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Deep-learning-based motion-correction algorithm in optical resolution photoacoustic microscopy

Visual Computing for Industry,Biomedicine,and Art 2019年第1期2卷 103-108页

作者： Xingxing Chen Weizhi Qi Lei Xi School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 610054SichuanChina Department of Biomedical Engineering Southern University of Science and TechnologyShenzhen 518055GuangdongChina

In this study,we propose a deep-learning-based method to correct motion artifacts in optical resolution photoacoustic microscopy(OR-PAM).The method is a convolutional neural network that establishes an end-to-end map from input raw data with motion artifacts to output corrected images.First,we performed simulation studies to evaluate the feasibility and effectiveness of the proposed method.Second,we employed this method to process images of rat brain vessels with multiple motion artifacts to evaluate its performance for in vivo applications.The results demonstrate that this method works well for both large blood vessels and capillary networks.In comparison with traditional methods,the proposed method in this study can be easily modified to satisfy different scenarios of motion corrections in OR-PAM by revising the training sets.

关键词： Deep learning Optical resolution photoacoustic microscopy motion correction

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A motion correction on direct estimations of air-sea fluxes from a buoy

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Acta Oceanologica Sinica 2013年第3期32卷 63-70页

作者： HUANG Yansong SONG Jinbao FAN Conghui Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of Sciences South China Sea Marine Engineering Surveying Center State Oceanic Administration

A flux system deployed on a moored buoy has been described, which is capable of directly estimating the airsea fluxes after removing the contamination in the signal due to buoy motion. A triple loop fitting method has been demonstrated for determining the three angular offsets between measurement axes of the sonic anemometer and motion pack. The data collected in an experiment in the Northern Huanghai Sea is used to correct the three sonic anemometer measurements of turbulent wind for buoy motion. The effective removal of wave-scale motion from the spectra and cospectra are demonstrated. Estimates of along-wind momentum flux, sensible heat flux and latent heat flux calculated by the eddy correlation method based on data obtained by sonic anemometer 81000V are shown to be in the same trend and scale with those determined by the bulk aerodynamic method after motion correction. The motion correction not only greatly improve the estimation of the momentum flux but also has a great impact on the calculated sensible heat flux.

关键词： air-sea fluxes motion correction angular offset eddy correlation method bulk aerodynamicmethod

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Respiratory motion correction with an improved demons algorithm for PET images

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Chinese Physics C 2012年第10期36卷 1025-1030页

作者：高娟柴培贠明凯刘双全单保慈魏龙 Key Laboratory of Nuclear Analysis Techniques Institute of High Energy Physics Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences

Respiratory motion is a major factor that affects the quality of PET images of the thoracic area. The diaphragm moves about 15–20 mm due to respiratory motion, which substantially degrades the effective spatial resolution of PET. In this paper, a gated acquisition method is used to correct the motion effects. In this method, an improved demons algorithm is proposed to align the gated images. The experimental results show that the quality of PET images is significantly improved when using our improved method and the proposed method has a faster convergence rate than the original demons algorithm.

关键词： motion correction demons algorithm discontinuity PET

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Recent progress on imaging technology and performance testing of PET/MR

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Radiation Detection Technology and Methods 2023年第1期7卷 84-89页

作者： Jianing Liu Jianhua Geng Department of Nuclear Medicine National Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing100021China

Purpose Integrated positron emission tomography and magnetic resonance(PET/MR)is a multimodality imaging technology integrating PET and MR,which can reflect the anatomical structure and physiological function simultaneously.With the development of this technology,PET/MR plays an increasingly important role in clinical diagnosis and treatment.This review would demonstrate the current state of the latest advancement of PET/MR detection technology.Methods In this review,some studies of PET/MR detection technology in motion artifact correction,time of flight,noise reduction,performance testing methods,and phantoms were summarized.Results and conclusions PET/MR is advancing rapidly in imaging technology and has achieved phased achievements.The performance testing results of different models prove that the integration of PET and MR does not affect the respective performance,and the performance testing phantom for PET/MR needs further development.

关键词： Positron emission tomography Magnetic resonance imaging motion correction Time of flight Performance test

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Air-sea carbon-dioxide flux estimated by eddy covariance method from a buoy observation

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Acta Oceanologica Sinica 2012年第6期31卷 66-71页

作者： HUANG Yansong SONG Jinbao WANG Juanjuan FAN Conghui South China Sea Marine Engineering Surveying Center State Oceanic AdministrationGuangzhou 510300China Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China Graduate School of Chinese Academy of Sciences Beijing 100049China Graduate School of Chinese Academy of Sciences Beijing 100049China

Precise measurements of the CO2 gas transfer across the air-sea interface provide a better under- standing of the global carbon cycle. The air-sea CO2 fluxes are obtained by the eddy covariance method and the bulk method from a buoy observation in the northern Huanghai sea. The effects of buoy motion on flux calculated by the eddy covariance method are demonstrated. The research shows that a motion correction can improve the correlation coefficient between the C02 fluxes esti- mated from two different levels. Without the CO2-H20 cross-correlation correction which is termed as PKT correction, the air-sea CO2 fluxes estimated by eddy covariance method using the motion corrected data are nearly an order of magnitude larger than those estimated by the bulk method. After the CO2-H20 cross-correlation correction, some eddy covariance CO2 fluxes indeed become closer to the bulk CO2 flux, whereas some are overcorrected which are in response to small water vapor flux.

关键词： air-sea fluxes motion correction bulk carbon-dioxide flux method eddy covariancemethod

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