Patent ID: 6748043
Filing Date: 2004-06-08
Classification: G01N,H05G

Abstract:
A method of stabilizing the calculation of CT (computed tomography) numbers by a CT system, the CT system including an x-ray source for generating x-rays in response to a voltage supplied by a voltage source, the method comprising:a) calculating the CT number of a sample having a known CT number value; b) adjusting the voltage supplied by the voltage source to a reference level for which the calculation in step (a) yields said known CT number value; and c) measuring the energy spectrum of the x-rays generated by the x-ray source; d) adaptively regulating the voltage based on the spectrum measured in step (c), so as to prevent any deviation in the voltage from said reference level determined in step (b); and e) maintaining the voltage substantially constant at said reference level by repeating steps (c) and (d) during subsequent CT number measurements by said CT system.