中文摘要：

纳米抗体是一种由骆驼源的重链可变区组成的单域抗体，具有相对分子质量小、亲和力高和化学稳定性好等特性，非常适于进行肿瘤以及其他疾病的PET、SPECT显像和辅助治疗研究。纳米抗体在分子影像诊断方面的优势很可能使其成为新一代核医学显像剂。

英文摘要：

Nanobodies, which occur naturally in Camelidae animals, are the functional heavy chain antibodies without light chains. Having the relative properties of small size, high stability, good solubility and targeting effect, nanobodies have a great potential in PET and SPECT imaging for the diagnosis and treatment of diseases, such as tumor and infectious disease. Radio-labeled nanobodies might have potential to become the molecular imaging probes of the next generation.