东南大学学报（自然科学版）2016，Vol.46Issue(6)：1126-1131,6.DOI:10.3969/j.issn.1001-0505.2016.06.003
基于投影加权的多能光子计数X线CT全能谱图像重建改进方法
Improved projection-based weighting method for full spectral image reconstruction of multi-energy photon counting X-ray CT
摘要
Abstract
To improve the contrast-to-noise ratio (CNR)of the full spectral reconstructed image of multi-energy photon counting X-ray computed tomography (CT ),an improved projection-based weighting method for image reconstruction is proposed.First,the projection simulation for three kinds of phantom including different contrast materials was carried out and the projection sinograms with Poisson noise and Gaussian noise were obtained.Then,the noise information was extracted from these sinograms,and the CNR optimization function with regard to the weights was formula-ted.Finally,the optimal weights were figured out and used for the projection-based weighting image reconstruction,and the reconstructed images are evaluated.The experimental results show that, compared with the current projection-based weighting image reconstruction method considering Pois-son noise only,the proposed method can obviously improve the CNR of the reconstructed image for the phantom containing contrast material calcium.However,there is no statistically significant difference in CNR for the phantoms containing either iodine or contrast material soft tissue.关键词
光子计数/X线CT/投影/加权/图像重建Key words
photon counting/X-ray computed tomography (CT)/projection/weighting/image re-construction分类
信息技术与安全科学引用本文复制引用
周正东,管绍林,余子丽,张雯雯..基于投影加权的多能光子计数X线CT全能谱图像重建改进方法[J].东南大学学报（自然科学版）,2016,46(6):1126-1131,6.基金项目
国家自然科学基金资助项目（51575256）、中央高校基本科研业务费专项资金资助项目（NP2015101）、江苏高校优势学科建设工程资助项目． （）
