Inclusion Criteria:

1. Age of 18-80 years old, both sexes, with behavioral capacity;
2. patients with suspected or confirmed hematological malignancies;
3. 18F-FDG PET or other imaging examinations should be performed according to the treatment plan;
4. For suspected patients, biopsy or needle biopsy is expected to obtain pathological results;
5. Can provide informed consent, can understand and comply with the requirements of the study.

Exclusion Criteria:

1. pregnant and lactating women;
2. patients with fear or radiophobia, or with mental disorder or primary affective disorder;
3. received ionizing radiation outside the scope of this study for clinical medical or scientific research purposes within the past year, resulting in an annual radiation exposure dose exceeding 50 mSv;
4. received investigational drugs or devices of uncertain efficacy or safety within 1 month;
5. Any condition that the chairpersons of the study consider that any link related to the study may cause harm or have potential harm.