Ms. Tingting Wang Profile

Tingting Wang

at Tianjin Univ

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Author

Publications (3)

Proceedings Article | 1 March 2011 Paper

Multichannel photon counting DOT system based on digital lock-in detection technique

Tingting Wang, Huijuan Zhao, Zhichao Wang, Shaohua Hou, Feng Gao

Proceedings Volume 7896, 789612 (2011) https://doi.org/10.1117/12.871779

KEYWORDS: Light, Modulation, Photon counting, Signal detection, Field programmable gate arrays, Digital electronics, Signal to noise ratio, Time division multiplexing, Optical testing, Analog electronics

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Relying on deeper penetration of light in the tissue, Diffuse Optical Tomography (DOT) achieves organ-level tomography diagnosis, which can provide information on anatomical and physiological features. DOT has been widely used in imaging of breast, neonatal cerebral oxygen status and blood oxygen kinetics observed by its non-invasive, security and other advantages. Continuous wave DOT image reconstruction algorithms need the measurement of the surface distribution of the output photon flow inspired by more than one driving source, which means that source coding is necessary. The most currently used source coding in DOT is time-division multiplexing (TDM) technology, which utilizes the optical switch to switch light into optical fiber of different locations. However, in case of large amounts of the source locations or using the multi-wavelength, the measurement time with TDM and the measurement interval between different locations within the same measurement period will therefore become too long to capture the dynamic changes in real-time. In this paper, a frequency division multiplexing source coding technology is developed, which uses light sources modulated by sine waves with different frequencies incident to the imaging chamber simultaneously. Signal corresponding to an individual source is obtained from the mixed output light using digital phase-locked detection technology at the detection end. A digital lock-in detection circuit for photon counting measurement system is implemented on a FPGA development platform. A dual-channel DOT photon counting experimental system is preliminary established, including the two continuous lasers, photon counting detectors, digital lock-in detection control circuit, and codes to control the hardware and display the results. A series of experimental measurements are taken to validate the feasibility of the system. This method developed in this paper greatly accelerates the DOT system measurement, and can also obtain the multiple measurements in different source-detector locations.

Proceedings Article | 22 February 2011 Paper

Calibration methods of near-infrared frequency domain diffused light measurement system

Ying Fan, Huijuan Zhao, Xiaoqing Zhou, Julan Liang, Tingting Wang, Feng Gao

Proceedings Volume 7891, 78910Y (2011) https://doi.org/10.1117/12.871772

KEYWORDS: Calibration, Tissue optics, Modulation, Monte Carlo methods, Signal attenuation, Optical fibers, Optical properties, Near infrared spectroscopy, Phase shift keying, Phase measurement

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Proceedings Article | 25 February 2010 Paper

Improvement based on FDK reconstruction algorithm of conebeam CT

Hui Miao, Tingting Wang, Huijuan Zhao, Feng Gao

Proceedings Volume 7570, 757019 (2010) https://doi.org/10.1117/12.843625

KEYWORDS: Reconstruction algorithms, Image restoration, Computed tomography, Computer simulations, Algorithm development, Optical spheres, Numerical simulations, 3D image reconstruction, Detection and tracking algorithms, Sensors

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