This is a single-arm imaging study using DOTATOC peptide, labelled with the Gallium (68Ga) tracer.

Inclusion Criteria:

1. Able and willing to provide a written informed consent;
2. 18~75 years old,male or female；
3. ECOG performance status 0 or 1;
4. Confirmed or suspicion of GEP-NET.

Exclusion Criteria:

1. Unable to lie flat for the entire imaging duration (e.g. persistent cough, claustrophobia, severe arthritis, etc.), unable to enter the PET/CT device;
2. Individuals planning to be pregnant, and lactating women;
3. Individuals with concurrent active infections or with unexplained fever >38.5°C for more than 1 hour during the screening period or prior to administration of investigational medication.