METHOD AND DEVICE FOR DETERMINING CENTER OF ROTATION OF CT

摘要

Provided are a method and device for determining a center of rotation (COR) of computed tomography (CT), the method comprising: according to a predetermined incremental step length Θ, using CT pending test to rotationally scan an object pending test in order to obtain projection values of each detector pixel at different rotation angles; obtaining projection values of the detector pixel m at different rotation angles; dividing the projection values into a first sequence and a second sequence; respectively calculating a cross correlation coefficient between the first sequence and the second sequence in each detector pixel to form a sequence R(m) of the cross correlation coefficients; traversing through the sequence R(m) of the cross correlation coefficients and searching for a detector pixel corresponding to the maximum value in the sequence R(m) as a central pixel; determining the COR of the CT pending test according to the position of the central pixel. The method and device can quickly and precisely determine the COR of the CT pending test by simply scanning an object pending test and calculating the acquired raw data, without using a dedicated correction model.