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34 results on '"Wu, Daixuan"'

4. Camera-based ultrasound-modulated optical tomography with isometric resolution.

Author

Lin, Guangzhong, Wu, Daixuan, Zhao, Jiayu, Xu, Yiyun, Shen, Yuecheng, and Shao, Lijie

Subjects
*OPTICAL tomography, *LIGHT absorption, *IMAGING systems, *OPTICAL images, *PROOF of concept, *HOLOGRAPHIC interferometry
Abstract

Ultrasound-modulated optical tomography (UOT) leverages the strengths of light and sound, enabling deep-tissue imaging with optical absorption contrast and acoustic resolution. Camera-based UOT, with its parallel detection capability, excels at handling weak light–sound interactions. However, the limited frame rate of the camera typically results in poor axial resolution and poses challenges for holographic measurements. In this study, we introduced intersected ultrasonic modulation to address these limitations, thereby achieving equal resolution in both lateral and axial dimensions through referenceless measurements. As a proof of concept, we constructed an imaging system and demonstrated two-dimensional imaging for absorptive targets buried inside a scattering medium. This approach opens avenues for improved imaging resolutions, showcasing the potential for future diagnostic endeavors. [ABSTRACT FROM AUTHOR]

Published
2024
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15. Probabilistic Phase Shaping Guided Wavefront Control of Complex Media with Information‐Limited Intensity Measurements.

Author

Wu, Daixuan, Wang, Zhengyang, Wang, Jian, Zou, Dongdong, Huang, Guoqiang, Luo, Jiawei, Lu, Liang, Shen, Yuecheng, and Li, Zhaohui

Subjects
*WAVEFRONTS (Optics), *ENGLISH letters, *ECOLOGICAL disturbances, *OPTICAL communications, *INFORMATION theory, *OPTICAL images
Abstract

Recent developments in wavefront shaping for complex media bring new possibilities to a variety of applications, including optical imaging, optical manipulation, and optical communications. In these applications, retrieving transmission matrices is critically important to the synthesization of arbitrary optical fields inside or through complex media. According to the information theory, 2N measurements contain sufficient information to determine N elements of the transmission matrix that include both amplitude and phase, suggesting a sampling ratio of γ=2$\gamma = 2$. While holographic approaches are sensitive to environmental disturbance, nonholographic phase‐retrieval methods take more intensity measurements to fight against nonlinearity. Untill today, a non‐holographic phase‐retrieval method that can effectively retrieve the transmission matrix with information‐limited intensity measurements, i.e., γ=2$\gamma = 2$, was still absent. In this work, this blank is filled by developing a probing strategy, termed probabilistic phase shaping (PPS) guided amplitude flow (AF). Retrieval of the transmission matrix of a multimode fiber (MMF) is experimentally demonstrated using the PPS‐AF method over (γ=3.5$\gamma = 3.5$) and with (γ=2$\gamma = 2$) information limit. Using the retrieved transmission matrix, wavefront control including projecting single optical foci and synthesizing English letters is demonstrated successfully. This work is an important step toward efficient wavefront control of complex media, showing great prospects for a wide range of applications. [ABSTRACT FROM AUTHOR]

Published
2023
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26. Imaging biological tissue with high-throughput single-pixel compressive holography

Author

Wu Daixuan, Luo Jiawei, Huang Guoqiang, Yuanhua Feng, Feng Xiaohua, Shen Yuecheng, and Zhao-Hui Li

Subjects
ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, ComputingMethodologies_COMPUTERGRAPHICS
Abstract

Single-pixel holography (SPH) is capable of generating holographic images with rich spatial information by employing only a single-pixel detector. Thanks to the relatively low dark-noise production, high sensitivity, large bandwidth, and cheap price of single-pixel detectors in comparison to pixel-array detectors, SPH is becoming an attractive imaging modality at wavelengths where pixel-array detectors are not available or prohibitively expensive. Moreover, SPH is particularly advantageous when imaging through scattering media or in scarce illumination with compressive sensing. In the current practice of SPH, the throughput of the system is mainly limited by the phase-encoded illumination and the ways to realize phase stepping. In this work, we developed a high-through single-pixel compressive holography, achieving a space-bandwidth-time product (SBP-T) of 41,667 pixels/s. This result indicates that by using a single-pixel detector, information of holographic images containing up to 65,536 pixels can be collected within only 3 seconds. The high-throughput was realized by enabling phase stepping naturally in time and abandoning the need for phase-encoded illumination. We further show that compressive sensing can be conveniently adapted to significantly reduce the acquisition time. Besides being high throughput, we also show that this holographic system is scalable to provide either a large field of view (~83 mm2) or a high resolution (5.8 μm × 4.3 μm). In particular, high-resolution holographic images of a piece of rat tail were presented, exhibiting rich information of mussel, cortical bone, and cancellous bone. Given that microscopic images of biological tissue has rarely been explored in the current practice of SPH, we anticipate the developed high-throughput SPH is promising to nourish the development of multi-spectrum imaging by providing high-quality holographic images for biological tissues.

Published
2021

33. Single-shot ultrasound-modulated optical tomography with enhanced speckle contrast

Author

Yuan, Dean, Luo, Jiawei, Wu, Daixuan, Zhang, Runsen, Lai, Puxiang, Li, Zhaohui, and Shen, Yuecheng

Abstract

Ultrasound-modulated optical tomography (UOT) images optical contrast deep inside biological tissue. Among existing approaches, camera-based parallel detection is beneficial in modulation depth but is limited to the relatively slow framerate of cameras. This condition prevents such a scheme from achieving maturity to image live animals with sub-millisecond speckle correlation time. In this work, we developed on-axis single-shot UOT by investigating the statistics of speckles, breaking the restriction imposed by the slow camera framerate. As a proof of concept, we experimentally imaged a one-dimensional absorptive object buried inside a moving scattering medium with speckle correlation time down to 0.48 ms. We envision that this single-shot UOT is promising to cope with live animals with fast speckle decorrelation.

Published
2021

34. Neural network enabled fringe projection through scattering media.

Author

Yang S, Shen Y, Luo J, Wang Z, Wu D, Liang J, Zhang Z, Qi D, Yao Y, Deng L, Zhang B, Sun Z, and Zhang S

Abstract

The projection of fringes plays an essential role in many applications, such as fringe projection profilometry and structured illumination microscopy. However, these capabilities are significantly constrained in environments affected by optical scattering. Although recent developments in wavefront shaping have effectively generated high-fidelity focal points and relatively simple structured images amidst scattering, the ability to project fringes that cover half of the projection area has not yet been achieved. To address this limitation, this study presents a fringe projector enabled by a neural network, capable of projecting fringes with variable periodicities and orientation angles through scattering media. We tested this projector on two types of scattering media: ground glass diffusers and multimode fibers. For these scattering media, the average Pearson's correlation coefficients between the projected fringes and their designed configurations are 86.9% and 79.7%, respectively. These results demonstrate the effectiveness of the proposed neural network enabled fringe projector. This advancement is expected to broaden the scope of fringe-based imaging techniques, making it feasible to employ them in conditions previously hindered by scattering effects.

Published
2024
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