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RISS 인기검색어
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- 저자 : Liwei Deng (검색결과 2 건)
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Improving performance of medical image alignment through super-resolution
Liwei Deng,Yuanzhi Zhang,Jing Wang,Sijuan Huang,Xin Yang 대한의용생체공학회 2023 Biomedical Engineering Letters (BMEL) Vol.13 No.3
Medical image alignment is an important tool for tracking patient conditions, but the quality of alignment is influenced bythe effectiveness of low-dose Cone-beam CT (CBCT) imaging and patient characteristics. To address these two issues, wepropose an unsupervised alignment method that incorporates a preprocessing super-resolution process. We constructed themodel based on a private clinical dataset and validated the enhancement of the super-resolution on alignment using clinicaland public data. Through all three experiments, we demonstrate that higher resolution data yields better results in the alignmentprocess. To fully constrain similarity and structure, a new loss function is proposed; Pearson correlation coefficientcombined with regional mutual information. In all test samples, the newly proposed loss function obtains higher resultsthan the common loss function and improve alignment accuracy. Subsequent experiments verified that, combined with thenewly proposed loss function, the super-resolution processed data boosts alignment, can reaching up to 9.58%. Moreover,this boost is not limited to a single model, but is effective in different alignment models. These experiments demonstratethat the unsupervised alignment method with super-resolution preprocessing proposed in this study effectively improvedalignment and plays an important role in tracking different patient conditions over time.
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Improved design method for line gear pair based on screw theory
Jiang Ding,Liwei Liu,Yuting Wei,Aiping Deng 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.4
The line gear (LG) is a novel gear mechanism based on conjugate space curve meshing theory. It is suitable for micro-mechanical systems due to its small size, light weight, and large transmission ratio. Since its invention, the LG pair has been studied from the perspective of differential geometry. To simplify the design process of the LG pair, we studied the LG pair from the innovative perspective of screw algebra. A unified screw coordinate was created for the LG pair, and velocity screws were established to derive its meshing equations. Moreover, the design equations of the center curves and contact curves were calculated for the driving line teeth and the driven line teeth, respectively. Finally, examples of LG pairs were fabricated for the kinematic performance tests, which indicated that the LG pairs designed according to screw theory were capable of performing a stable transmission.
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