This is a small-sample safety study involving 15 healthy volunteers who were divided into groups and underwent 68Ga-ACC-DE, 68Ga-FASN-DE, and 68Ga-ACLY-DE PET/CT imaging for safety, biodistribution, and radiation dosimetry assessments, laying the foundation for subsequent studies on the efficacy of resistance monitoring in melanoma targeted therapy.

Inclusion Criteria:

• Age: 18 to 65 years old (including the boundary values); Gender: Male or female; Weight: Male weight ≥ 50 kg, female weight ≥ 45 kg, and body mass index (BMI = weight (kg) / height² (m²)) within the range of 18.0 to 28.0 kg/m² (including boundary values); Participants must fully understand and voluntarily participate in this experiment and sign an informed consent form.

Exclusion Criteria:

• Individuals who cannot tolerate intravenous administration (e.g., those with a history of fainting from needles or blood); Individuals with alcohol allergies; Pregnant or breastfeeding women; Individuals with severe diseases of the heart, kidneys, lungs, blood vessels, nervous system, or mental health, immune deficiency diseases, or hepatitis/cirrhosis; Individuals whom the investigator deems unsuitable for or unable to complete PET or other imaging examinations for special reasons; Other circumstances deemed by the investigator to be unsuitable for participation in this study.