Patent ID: 7496176

Claim:
A method of real-time controlling exposure time in an x-ray apparatus, the apparatus comprising an x-ray source and a displaceable detector arranged to move with a controllable speed across an image exposure area, said detector having a first and a second edge, said first edge being adjacent to a movement direction of said detector, the method comprising the steps of: a. setting a target signal, calculated to obtain a pre-defined signal to noise ratio (SNR), b. setting a detector Region Of Interest (ROI), comprising a sensor in said first edge, c. start scanning, d. collecting a signal from said ROI ( 404 ), e. compensating the signal with respect to at least one of ROI size and efficiency, f. comparing the signal with a target signal (S target ) and calculating a new optimal velocity ( 406 ), and g. setting a new velocity during said scanning.