  The complexity of the hardware and the amount of data collected during the
PET imaging process require application of modern methods of efficient data
organization and processing. In this article we will discuss the data
structures and the flow of collected data from the novel TOF-PET medical
scanner which is being developed at the Jagiellonian University. The developed
data format reflects: registration process of the gamma quanta emitted from
positron-electron annihilation, Front-End Electronic (FEE) structure and
required input information for the image reconstruction. In addition, the
system database fulfills possible demands of the evolving J-PET project.
