An X-ray imaging system includes an X-ray detector; a plurality of X-ray sources configured to illuminate the X-ray detector from different perspectives; a shutter in a transmission plane between each X-ray source controlling transmission of X-rays from each X-ray source to the X-ray detector; and a processor configured to receive and process X-ray data from the X-ray detector. The shutter may be configured to illuminate the X-ray detector alternately with each X-ray source. The processor may determine 3D information about an object from the processed X-ray data. Also provided are methods for processing X-ray data and different embodiments of shutters to alternately illuminate X-ray detectors.