Inclusion Criteria:  Adult patients (age 18 years or above), gender is not limited; Patients with clinically suspected or confirmed heart failure (supporting evidence includes visual examination, cardiac MRI, cardiac ultrasound, and serological indicators, etc.), and patients who agree to undergo 68Ga-FAPI and 13N-NH3 imaging; The patient or his legal representative can sign the informed consent.  Exclusion Criteria:  Acute systemic diseases and electrolyte disorders； Pregnant or lactating women； Patients refuse to sign the informed consent.