Super-resolution in time-reversal acoustics

Blomgren, Peter; Papanicolaou, George; Zhao, Hongkai

doi:10.1121/1.1421342

Cited by 325 publications

(356 citation statements)

References 20 publications

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“…7(b), the spatial resolution is about 1.74 mm. This high resolution benefits from the super resolution property of TRM technique [23]. The good spatial resolution of thermo-acoustic image also benefits from the large aperture size of the circular array.…”

Section: Experimental Results and Analysesmentioning

confidence: 99%

System Development of Microwave Induced Thermo-Acoustic Tomography and Experiments on Breast Tumor

Zhao¹,

Song²,

Zhu³

et al. 2013

PIER

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Abstract-Microwave induced thermo-acoustic tomography (MI-TAT) has become a keen research topic in recent years due to its great potential in early breast cancer detection. A secure and accurate MI-TAT system has been established. Some experiments have been made to demonstrate the performance of the MITAT system. Based on an experiment using phantom, some quantitative features of the system have been obtained. Some imaging experiments with real human breast cancer tissues are performed to demonstrate its effectiveness and the potential in clinical diagnosis. Images with both high contrast and fine spatial resolution are achieved by using time reversal mirror (TRM) technique in the imaging processing. Moreover, comparisons between the MITAT system result and an ultrasound imaging system result are made. From the comparison, the MITAT system shows its advantages of better contrast over the ultrasound imaging system. The system and the experiments in this paper verify the mechanism of MITAT for breast cancer detection and provide a prototype basis for clinical practice.

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Section: Experimental Results and Analysesmentioning

confidence: 99%

System Development of Microwave Induced Thermo-Acoustic Tomography and Experiments on Breast Tumor

Zhao¹,

Song²,

Zhu³

et al. 2013

PIER

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show abstract

“…In a homogeneous medium, the computational Green's function equals to the actual one, the cross range resolution (in directions parallel to the array) is λL/a and the range resolution is λ(L/a) 2 [30] (a is the physical aperture, L is the propagation distance, λ is the carrier wavelength of the probing pulses). In a heterogeneous, multipathing environment, TRM technique can achieve much better resolution [15,31]. This phenomenon is called super-resolution and comes from multipath caused by the media heterogeneities.…”

Section: Time Reversal Mirror (Trm) Techniquementioning

confidence: 99%

“…This phenomenon is called super-resolution and comes from multipath caused by the media heterogeneities. Theoretically analysis in [31] provided an effective aperture formula for a finite aperture or Gaussian TRM in random media…”

Section: Time Reversal Mirror (Trm) Techniquementioning

confidence: 99%

Evaluation of TRM in the Complex Through Wall Environment

Zheng¹,

Zhao

Nie³

et al. 2009

PIER

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Abstract-Practical interests arising from behind-the-wall target detection, surveillance and reconnaissance et al. claim for high capability of imaging in complicated environments. Time Reversal Mirror (TRM) technique, making use of the principle of reciprocity, emerges as a promising way to deal with such complex problem. In this paper, we investigate TRM in the ultra-wideband (UWB) through wall radar imaging (TWRI) through numerical simulation. The probing region is a square room, with walls of rough surface and random media parameters. TRM is used to image the target settled in the room. We evaluate the degradation of the images when the aperture of the array is decreased or the received signals are contaminated by noises. The back projection (BP) algorithm is employed here as a comparison for imaging quality. For the case in which the random walls are changed between the forward and inverse phase of time reversal, we check the imaging stability and applied an averaged Green's function to improve the imaging quality. Finally, some interesting conclusions are drawn.

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“…In a heterogeneous, multipath environment, TRM technique can achieve much better resolution [18,33]. This phenomenon is called super-resolution and comes from multipath caused by the media heterogeneities.…”

Section: Time Reversal Mirror (Trm) Techniquementioning

confidence: 99%

Application of TRM in the Uwb Through Wall Radar

Zheng¹,

Zhao²,

Nie³

2008

PIER

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Abstract-Time Reversal Mirror (TRM) technique, in the virtue of its high resolution in the heterogeneous media, has been widely applied in the area of acoustics and electromagnetics. In this paper, the technique is developed to imaging targets in the contest of ultra-wideband (UWB) through wall radar (TWR) through numerical simulation. We firstly consider the technique to image targets behind a single-layered wall and then extend to the multi-layered wall. The simulation results have reported the imaging capability of the algorithm and its powerful use for TWR imaging. For concerning the image stability, we investigate the TRM images for the case in which there is a mismatch between the walls associated with the forward and inverse phases of time reversal. The back projection imaging algorithm is compared here at the same time for a contrast of the imaging quality. Finally, some conclusions are drawn.

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Super-resolution in time-reversal acoustics

Cited by 325 publications

References 20 publications

System Development of Microwave Induced Thermo-Acoustic Tomography and Experiments on Breast Tumor

System Development of Microwave Induced Thermo-Acoustic Tomography and Experiments on Breast Tumor

Evaluation of TRM in the Complex Through Wall Environment

Application of TRM in the Uwb Through Wall Radar

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