Patent ID: 11879856
Assignee: CANON MEDICAL SYSTEMS CORPORATION
Field: Measurement (Instruments)
Classification: CPC G  A | IPC A  G

Claim 8:
9. A method for calibrating a response of a photon counting detector (PCD) for material decomposition in a photon counting computed tomography (CT) system, the method comprising:
(1) at each pixel, performing a plurality of low flux scans comprising phantom scans to obtain counts for each energy bin;
(2) estimating first parameters, which are dependent on energy, based on the counts;
(3) repeating (1) for different current intensities and at a same tube voltage and using same phantoms, to obtain a universal table of estimated second parameters which are dependent to total counts of all energy bins based on the first parameters, in an entire current intensity range; and
(4) performing a material decomposition in object/patient scans to estimate basis material based on the first and the second parameters.