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- W2095280610 abstract "For accurate CT reconstruction, it is important to know the geometric position of every detector channel relative to the X-ray source and the rotation axis. Often, such as for truly equally spaced detectors, it may suffice just to accurately know the gross geometry. However, for some detector designs, a detailed description of the fine-scale channel locations may also be necessary. While there are numerous methods to perform fine-scale calibration, such methods generallyassume a continuous distortion (typically for image intensifiers) and are thus unsuitable for detectors with discrete distortions such as irregularly placed discrete sensors, tiled flat panels, or multiple flat segments arranged to form a polygonal approximation to an arc. In this paper, a method is proposed to measure both gross and fine geometry from a single simple calibration scan in a way that properly characterizes discrete irregularities. Experimental results show theproposed method to be rather effective on polygonal arrays. While the method is derived and demonstrated for fan beam, a discussion is given on extending it to cone beam CT." @default.
- W2095280610 created "2016-06-24" @default.
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- W2095280610 date "2009-02-26" @default.
- W2095280610 modified "2023-09-23" @default.
- W2095280610 title "Geometric calibration of detectors with discrete irregularities for computed tomography" @default.
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- W2095280610 doi "https://doi.org/10.1117/12.811643" @default.
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