研究目的
To evaluate the possibility of modulation layer based dual energy cone-beam CT by analyzing x-ray spectrum for various thicknesses of modulation layers.
研究成果
The modulation layer with 2.0 mm thickness can increase mean energies of energy spectra as 1.67 and 1.52 times than original mean energies for 80 and 120 kVp, respectively. Therefore, the modulation layer can generate virtual dual-energy x-ray source, one has the original peak tube voltage and the other has higher peak tube voltage than original one as 1.6 times.
研究不足
The study focused on the analysis of beam hardening effect by the mean energies of the x-ray spectra for various thicknesses of modulation layers. The quality of images acquired by modulation layer based dual energy cone-beam CT was not evaluated in this study.
1：Experimental Design and Method Selection:
Monte Carlo simulation was used to analyze x-ray spectrum for various thicknesses of modulation layers. The experiment was performed on prototype cone-beam CT for 50～100 kVp with CdTe XR-100T detector.
2：Sample Selection and Data Sources:
The energy spectra were acquired for two peak tube voltages such as 80 and 120 kVp with x-ray window blocked and unblocked by modulation layer.
3：List of Experimental Equipment and Materials:
Prototype cone-beam CT, CdTe XR-100T detector, modulation layers of various thicknesses (0.3, 1.0, and 2.0 mm).
4：3, 0, and 0 mm).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The mean energies of energy spectra acquired by Monte Carlo simulation were compared with that of measured energy spectra by Amptek XR-100T CdTe detector.
5：Data Analysis Methods:
The beam hardening effects were evaluated by comparing the mean energies of energy spectra.
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