Inclusion Criteria:  Female subjects aged ≥18 years old; Those who have undergone breast color Doppler ultrasound examination in this hospital, and the results show that there is only a single tumor on either side of the breast; Able to comply with the research procedures specified in this program; Those who have fully understood the study before the experiment, volunteered to participate in the study and signed a written informed consent.  Exclusion Criteria:  Those with incomplete skin (such as scratches, open wounds, ulcers, etc.) in the assessment side breast area; Those who have a history of surgery in the assessment side breast area; Those with persistent or active breast and/or axillary infection on the assessment side; Those who have a history of mental illness and cannot cooperate to complete the trial at present; Subjects deemed unsuitable by the investigator to participate in this study.