肿瘤是威胁人类健康的重要疾病之一[1]。肿瘤的早期诊断和治疗是提高患者生存质量和治愈率的关键。传统的X线、超声、CT、MRI和PET难以发现早期阶段的肿瘤,对其定位、定性诊断相当困难[2],而随着纳米技术的发展及分子探针在影像学中的不断应用,影像医学已从对传统的解剖和生理功 Tumor is one of the important diseases that threaten human health [1]. Tumor early diagnosis and treatment is to improve the quality of life of patients and the cure rate of the key. The traditional X-ray, ultrasonography, CT, MRI and PET are difficult to detect early stage tumors, which are difficult to locate and diagnose. [2] With the development of nanotechnology and the continuous application of molecular probes in imaging, Medical imaging has evolved from traditional anatomy and physiology