Ralf Kurt Willy Schulze,Daniel GROß,Ulrich-Alexander Heil,Elmar Schömer,Ulrich Schwanecke
申请号：
US14422492
公开号：
US20150216498A1
申请日:
2013.08.20
申请国别(地区):
US
年份:
2015
代理人:
摘要：
It is described a method for determining values of geometry parameters of a cone beam computer tomography apparatus, the method comprising: (a) obtaining x-ray projection data captured by the detector from at least three calibration objects arranged at mutually different positions, the x-ray projection data comprising for each calibration object plural projections at different rotation angles (b) determining for each calibration object a respective ellipse representation from the respective plural projections (c) performing a random search across candidate values of the geometry parameters for determining the values of the geometry parameters, wherein a cost function depending on the ellipse representations and the geometry parameters is optimized.
