CT is used to measure the absorption coefficient of X ray in the object, and the X ray of different energy levels can obtain different X ray attenuation coefficients. These coefficients will be reconstructed into CT images, which we call spectral imaging. It has the characteristics of fast scanning speed, multi-parameter and quantitative analysis. The single energy image, the specific energy spectrum curve, the effective atomic number and the base material image as well as other imaging techniques of the spectral CT are of great value in the identification of isolation of benign and malignant lung nodules, analysis of the pothologic type, evaluation of lung cancer lymph node metastasis or not, and evaluation of clinical therapeutic effect. It can not only accurately direct that stage and make further diagnosis plan for the clinical treatment, but also can improve the quality of life and the prognosis of the patient. The application of spectral CT in the diagnosis of lung cancer was reviewed in this paper.%CT是通过测量X线在物体中的吸收系数进行成像的,不同能量级别的X线可得到不同的X线衰减系数,将其重建成CT图像即为能谱成像,具有扫描速度快、多参数、定量分析等特点.能谱CT的单能量图像、特异能谱曲线、有效原子序数以及基物质图像等成像技术在鉴别孤立性肺结节的良恶性、分析病理类型、评估肺癌淋巴结转移与否、评价临床治疗效果等方面具有重要价值,不但能够准确指导临床进行肺癌分期及制定进一步诊疗计划,还有利于提高患者的生存质量和预后.本文就能谱CT在肺癌诊断中的应用作以综述.
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