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Adaptive hierarchical block tracking method in case of partial occlusions

Journal of Beijing Institute of Technology 2011年第2期20卷 233-237页

作者：罗涛王建中陆培源 State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology

In order to solve the tracking problem occurred during occlusions, an adaptive hierarchical block tracking method is proposed after analyzing the changes of the target characteristics under partial occlusions. Firstly, color histogram features are selected to describe the target. The similarity between the target model and the candidates is measured by the Bhattacharyya coefficient, which can also be used to evaluate the degree of occlusions. The object is divided into four blocks when it is occluded, and the mean shift procedure is used to track each block separately. Then, according to the value of the Bhattacharyya coefficient, the partially occluded block is found and divided into four sub-blocks, which are tracked by block matching algorithm separately. Finally, the information of all the blocks is used to determine the displacement vector of the target. Experimental results show that compared to the traditional mean shift tracking method, this method can make full use of the features of the unoccluded sub-blocks, improve the tracking accuracy and solve the target tracking problem in case of partial occlusions.

关键词： mean shift occlusions hierarchical blocks object tracking

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Bilateral Blunt Internal Carotid Artery occlusions Associated with Multiple Trauma: A Case Report

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Open Journal of Modern Neurosurgery 2017年第3期7卷 49-54页

作者： Ayumu Yamaoka Kei Miyata Naofumi Bunya Eichi Narimatsu Department of Emergency Medicine Sapporo Medical University Sapporo Japan

In multiple trauma, blunt carotid artery injuries (BCAIs) have occasionally been reported. However, bilateral blunt carotid artery occlusions (Grade 4 BCAIs) associated with multiple trauma are rare, and delays in diagnosis and treatment result in a lethal outcome. Here, we report our experience with bilateral carotid artery occlusions. A 76-year-old female suffered multiple traumas in a motor vehicle accident. On arrival at our hospital, she presented in a coma, with left mydriasis and unreactive pupils. Computed tomography (CT) showed bifrontal intracranial epidural hematoma and fractures of the facial bone and anterior skull base, and osteoplastic craniotomy was urgently undertaken for the epidural hematoma. However, the comatose state and unreactive pupils persisted during the post-operative course. Serial head CT findings showed progressive bilateral ischemic changes, and radiological examinations revealed bilateral internal carotid artery occlusions. We speculated that bilateral Grade 4 BCAIs had induced progressive cerebral infarctions. The patient partially responded to anticoagulation therapy with heparin infusion, but died of multiple organ failure on day 15. When bilateral progressive ischemic changes are observed in a patient with severe traumatic brain injury, bilateral Grade 4 BCAIs should be considered in the differential diagnosis. CT angiography as part of whole-body CT at admission may be effective for preventing delays in diagnosis and treatment of bilateral Grade 4 BCAIs.

关键词： Bilateral Blunt Carotid Artery occlusions Progressive Bilateral Cerebral Infarctions Whole-Body Computed Tomography

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Evaluation of Left Ventricular Function after Percutaneous Recanalization of Chronic Coronary occlusions: The Role of Two-Dimensional Speckle Tracking Echocardiography

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World Journal of Cardiovascular Diseases 2019年第12期9卷 899-914页

作者： Ahmed Emara Shady Zahran Neveen I. Samy Faculty of Medicine Menoufia University Menoufia Egypt Elagouza Charity Hospital Giza Egypt

Background: The recanalization of a chronic total coronary occlusion is the possible way to improve left ventricular (LV) function through the recovery of hibernating myocardium. Aim: The aim of this study is to evaluate the role of 2D speckle tracking in evaluation of the left ventricular (LV) systolic function in chronic total occlusion (CTO) patients before and at 1 day as well as 3 months after percutaneous coronary intervention (PCI). Patients and Methods: A prospective observational study included 40 patients diagnosed with coronary angiography to have a chronic total occlusion. Percutaneous coronary revascularization was performed according to standard practices with the femoral approach. Conventional 2D echocardiography was used to assess LV functions and wall motion abnormalities scoring index (WMAI). Using speckle-tracking echocardiography was to measure global longitudinal strain (GLS) and. Follow-up of patients was done at day 1 and 3 months later after PCI. Results: Forty patients were included in this study, with a mean age of 58.55 ± 7.98 years. GLS and WMAI difference at baseline and follow-up shows a positive correlation with left ventricular ejection fraction (LVEF) changes at baseline and follow-up (p Conclusion: The results of this study provide evidence to support the clinical use of 2D-STE to monitor the early changes of LV function. In patients undergoing CTO revascularization, change in GLS was more sensitive predictors for LV function improvement at 3-month follow-up.

关键词： Chronic Total occlusions Left Ventricular Function Percutaneous Coronary Intervention Ejection Fraction Speckle Tracking Echocardiography

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Object Tracking Algorithm Based on Camshift and Grey Prediction Model in occlusions

Object Tracking Algorithm Based on Camshift and Grey Predict...

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2012年计算机应用与系统建模国际会议

作者： Zhiwei Wang Fuping Yang College of Computer Science and Information Guizhou University College of Computer Science and Technology Chongqing University of Posts and Telecommunications

In this paper, an improved object tracking algorithm based on Camshift and grey prediction model GM (1.1) was proposed to solve problem of the poor tracking ability in occlusions. The whole tracking system could be divided into three parts: the occlusions identifying system based on Bhattacharyya coefficient analysis, the prediction system based on grey model GM (1.1) and Camshift algorithm. In the tracking process, those three parts run by turns according to different cases. Experiment results of variant video sequences demonstrate that the proposed method can track the objects stably and accurately during occlusions.

关键词： occlusions Grey prediction Camshift Object tracking

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A new buddy stingray and stick technique for antegrade dissection and re-entry during chronic total occlusion recanalization: a case report

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Journal of Geriatric Cardiology 2019年第11期16卷 835-839页

作者： Bing TIAN Quan-Min JING Bin WANG Yan-Bin SU Central Hospital affiliated to Shengyang Medical College ShenyangChina General Hospital of Northern Theater Command ShenyangChina

Although the retrograde approach was a promising strategy for chronic total occlusions(CTO)-percutaneous coronary interventions(PCI),[1]with the development of coronary interventional therapy technology and interventional instruments,antegrade dissection and re-entry(ADR)are commonly employed in PCI to open CTO of coronary arteries.

关键词： Antegrade dissection Chronic total occlusions Percutaneous coronary interventions

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