Participants first undergo an 18F-FDG PET/CT, followed by 68Ga-FAPI04 PET/CT in groups. The purpose of the study is to explore the possibility of superiority of FAPI in diagnosis of colorectal cancer (TNM staging) by the comparison of the two tracers uptake (the maximum of standardized uptake value, SUVmax). Histopathology and conventional imaging follow-up are served as the reference standard.
