic camera enclosed in a pressure-resistant case was constructed to observe underwater marine animals. This enabled the measurement of the size, shape, and behavior of living marine animals in the detection range up to 240 cm. The transducer array of the acoustic camera was driven by 3.5 MHz ultrasonic signals, and B-mode acoustic images were obtained. Observations were conducted for captive animals in a water tank and for natural animals in a field. The captive animals, including fish, squid and jellyfish, were observed, and a three-dimensional internal structure of animals was reconstructed using multiple acoustical images. The most important contributors of acoustic scattering were the swimbladder and vertebra of bladdered fish, and the liver and reproductive organs of invertebrate animals. In a field experiment, the shape, size, and swimming behavior of wild animals were observed. The possibilities and limitations of the underwater acoustic camera for fishery applications were discussed.

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