Patent ID: 8649479

Claim:
An x-ray computed tomography (CT) system comprising: a rotating gantry; an x-ray source coupled to the gantry for generating an x-ray beam; an x-ray detector coupled to the gantry for detecting x-rays of the x-ray beam; an adjustable collimator coupled to the x-ray source and configured to adjust a focus of the x-ray beam generated by the x-ray source; a controller configured to control the collimator to adjust the focus on a region of interest (ROI) and to control a beam intensity for the x-ray beam generated by the x-ray source during a scan; and a patient table supporting a patient thereon and wherein the controller is configured to decrease the beam intensity when the x-ray source is closer to the ROI of the patient and to increase the beam intensity when the x-ray source is farther away from the ROI.