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X-ray flat-panel detector geometry correction to improve dimensional computed tomography measurements
- Source :
- Measurement Science and Technology. 31:035002
- Publication Year :
- 2019
- Publisher :
- IOP Publishing, 2019.
-
Abstract
- To improve the accuracy of dimensional x-ray computed tomography (CT), error sources have to be characterised and accounted for. A variety of error sources have been comprehensively described in the literature. However, the influence of geometrical distortion of the flat-panel detector has rarely been considered. In this paper, the deviation from nominal geometry of a flat-panel x-ray detector was characterised using a calibrated ball plate. In-plane deviations were separated from the detector topography by varying the source–detector distance, resulting in a 3D detector geometry. A correction model for arbitrary source–detector distances was developed, which reduced the maximum errors of sphere centre-to-centre distances in scale-corrected CT measurements from ±3.9 µm to below ±0.8 µm. This fivefold improvement emphasises the importance of such correction for dimensional CT.
- Subjects :
- Physics
medicine.diagnostic_test
Physics::Instrumentation and Detectors
Applied Mathematics
Detector geometry
Detector
X-ray
Computed tomography
Geometry
01 natural sciences
Geometric distortion
Flat panel detector
010309 optics
Dimensional metrology
0103 physical sciences
medicine
High Energy Physics::Experiment
Error detection and correction
Instrumentation
Engineering (miscellaneous)
Subjects
Details
- ISSN :
- 13616501 and 09570233
- Volume :
- 31
- Database :
- OpenAIRE
- Journal :
- Measurement Science and Technology
- Accession number :
- edsair.doi...........e73ee5731212fca15fe91c0af09bd9a3