Dr. Qingguang Chen Profile

Dr. Qingguang Chen

at Hangzhou Dianzi Univ

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Publications (7)

Proceedings Article | 15 February 2021 Presentation + Paper

Toward development of automated grading system for carious lesions classification using deep learning and OCT imaging

Hassan Salehi, Majd Barchini, Qingguang Chen, Mina Mahdian

Proceedings Volume 11600, 1160014 (2021) https://doi.org/10.1117/12.2581318

KEYWORDS: Imaging systems, Optical coherence tomography, Dental caries, Classification systems, Teeth, Diagnostics, Systems modeling, Image resolution, Receivers, Performance modeling

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Proceedings Article | 19 February 2020 Paper

Classification of pit and fissure for caries risk based on 3D surface morphology analysis of tooth

Qingguang Chen, Xing Jin, Haihua Zhu, Hassan Salehi

Proceedings Volume 11217, 112170E (2020) https://doi.org/10.1117/12.2544611

KEYWORDS: Teeth, Luminescence, Dental caries, 3D modeling, 3D image processing, Clouds, Cameras, Data modeling, 3D scanning, Image registration

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Tooth surface with pits and fissures is the most prevalent of carious area for suitability of plaque accumulation. Pit and fissure sealing has been proven be effective in preventing and arresting pit-and-fissure occlusal caries lesions of primary and permanent molars in children and adolescents and can greatly affect smooth surface carious lesion reduction. Clinical decision to seal enamel pits and fissures needs to assess caries risk of the tooth. Surface morphology of pit and fissure, judged by dentist’s subjective experience, together with other factors of socioeconomic status of family, dietary habit, caries history, etc, are comprehensively considered. Due to morphological complexity and diversity of tooth surface, the decision lacks objective morphology-based caries-risk assessment of pit and fissure. In the paper, dental plaque-guided evaluation of pit and fissure caries risk based on 3D morphology analysis of occlusal surface is investigated. The 3D point cloud data of tooth surface are obtained from a commercial 3D intra-oral scanner. Pit-andfissure region can be extracted using region growing. Then skeleton of pit and fissure is determined by L1-medial skeleton method. Section profile of pit-and-fissure can then be obtained for morphological analysis. Bearing area curve (BAC) is introduced to evaluate the morphological distribution and five BAC-based parameters are defined as quantitative indices to describe the characteristic of pit-and-fissure morphology. Dental plaque was quantitatively evaluated by image component ratio of fluorescence image. To obtain dental plaque distribution of 3D pit and fissure region, ICP-based contour registration method was proposed to map fluorescence image on 3D occlusal surface. Nonlinear modeling of plaque distribution and morphological feature was explored using RBF neural network. The reported work reveals that 3D morphological parameters can be used as effective predictors for pit and fissure caries risk evaluation.

Proceedings Article | 5 March 2018 Paper

Optimization design of LED heat dissipation structure based on strip fins

Lingyun Xue, Wenbin Wan, Qingguang Chen, Huanle Rao, Ping Xu

Proceedings Volume 10710, 107102H (2018) https://doi.org/10.1117/12.2317711

KEYWORDS: Light emitting diodes, Neural networks, Convection, Particle swarm optimization, Optimization (mathematics), Evolutionary algorithms, Thermal effects, Mathematical modeling, Solar radiation models, Temperature metrology

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Proceedings Article | 5 March 2018 Paper

Tactile sensor of hardness recognition based on magnetic anomaly detection

Lingyun Xue, Dongfang Zhang, Qingguang Chen, Huanle Rao, Ping Xu

Proceedings Volume 10710, 107102J (2018) https://doi.org/10.1117/12.2317715

KEYWORDS: Magnetism, Magnetic sensors, Sensors, Ferromagnetics, Resistance, Chemical elements, Signal detection, Structural design, Intelligent sensors, Iron

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Proceedings Article | 5 March 2018 Paper

Spatial layout optimization design of multi-type LEDs lighting source based on photoelectrothermal coupling theory

Lingyun Xue, Guang Li, Qingguang Chen, Huanle Rao, Ping Xu

Proceedings Volume 10710, 107102I (2018) https://doi.org/10.1117/12.2317713

KEYWORDS: Light emitting diodes, Thermal effects, Resistance, Thermal modeling, Light sources, Genetic algorithms, Optimization (mathematics), LED lighting, Temperature metrology, Positron emission tomography

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Proceedings Article | 12 January 2018 Paper

Mueller matrix imaging study to detect the dental demineralization

Qingguang Chen, Huanbo Shen, Binqiang Wang

Proceedings Volume 10620, 1062019 (2018) https://doi.org/10.1117/12.2293574

KEYWORDS: Tissues, Teeth, Linear polarizers, Tissue optics, Backscatter, Biomedical optics, Dental caries, Colorectal cancer, Polarization, Colon

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Proceedings Article | 19 December 2013 Paper

Signal process research in quartz crystal chip counting system

Zhebo Chen, Qingguang Chen, Yajing Ji

Proceedings Volume 9045, 90451P (2013) https://doi.org/10.1117/12.2038085

KEYWORDS: Crystals, Signal processing, Image processing, Quartz, Imaging systems, Interference (communication), Machine vision, Cameras, Oscillators, Optical components

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Showing 5 of 7 publications

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