Capabilities of Layered Ultrasound Tomographyстатья
Статья опубликована в журнале из списка RSCI Web of Science
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Статья опубликована в журнале из перечня ВАК
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 9 декабря 2020 г.
Аннотация:This article discusses the capabilities of layered “2.5D” schemes in ultrasound tomography, in which the emitters and detectors are located in the same plane. The primary application of this method is medical imaging technology for early-stage breast cancer diagnosis. The inverse problem of tomographic image reconstruction is posed as a coefficient inverse problem for the wave equation, where the wave propagation velocity is an unknown function of two coordinates. In this formulation, the problem has much less computational complexity than in a 3D formulation, in which the wave velocity is reconstructed as a function of three coordinates. Nevertheless, the inverse problem in the layered “2.5D” formulation is non-linear and requires the use of supercomputers. A practically feasible parallel implementation of the image reconstruction algorithms on a GPU cluster is proposed. This study shows that the layered model is applicable if the imaged objects are close to cylindrical. Refraction of ultrasound waves in the vertical direction cannot be taken into account by the layered model. The more significant is the refraction, the more the reconstructed image differs from reality. The experiments were carried out using the test bench developed at the Scientific Research Computing Centre of Lomonosov Moscow State University.