An X-ray imaging system, including: a. an X-ray detector, b. a plurality of X-ray sources (1, 2; 28, 29), each X-ray source (1, 2; 28, 29) configured to illuminate the detector from a different perspective, c. a conveyor configured to convey an object through a transmission plane; and d. a shutter (3; 20; 22, 23; 26) in the transmission plane between each X-ray source (1, 2; 28, 29) and detector, wherein the shutter (3; 20; 22, 23; 26) defines a plurality of transmission paths (10, 11) and controls the transmission of X-rays (5, 6) from each X-ray source (1, 2; 28, 29) through the transmission plane to the detector, characterised in that the shutter (3; 20; 22, 23; 26) is configured to alternately allow X-rays (5, 6) generated from two X-ray sources at different positions in the transmission plane to pass through respective transmission paths (10, 11) while the object is conveyed through the transmission plane and is configured such that at most one transmission path (10, 11) is aligned with the transmission plane at any time, and the X-ray imaging system further includes: e. a processor in communication with the detector for receiving and processing X-ray data received from the detector, wherein the X-ray imaging system is configured to image the object when the object is positioned between the shutter (3; 20; 22, 23; 26) and the X-ray detector. a. an X-ray detector, b. a plurality of X-ray sources (1, 2; 28, 29), each X-ray source (1, 2; 28, 29) configured to illuminate the detector from a different perspective, c. a conveyor configured to convey an object through a transmission plane; and d. a shutter (3; 20; 22, 23; 26) in the transmission plane between each X-ray source (1, 2; 28, 29) and detector, wherein the shutter (3; 20; 22, 23; 26) defines a plurality of transmission paths (10, 11) and controls the transmission of X-rays (5, 6) from each X-ray source (1, 2; 28, 29) through the transmission plane to the detector, characterised in that the shutter (3; 20; 22, 23; 26) is configured to alternately allow X-rays (5, 6) generated from two X-ray sources at different positions in the transmission plane to pass through respective transmission paths (10, 11) while the object is conveyed through the transmission plane and is configured such that at most one transmission path (10, 11) is aligned with the transmission plane at any time, and the X-ray imaging system further includes: e. a processor in communication with the detector for receiving and processing X-ray data received from the detector, wherein the X-ray imaging system is configured to image the object when the object is positioned between the shutter (3; 20; 22, 23; 26) and the X-ray detector. the shutter (3; 20; 22, 23; 26) is configured to alternately allow X-rays (5, 6) generated from two X-ray sources at different positions in the transmission plane to pass through respective transmission paths (10, 11) while the object is conveyed through the transmission plane and is configured such that at most one transmission path (10, 11) is aligned with the transmission plane at any time, and the X-ray imaging system further includes: e. a processor in communication with the detector for receiving and processing X-ray data received from the detector, wherein the X-ray imaging system is configured to image the object when the object is positioned between the shutter (3; 20; 22, 23; 26) and the X-ray detector. e. a processor in communication with the detector for receiving and processing X-ray data received from the detector, wherein the X-ray imaging system is configured to image the object when the object is positioned between the shutter (3; 20; 22, 23; 26) and the X-ray detector.