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Zhenhua Wei,Limao Ren,Shibo Song 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.3
3-D reconstruction of industrial flame could be used to research for the completeness of combustion and flame temperature field. As the flame flicks and has no regular evident characteristic, 3-D reconstruction of flame is difficult and lack of study. The paper proposed a stereo matching algorithm for flame based on distance ratio constraint (DRCFMA). Taking flame characteristics into account and using the processed SIFT operates to get the ratio constraint of matched feature points, the algorithm is applied on the follow-up 3-D reconstruction of flame. The results shows the validity and feasibility of DRCFMA. Compared with conventional algorithms, the proposed algorithm has a better accuracy and shorter time-taken for industrial flame. The experiments had shown that the follow-up 3-D reconstruction of flame has clear and continuously changing greyscale layers.
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Guozheng Jiang,Luchun Xu,Yukun Ma,Jianbin Guan,Yongdong Yang,Wenqing Zhong,Wenhao Li,Shibo Zhou,JiaWei Song,Ningning Feng,Ziye Qiu,Zeyu Li,YiShu Zhou,Letian Meng,Yi Qu,Xing Yu 대한척추신경외과학회 2024 Neurospine Vol.21 No.2
Objective: To investigate the correlation between magnetic resonance imaging-based vertebral bone quality (VBQ) score and screw loosening after dynamic pedicle screw fixation with polyetheretherketone (PEEK) rods, and evaluate its predictive value. Methods: A retrospective analysis was conducted on the patients who underwent dynamic pedicle screw fixation with PEEK rods from March 2017 to June 2022. Data on age, sex, body mass index, hypertension, diabetes, hyperlipidemia history, long-term smoking, alcohol consumption, VBQ score, L1–4 average Hounsfield unit (HU) value, surgical fixation length, and the lowest instrumented vertebra were collected. Logistic regression analysis was employed to assess the relationship between VBQ score and pedicle screw loosening (PSL). Results: A total of 24 patients experienced PSL after surgery (20.5%). PSL group and nonPSL group showed statistical differences in age, number of fixed segments, fixation to the sacrum, L1–4 average HU value, and VBQ score (p < 0.05). The VBQ score in the PSL group was higher than that in the non-PSL group (3.56 ± 0.45 vs. 2.77 ± 0.31, p < 0.001). In logistic regression analysis, VBQ score (odds ratio, 3.425; 95% confidence interval, 1.552–8.279) were identified as independent risk factors for screw loosening. The area under the receiver operating characteristic curve for VBQ score predicting PSL was 0.819 (p < 0.05), with the optimal threshold of 3.15 (sensitivity, 83.1%; specificity, 80.5%). Conclusion: The VBQ score can independently predict postoperative screw loosening in patients undergoing lumbar dynamic pedicle screw fixation with PEEK rods, and its predictive value is comparable to HU value.
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