Simulation of Forward Propagated Signals in Acoustic Time Reversal

Tommiska, Oskari; Moilanen, Petro; Mustonen, Joonas; Rauhala, Timo; Gritsevich, Maria; Salmi, Ari; Haggstrom, Edward

doi:10.1109/ultsym.2019.8926189

Cited by 4 publications

(1 citation statement)

References 8 publications

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“…There are several methods to solve the non-planar state array localization problem by collecting information on the relative positions of the array elements attached to the target surface by computed tomography (CT) [ 21 , 22 ] or by obtaining the time of flight between each array element and the target point [ 23 , 24 ]. The time reversal method is often selected to solve the array element coordinate offset, which is realized in three ways [ 25 , 26 ]. The first is that the micro acoustic reflector is placed at the target point to recapture the reflected sound wave by each array element in the initial array.…”

Section: Introductionmentioning

confidence: 99%

Laser Scanning Guided Localization Imaging with a Laser-Machined Two-Dimensional Flexible Ultrasonic Array

Chen

Liu

et al. 2022

Micromachines

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Advances in flexible integrated circuit technology and piezoelectric materials allow high-quality stretchable piezoelectric transducers to be built in a form that is easy to integrate with the body’s soft, curved, and time-dynamic surfaces. The resulting capabilities create new opportunities for studying disease states, monitoring health/wellness, building human–machine interfaces, and performing other operations. However, more widespread application scenarios are placing new demands on the high flexibility and small size of the array. This paper provides a 8 × 8 two-dimensional flexible ultrasonic array (2D-FUA) based on laser micromachining; a novel single-layer “island bridge” structure was used to design flexible array and piezoelectric array elements to improve the imaging capability on complex surfaces. The mechanical and acoustoelectric properties of the array are characterized, and a novel laser scanning and positioning method is introduced to solve the problem of array element displacement after deformation of the 2D-FUA. Finally, a multi-modal localization imaging experiment was carried out on the multi-target steel pin on the plane and curved surface based on the Verasonics system. The results show that the laser scanning method has the ability to assist the rapid imaging of flexible arrays on surfaces with complex shapes, and that 2D-FUA has wide application potential in medical-assisted localization imaging.

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