CAJ | 학술논문

常规固定电压CT重建，由于过曝光和欠曝光导致的不完全投影信息，成像质量差，为此提出变电压CT重建。通过变电压获得跟工件有效厚度相匹配的有效投影序列，在ART迭代图像的基础上，调整全变差使其最小化，来优化重建。在重建过程中，依据灰度加权，把低电压的重建图像作为初值，应用在相邻高电压有效投影重建中，得到相邻高电压的重建图像，依次类推直至最高电压，工件的全部结构信息重建完毕。实验表明，灰度加权算法不仅实现了变电压图像信息的完整重建，像素值也更加稳定。
상규고정전압CT중건，유우과폭광화흠폭광도치적불완전투영신식，성상질량차，위차제출변전압CT중건。통과변전압획득근공건유효후도상필배적유효투영서렬，재ART질대도상적기출상，조정전변차사기최소화，래우화중건。재중건과정중，의거회도가권，파저전압적중건도상작위초치，응용재상린고전압유효투영중건중，득도상린고전압적중건도상，의차유추직지최고전압，공건적전부결구신식중건완필。실험표명，회도가권산법불부실현료변전압도상신식적완정중건，상소치야경가은정。
In conventional CT reconstruction based on fixed Voltage, the projective data often appears overex-posed or underexposed, and so the reconstructive results are poor.To solve this problem, variable voltage CT reconstruction has advanced.The effective projective sequences of a structural component are obtained through the variable voltages.Adjust and minimize the total variation to optimize the reconstructive results on the basis of iterative image using ART algorithm.In the process of reconstruction, the reconstructive image of the low voltage is used as an initial value of the effective projective reconstruction of the adjacent high voltage, and so on until to the highest voltage according to the gray weighted algorithm.That is to say the complete structural information is reconstructed.Experiment shows that the proposed algorithm can completely reflect the informa-tion of a complicated structural component, and the pixel values are more stable.