不同的断层成象技术,如X线CT、MRI、PET等都各有特点,各带有不同的生理的、病理的、功能的或解剖学的信息。有不少场合,希望能同时看到不同类型断层象的信息。这时就需要把几种不同来源的三维图象进行配准,例如要在一个三维图象中(包括各种切割面)既要看到表皮、骨头,又要看到各种软组织(图12)。有时对不同时间、同一来源的图象要加以比较,也有配准问题,例如对一个肿瘤在不同时间的容积和形态进行定量的比较。把图象容积与一目标模型套准就可以 Different tomography techniques, such as X-ray CT, MRI, PET, etc. have their own characteristics, each with different physiological, pathological, functional or anatomical information. There are many occasions, hoping to see the different types of tomographic image information. In this case, three-dimensional images from several different sources need to be registered. For example, in a three-dimensional image (including various cutting surfaces), both the epidermis and the bones are to be seen, and various soft tissues are also seen ). Sometimes images of the same origin are compared at different times and also have registration problems such as a quantitative comparison of the volume and morphology of a tumor at different times. Register the image volume with a target model