Breast self-examination This method is economical and easy to implement, and can increase women’s alertness to breast cancer. For those who cannot insist on regular breast examination in hospital, they should at least do regular breast self-examination, usually once a month; however, it cannot detect breast cancer at an early stage and cannot reduce the mortality rate. Clinical checkup, i.e. standardized breast checkup by a breast specialist, is recommended once a year, and those with high-risk factors need to be checked more frequently. Ultrasound examination of breast is non-invasive, non-radioactive, and can be repeatedly examined; it is easy to identify cystic and solid lesions and detect lesions that cannot be palpated; the levels are clearly displayed and the positioning is more accurate; it can clearly show axillary and supraclavicular lymph nodes; it is better than molybdenum target for dense breast ultrasound examination; however, it is less effective than molybdenum target for small calcified and burr-like lesions. Our Philips color ultrasound machine is the latest generation of high-end intelligent ultrasound system, using the most advanced high-definition imaging and diagnostic technology, which can provide a higher level of diagnostic performance. Mammography Breast screening is an important tool for breast cancer screening. Our German Siemens Mammomat 3000 mammography machine uses low kilovolts and small doses of soft X-rays to obtain high-contrast, high-resolution breast images, so that some microscopic structures of the breast and small lesions that cannot be touched can be clearly displayed, and the image quality is made clearer through digital processing. Mammography has become one of the most effective and reliable means of diagnosing breast diseases. Breast MRI Breast MRI is of great value for dense breast, multifocal, multicentric, occult breast cancer and sentinel lymph nodes. The superconducting 1.5T MRI machine from Siemens in Germany is the most advanced MRI system at present. It is specially equipped with a dedicated breast imaging system. It can detect breast cancer that cannot be detected by clinical examination and other imaging examinations of the breast, and is non-radioactive, and can accurately describe the location, size, number, margin and bilateral axillary lymph node metastasis of the tumor, which is helpful for the correct clinical staging of breast cancer. Especially, the signal characteristics of lesions, morphological changes, time-signal intensity curve of dynamic enhancement and the enhancement mode of lesions are integrated to have a high correct rate for the detection and qualitative diagnosis of breast diseases.