Method for calibrating computer tomography system that is utilized for computing e.g. two-dimensional sectional view for examination of heart ventricle of patient, involves determining defect size by iterative minimization of cost function

摘要

The method involves computing image data of an object to be examined using measurement data that are determined during a relative movement between X-ray tubes (C2, C4) of a computer tomography (CT) system (C1) and the object. A defect size is included into an image computation process, where the defect size concerns a measuring system mistake. A cost function is determined using a histogram of the image data, where the cost function is computed as a deviation between the histogram and an ideal histogram. The defect size is determined by iterative minimization of the cost function. Independent claims are also included for the following: (1) a computing unit for reconstruction of image data of an examination object from measurement data of a CT-system (2) a CT-system (3) a computer program comprising a set of instructions for executing a method for calibrating a CT-system (4) a data carrier comprising a set of instructions for executing a method for calibrating a CT-system.