In this project, the investigators aim to investigate the imaging approaches for breast cancer-related secondary lymphedema. The clinical study aims to optimize the conventional MRI methods for mapping lymphedema and assess the post-surgical therapeutic effects in longitudinal follow-up studies. Additionally, a normal imaging database of lymphedema MRI images will be established for future reference. For pre-clinical animal study, investigators aim to develop and integrate two novel MRI methods, including free water elimination diffusion MRI and diffusion kurtosis MRI techniques. By integrating clinical and pre-clinical studies, the investigators aim to establish a precise imaging tool for evaluating the therapeutic effects of lymphedema for following translational applications.