| 摘要 |
A system for recording computed tomography image data of an object in an object area (4) comprises an X-ray source (5) and an X-ray detector (6) arranged at either side of the object area, the X-ray source having a flying focal spot (5a) from which X-rays is emitted and the X-ray detector comprising pixels (6a) arranged in at least one row for recording images of the object. A device (10a) is provided for rotating the X-ray source and the X-ray detector with respect to the object around an axis of rotation (12), while the at least one row of pixels record images of the object. The X-ray source comprises means (5b) for moving the flying focal spot of the X-ray source from an original position and in a direction essentially opposite to the direction the X-ray source moves during the rotation, and the X-ray detector is provided with means (6b) for time delay summation such that pixel signal values of the at least one row of pixels are shifted one pixel and summed with pixel signal values obtained in a following recording of an image, wherein the shifting and summing of pixel signal values are performed repeatedly and the pixel signal values are shifted in a direction essentially opposite to the direction the X-ray detector moves during the rotation. |
