MRI and PET are important modalities and can provide complementary information for the diagnosis of brain diseases because MRI can provide structural information of brain and PET can obtain functional information of brain. However, PET is usually missing. Especially, simultaneous PET and MRI imaging at ultrahigh field is not achievable in the current. Thus, synthetic PET using MRI at ultrahigh field is essential. In this paper, we synthetic PET using MRI as a guide by joint probability distribution of diffusion model (JPDDM). Meanwhile, We utilized our model in Ultrahigh Fields.

翻译：核磁共振成像（MRI）和正电子发射断层扫描（PET）是重要成像模态，两者可为脑疾病诊断提供互补信息：MRI提供脑部结构信息，PET获取脑部功能信息。然而，PET数据通常缺失。特别是，目前无法实现超高场下的同步PET和MRI成像。因此，基于超高场MRI合成PET图像至关重要。本文采用扩散模型联合概率分布（JPDDM），以MRI为导向合成PET图像，同时将模型应用于超高场环境。