报告时间：4月21日上午10：00-11：10
报告地点：教3-338会议室
报告题目：Four Dimensional Cone-Beam Computer-Tomography Image Reconstruction
摘要：Four Dimensional Cone-Beam Computer-Tomography (4DCBCT) can provide respiratory phase resolved volumetric images in image guided radiation therapy. However, the quality of the volumetric phase images is severely impaired by highly insufficient amount of projection data available for each phase. Therefore, making good use of limited projection data is crucial to eliminate streaking artifacts and improve image quality. In this work, we propose a novel common mask guided 4DCBCT image reconstruction method, which generates a common motion mask first, and then using it to guide phase image reconstruction. The common motion mask separates each phase image into a possible moving part and a common static part across all the phases. Then, the static part is reconstructed using full projection data alternatively with the possible moving part reconstructed using the projection data for respective phase through solving a minimization problem. As a result, image quality for reconstructed 4D CBCT images is greatly improved. The experimental results on synthetic and real images indicate that the proposed method is effective and reliable.
陈韵梅教授：美国佛罗里达大学终身教授，曾获中华人民共和国国家自然科学三等奖、中华人民共和国教育部科技进步一等奖。最近五年来，陈韵梅教授主要致力于数学和图像科学这一交叉学科的研究。研究课题不仅包括图像分析中数学模型的建立与数值方法的发展，而且对其潜在的数学理论进行了进一步的探索。她在国际最顶尖成像期刊发表多篇具有重要影响的学术论文。陈韵梅教授被公认为偏微分方程与图像处理领域内的世界级科学家，在国际上具有崇高的学术地位。
