Knowing the X-ray spectrum is important to dual energy computed tomography(DECT)reconstruction. Whereas the spectrum is not always available in practice. In addition, the reconstructed image of DECT is extremely sensitive to noise which demands special noise suppression strategy in reconstruction algorithm design. In this paper, we develop an iterative algorithm with simultaneously updating the spectrum and the image of DECT, which did not need the knowledge of the spectrum in advance. Namely, spectrum esti...
【基金】
国家重点研发计划(2016YFA0202003);
国家自然科学基金(61571359)
【更新日期】
2018-01-31
【分类号】
TP391.41
【正文快照】
双能量CT(dual energy computed tomography,DECT)在材料分解、骨密度检测和无损检测方面具有重要的作用[1-4]。在DECT扫描下,可以得到高、低能谱下的投影数据。利用这一组投影数据,可以重建得到电子密度图像和有效原子序数图像,或者基材料密度图像。近10年来,已有的DECT重建方