An X-ray tube comprising: a cathode; an anode; wherein the anode has a disc-shape and is adapted for rotating around a y-direction; wherein the cathode comprises a first electron emitter adapted for emitting a first electron beam for generating a first focal spot on the anode and a second electron emitter adapted for emitting a second electron beam for generating a second focal spot on the anode at a focal spot position distinct from the focal spot position of the first focal spot; wherein the first and second electron emitters (15, 19) are each adapted for emitting a respective electron beam (17, 21) in a y-direction towards the anode; wherein the first and second electron emitters (15, 19) are adapted such that the first and second focal spots (25, 27) are aligned in an x-direction perpendicular to the y-direction and perpendicular to the z-direction; wherein the anode has an X-ray emitting surface for emitting X-rays (29, 31) substantially in a z-direction perpendicular to the y-direction upon incidence of one of the electron beams (17, 19), the X-ray emitting surface being slanted at an angle (α) with respect to the y-direction; and wherein the first and second electron emitters (15, 19) are displaced with respect to each other in the z-direction; wherein the first and the second electron emitters (15, 19) are spaced apart from each other in the x-direction; wherein the first and second electron emitters (15, 19) comprise first and second heatable filaments (33, 35), respectively, arranged parallel to each other and are displaced in the z-direction with respect to each other; wherein each electron emitter (15, 19) comprises an associated switchable grid (37, 39) for blocking the respective emitted electron beam (17, 21). a cathode; an anode; wherein the anode has a disc-shape and is adapted for rotating around a y-direction; wherein the cathode comprises a first electron emitter adapted for emitting a first electron beam for generating a first focal spot on the anode and a second electron emitter adapted for emitting a second electron beam for generating a second focal spot on the anode at a focal spot position distinct from the focal spot position of the first focal spot; wherein the first and second electron emitters (15, 19) are each adapted for emitting a respective electron beam (17, 21) in a y-direction towards the anode; wherein the first and second electron emitters (15, 19) are adapted such that the first and second focal spots (25, 27) are aligned in an x-direction perpendicular to the y-direction and perpendicular to the z-direction; wherein the anode has an X-ray emitting surface for emitting X-rays (29, 31) substantially in a z-direction perpendicular to the y-direction upon incidence of one of the electron beams (17, 19), the X-ray emitting surface being slanted at an angle (α) with respect to the y-direction; and wherein the first and second electron emitters (15, 19) are displaced with respect to each other in the z-direction; wherein the first and the second electron emitters (15, 19) are spaced apart from each other in the x-direction; wherein the first and second electron emitters (15, 19) comprise first and second heatable filaments (33, 35), respectively, arranged parallel to each other and are displaced in the z-direction with respect to each other; wherein each electron emitter (15, 19) comprises an associated switchable grid (37, 39) for blocking the respective emitted electron beam (17, 21).