针对传统的X射线CT系统因采用积分探测器难于区分材质细微差别的关键技术问题, 基于MARS X射线能谱CT系统, 开展了彩色CT成像技术研究。研究结果表明, 对被碘溶液腐蚀的橡胶管和注射有新型造影剂(金纳米微粒)的小老鼠进行多个X射线能量段的CT断层扫描, 提取和量化不同能量范围橡胶管投影数据和小老鼠的CT图像, 重建出橡胶管彩色投影图像和小老鼠胸腔彩色CT图像, 展现了橡胶管内部复杂结构及金纳米微粒主要集中于小老鼠胸腔上部血管的信息, 显示了X射线能谱CT刻画物质信息的细微差别能力和呈现物质不同组成成分的能力。

The typical conventional CT system employs the digital integrating sensor. It is difficult to identify X-ray attenuation characteristics for different materials. This paper focuses on color CT imaging technique based on MARS X-ray spectral CT system to analyze different materials. In experimental study, we scan the rubber tube corroded by iodine solution and a mouse injected with a contrast agent (Gold Nanoparticles (GNP)) in different energy ranges, and extract and quantify X-ray energy spectrum information to reconstructed color projection images of the rubber tube and color CT image of the mouse chest. The pictures demonstrate the complex structure of the rubber tube and concentration information of the gold particles in the mouse chest. X-ray spectral CT could represent more richer structure information and different composition of materials.