摘要PET-CT的出现和逐渐普及使大家认识到了其对恶性肿瘤的诊断、分期、疗效评价和判断预后等方面的优势，由于MRI的无辐射性及其在软组织分辨率方面的优势，在PET-MRi机型逐渐成熟后将再引发PET-MRI的装机热潮。该文主要就图像融合技术的发展历程以及目前部分学者在PET-MRI临床应用方面的研究做些归纳，以帮助人们了解此新仪器的功用，认识其广泛的应用前景。而在PET-MRI普及之前，仍可依据现有设备进行相关图像融合及临床应用研究。

abstractsThe emerging and growing in popularity of PET-CT scanner brings us the convenience and cognizes the advantages such as diagnosis, staging, curative effect evaluation and prognosis for malignant tumor.And the PET-MRI installing maybe a new upsurge when the machine gradually mature, because of the MRI examination without the radiation exposure and with the higher soft tissue resolution.This paper summarized the developing course of image fusion technology and some researches of clinical application about PET-MRI at present, in order to help people to understand the functions and know its wide application of the upcoming new instrument, mainly focuses the applications on the central nervous system and some soft tissue lesions.And before PET-MRI popularization, people can still carry out some researches of various image fusion and clinical application on the current equipment.