A system and method for determining a position of a focal spot of an X-ray source may be provided. The system may include a shelter to attenuate X-rays emitted from the focal spot of the X-ray source and an X-ray receiver to receive X-rays. The X-ray receiver may include a plurality of X-ray receiving regions. At least one of the plurality of X-ray receiving regions may X-rays that include attenuated X-rays by the shelter and unattenuated X-rays. The shelter and the X-ray receiver may reside between the X-ray source and an X-ray detector for determining the position of the focal spot.
