报告题目：HIRE : Harmonic Incompatibility Removal Modelfor Whole Brain Susceptibility Imaging
报告人：Jae Kyu Choi（崔宰珪）
Quantitative susceptibility mapping (QSM) uses the phase data in magnetic resonance signal to visualize a three dimensional susceptibility distribution by solving the magnetic field to susceptibility inverse problem. Due to the presence of zeros of the integration kernel in the frequency domain, QSM is an ill-posed inverse problem. Although numerous regularization based models have been proposed to overcome this problem, the incompatibility in the field data, which leads to deterioration of the recovery, has not received enough attention. In this talk, we show that the data acquisition process of QSM inherently generates a harmonic incompatibility in the measured local field. Based on such discovery, we propose two harmonic incompatibility removal (HIRE) susceptibility reconstruction models. The first generation HIRE (1GHIRE) adopts an additional sparsity based regularization term on the harmonic incompatibility. The second generation (2GHIRE) model adopts the idea of structured low rank approximation to better reflect the harmonic property of the incompatibility. Experimental results show that the proposed HIRE models achieve better performance than the existing single system regularization based approaches.
报告人简介：Jae Kyu Choi（崔宰珪）于2015年在延世大学获得应用数学博士学位，之后在上海交通大学做了三年的博士后研究。自2018年11月起，加入同济大学数学科学学院，担任助理教授。他的研究兴趣包括成像科学、医学成像、反问题、基于框架的方法、计算谐波分析以及微局部分析。崔教授先后在SIAM J. Imaging、J. Comp. Math、J. X-ray. Sci. Tech、SIAM Conference on Imaging Science等顶级期刊和会议中发表多篇论文。