歯科放射線

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Background and purpose: At the Laboratory for Electron Beam Research and Application (LEBRA) institute of Quantum science Nihon University, parametric X-ray radiation (PXR) can be generated. LEBRA-PXR is quasi-monochromatic X-ray radiation in which the wavelength, amplitude, and phase are coherent along the vertical direction, and the wavelength can be varied linearly along the horizontal direction. At LEBRA, we can currently generate X-rays at any energy within a range of approximately 5-35keV. The objective of this study was to carry out a detailed investigation of absorption contrast images acquired using LEBRA-PXR.
Materials and methods: The experiment used a triangular prism-shaped phantom containing iodine contrast media. The LEBRA-PXR imaging conditions were a energy of 33.17 or 26.7keV, a macropulse duration of 5×10⁻⁶sec, a repetition rate of 2Hz and an exposure time of 30 min. The White X-ray (WXR) imaging conditions were a tube voltage of 40kV, a tube current of 120mA, and an exposure time of 20×10⁻³sec.
Results: Images of the contrast media scanned at 33.17keV exhibited a sudden change in pixel value at the boundary in the center of the phantom. In other images, the pixel value was uniform, and in the vertical direction the change in pixel value was mostly linear. For imaging carried out at the same wavelength, the pixel value varied for different objects.
Conclusions: The results of this study suggested that the possibility of LEBRA-PXR to use for diagnostic imaging. Since LEBRA-PXR is quasi-monochromatic X-ray radiation with a single wavelength in the vertical direction, it may also be possible to carry out studies concerning beam hardening artifacts.

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