1. An imaging system (36) comprising: a positron emission tomography (PET) scanner (38) generating event data including true coincidence events and scattering events, wherein the event data includes each endpoint of the response line (LOR ), as well as energy at each endpoint； iodine or more processors (52) configured to: generate (72) a plurality of pairs of activity cards and attenuation cards based on true match events； and selecting (76) an activity map and an attenuation map from a plurality of pairs of activity and attenuation maps based on scattered events. 2. The visualization system (36) according to claim 1, wherein one or more processors (52) are further configured to: simulate (74) the distribution of at least scattered events based on each of the pairs of activity and attenuation cards； and selecting (76) a pair of activity and attenuation maps based on a comparison between the simulated distribution of scattered events and the recorded distribution of scattered events constructed from recorded scattered events. 3. The visualization system (36) according to any one of paragraphs. 1 and 2, in which one or more processors (52) are additionally configured to: decompose the distribution of scattered events into attenuation components based on the position of the end points. 4. The visualization system (36) according to any one of paragraphs. 1 and 2, in which one or more processors (52) are further configured to: reconstruct (78) an image based on at least one of: true match events and a selected attenuation map； or selected activity map. 5. The visualization system (36) according to any one of paragraphs. 1 and 2, in which many pairs of activity maps and attenuation maps1. Система (36) визуализации, содержащая:сканер (38) позитронно-эмиссионной томографии (PET), формирующий данные событий, включающие в себя события истинного совпадения и события рассеяния, при этом данные событий включают в себя каждую конечную точку линии ответа (LOR), а также энергию в к
