发明名称 |
Geometric Characterization and Calibration of a Cone-Beam Computer Tomography Apparatus |
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. |
申请公布号 |
US2015216498(A1) |
申请公布日期 |
2015.08.06 |
申请号 |
US201314422492 |
申请日期 |
2013.08.20 |
申请人 |
ORANGEDENTAL GMBH & CO. KG |
发明人 |
Schulze Ralf Kurt Willy;GROß Daniel;Heil Ulrich-Alexander;Schömer Elmar;Schwanecke Ulrich |
分类号 |
A61B6/00 |
主分类号 |
A61B6/00 |
代理机构 |
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代理人 |
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主权项 |
1. Method for determining values of geometry parameters of a cone beam computer tomography apparatus, the geometry parameters in particular specifying an arrangement of a two-dimensional x-ray detector, an arrangement of a rotation axis of a relative rotation between an object and a mechanically coupled x-ray source/detector system, and an arrangement of a focus of the x-ray source, the method comprising:
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; determining for each calibration object a respective ellipse representation from the respective plural projections; 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. |
地址 |
Biberach DE |