Quantitative measurement and verification of X-ray intensity variations after interaction with substances by reverse fitting method(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2018年第3期
- Page:
- 296-302
- Research Field:
- 医学影像物理
- Publishing date:
Info
- Title:
- Quantitative measurement and verification of X-ray intensity variations after interaction with substances by reverse fitting method
- Author(s):
- LIU Yirong; LIU Jinyuan; NIU Xiangyu; QIN Ruiping
- School of Medical Imaging, Hebei Medical University, Shijiazhuang 050000, China
- Keywords:
- ; X-ray intensity; attenuation; reverse fitting method; experimental teaching; X-ray diffractometer
- PACS:
- O434.1
- DOI:
- DOI:10.3969/j.issn.1005-202X.2018.03.010
- Abstract:
- Objective To propose a reverse fitting method using X-ray diffractometer and homemade experiment stage for quantitatively analyzing the changes of X-ray intensity and influence factors after X-ray interacting with different substances. Methods Langbobier law was verified by inverse fitting method in this experiment. Several factors that might affect X-ray intensity after X-ray passing through the material layer were enumerated, such as tube voltage, tube current, distance, atomic number, thickness of the substance and so on. Moreover, multiple sets of experimental samples were designed for the experimental verification of these influence factors, which reversely illustrated the relationship between influence factors and X-ray intensity after passing through the material layer. Results Within the effective range of X-ray diffractometer, tube current, the thickness and atomic number of the material layer were linearly related to X-ray intensity after passing through the material layer; tube voltage, the distance between X-ray transmitter and receiver were nonlinear with X-ray intensity after passing through the material layer. When the tube voltage changed linearly, X-ray intensity after passing through the material layer increased slowly under the tube voltage in the range of 10 kV to 25 kV, and increased rapidly under the tube voltage of 25 kV to 35 kV (X-ray intensity ∝KV2). When the distance between X-ray transmitter and receiver was linearly changed, X-ray intensity passing through the material layer changed significantly under the distance of 9.00 cm to 13.00 cm, while in the range of 13.00 cm to17.00 cm, the changes of X-ray intensity was not obvious (X-ray intensity ∝1/r2). Through the above findings, we verified the correctness and universality of Langbobier law, and based on it, explored the further experimental research using phantom. Conclusion The proposed method which is simple and intuitive can be used in related medical physics experimental teaching for it can accurately and conveniently determine the law of X-ray intensity variations after X-ray interacting with different substances, and verify the relevant influence factors.
Last Update: 2018-03-21