The invention provides a preparation method of several < 68 > Ga labeled
somatostatin receptor (SSTR) probes, and belongs to the technical field of
nuclear medicine radiopharmaceuticals. The SSTR targeting compound
octreotide is structurally modified by changing types and configurations of amino acids, changing disulfide bonds and increasing non-traditional amino acids on the basis of the existing SSTR targeting compound
octreotide, and the series of probes have the advantages of good stability, high targeting property, higher tumor /
normal tissue ratio (target / non-target ratio) and the like. The invention not only has a good application prospect in the aspect of PET / SPECT (
positron emission
tomography /
single photon emission computed tomography) imaging agents of high-expression SSTR diseases, but also has potential advantages in the aspect of radioactive therapy of SSTR high-expression tumors.