1. A method, comprising the steps of: selecting a first portion of list mode event data comprising a first quantity of annihilation events detected during a positron emission tomography scan, wherein the first quantity is greater than one, and the first quantity is determined prior to the selection of the first list mode even data portion; applying a list-based reconstruction technique generating first list mode event data portion thereby generating a first portion of tomographic data; generating an image indicative of the first portion tomographic data; displaying the image indicative of the first portion of tomographic data; applying a list-based reconstruction technique to at least one of the first list mode event data portion and the first portion of tomographic data, as well as to a second portion of the list mode event data comprising a second quantity of annihilation events detected during the positron emission tomography scan, wherein the second quantity is greater than one, thereby generating a composite tomographic data; generating an image indicative of the composite tomographic data; and displaying the image indicative of the composite tomographic data.