Geometrical Calibration of a 2.5D Periapical Radiography System
The objective of this study was to develop a geometrical calibration method applicable to the 2.5D prototype Periapical Radiography System and estimate component position errors. A two-steel-ball phantom with a precisely known position was placed in front of a digital X-ray sensor for two-stage cali...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-01-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/10/3/906 |
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| author | Che-Wei Liao Ming-Tzu Tsai Heng-Li Huang Lih-Jyh Fuh Yen-Lin Liu Zhi-Teng Su Jui-Ting Hsu |
| author_facet | Che-Wei Liao Ming-Tzu Tsai Heng-Li Huang Lih-Jyh Fuh Yen-Lin Liu Zhi-Teng Su Jui-Ting Hsu |
| author_sort | Che-Wei Liao |
| collection | DOAJ |
| description | The objective of this study was to develop a geometrical calibration method applicable to the 2.5D prototype Periapical Radiography System and estimate component position errors. A two-steel-ball phantom with a precisely known position was placed in front of a digital X-ray sensor for two-stage calibration. In the first stage, the following three parameters were estimated: (1) r, the distance between the focal spot and the rotation axis of the X-ray tube; (2) ψ, the included angle between the straight line formed by the X-ray tube’s focal spot and rotation axis and the straight line of the orthogonal sensor; and (3) L<sub>4</sub>, the distance between the rotation axis and the plane where the two steel balls were positioned. In the second stage, the steel balls’ positions were determined to calculate the positions of the X-ray tube on the x, y, and z axes. Computer simulation was used to verify the accuracy of the calibration method. The results indicate that for the calibration approach proposed in this study, the differences between the estimated errors and setting errors were smaller than 0.15% in the first and second stages, which is highly accurate, verifying its applicability to accurate calibration of the 2.5D Periapical Radiography System. |
| first_indexed | 2024-12-21T10:34:47Z |
| format | Article |
| id | doaj.art-5ca30a7bf1b741e99acbfe6a385a482a |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-12-21T10:34:47Z |
| publishDate | 2020-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-5ca30a7bf1b741e99acbfe6a385a482a2022-12-21T19:07:05ZengMDPI AGApplied Sciences2076-34172020-01-0110390610.3390/app10030906app10030906Geometrical Calibration of a 2.5D Periapical Radiography SystemChe-Wei Liao0Ming-Tzu Tsai1Heng-Li Huang2Lih-Jyh Fuh3Yen-Lin Liu4Zhi-Teng Su5Jui-Ting Hsu6Graduate Institute of Biomedical Sciences, China Medical University, Taichung 404, TaiwanDepartment of Biomedical Engineering, Hungkuang University, Taichung 433, TaiwanSchool of Dentistry, College of Dentistry, China Medical University, Taichung 404, TaiwanSchool of Dentistry, College of Dentistry, China Medical University, Taichung 404, TaiwanDepartment of Biomedical Imaging and Radiological Science, China Medical University, Taichung 404, TaiwanSchool of Dentistry, College of Dentistry, China Medical University, Taichung 404, TaiwanSchool of Dentistry, College of Dentistry, China Medical University, Taichung 404, TaiwanThe objective of this study was to develop a geometrical calibration method applicable to the 2.5D prototype Periapical Radiography System and estimate component position errors. A two-steel-ball phantom with a precisely known position was placed in front of a digital X-ray sensor for two-stage calibration. In the first stage, the following three parameters were estimated: (1) r, the distance between the focal spot and the rotation axis of the X-ray tube; (2) ψ, the included angle between the straight line formed by the X-ray tube’s focal spot and rotation axis and the straight line of the orthogonal sensor; and (3) L<sub>4</sub>, the distance between the rotation axis and the plane where the two steel balls were positioned. In the second stage, the steel balls’ positions were determined to calculate the positions of the X-ray tube on the x, y, and z axes. Computer simulation was used to verify the accuracy of the calibration method. The results indicate that for the calibration approach proposed in this study, the differences between the estimated errors and setting errors were smaller than 0.15% in the first and second stages, which is highly accurate, verifying its applicability to accurate calibration of the 2.5D Periapical Radiography System.https://www.mdpi.com/2076-3417/10/3/906geometric calibrationperiapical radiographycomputed tomosynthesisquasi-3d imaging2.5d |
| spellingShingle | Che-Wei Liao Ming-Tzu Tsai Heng-Li Huang Lih-Jyh Fuh Yen-Lin Liu Zhi-Teng Su Jui-Ting Hsu Geometrical Calibration of a 2.5D Periapical Radiography System Applied Sciences geometric calibration periapical radiography computed tomosynthesis quasi-3d imaging 2.5d |
| title | Geometrical Calibration of a 2.5D Periapical Radiography System |
| title_full | Geometrical Calibration of a 2.5D Periapical Radiography System |
| title_fullStr | Geometrical Calibration of a 2.5D Periapical Radiography System |
| title_full_unstemmed | Geometrical Calibration of a 2.5D Periapical Radiography System |
| title_short | Geometrical Calibration of a 2.5D Periapical Radiography System |
| title_sort | geometrical calibration of a 2 5d periapical radiography system |
| topic | geometric calibration periapical radiography computed tomosynthesis quasi-3d imaging 2.5d |
| url | https://www.mdpi.com/2076-3417/10/3/906 |
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