1. A method for computing volumetric perfusion in a spatially stationary organ using a computed tomography (CT) imaging system having a field of view, said method comprising: positioning an area detector such that the area detector encompasses a spatially stationary organ within the field of view of the imaging system for all view angles; operating the CT imaging system in a cine mode to acquire a plurality of projection data representative of the tissue dynamics in the spatially stationary organ; generating reconstructions of the contrast dynamics of the tissue using the projection data; and computing the volumetric perfusion in the organ using the reconstructions of the projection data representative of the tissue dynamics.