1. A method for producing a time-resolved three-dimensional image of a subject, the method comprising: acquiring image data from the subject using a single rotation of a rotational medical imaging system over a time period, wherein a single contrast agent injection is administered to the subject during a portion of the time period; generating a time-series of two-dimensional images from the acquired image data, each of the two-dimensional images corresponding to a different time in the time period and a different angle relative to the subject, wherein each of the two-dimensional images comprises pixel intensity information; reconstructing a three-dimensional image without temporal resolution from the acquired image data; determining, for each of a plurality of the two-dimensional images, voxel weightings in the three-dimensional image without temporal resolution by multiplying the voxels with the pixel intensity information of a two-dimensional image in the plurality; and producing a time-resolved three-dimensional image of the subject by selectively combining the three-dimensional image without temporal resolution and the time-series of two-dimensional images, the voxel weightings being used to nullify one or more voxels from the three-dimensional image without temporal resolution to produce the time-resolved three-dimensional image.