The incidence of breast disease is increasing year by year, and breast cancer is becoming the first malignant tumor in women. Early, timely and accurate diagnosis of breast cancer is the most important task. What kind of breast examinations should be chosen and what kind of examinations are suitable for those people? A brief introduction will be made. Infrared scan, ultrasound and mammogram are commonly used in clinical practice. In recent years, PCM system, which is used for early detection of micro breast tumor, has made early detection of breast cancer possible. Infrared scan Infrared scan is an examination method that has been used in clinical practice for many years, and it is still widely used in primary units and physical examination and census of breast diseases, but from the clinical point of view, infrared scan has no value in detecting early breast cancer. 2. Color ultrasound Currently, color ultrasound is widely used for breast disease examination, especially for young patients (under 35 years old), patients with benign lesions and lesions that are not visualized by mammography, through color ultrasound examination, a preliminary analysis of benign and malignant lesions can be made based on the boundary, envelope and blood flow of lesions. It is an ideal examination method especially for young women, because young women have dense glands, benign lesions, and benign lesions are close to the density of normal glands, so it is difficult to make a correct judgment by X-ray examination. Especially in some women who have not had children, there is a great harm in exposing the gland to X-rays. In Western countries, mammography is seldom used in breast examinations for young women under 35 years old (unless the doctor considers breast cancer through physical examination). 3. Mammography Mammography began in the 1960s and can better identify various soft tissues and abnormal density changes in the breast, making it possible to detect breast cancer at an early stage and to identify benign and malignant lesions in the breast. In recent years, with the introduction of molybdenum-rhodium dual-target X-ray machines, special films and dark boxes, as well as the integration of fully automatic exposure and digital imaging lamp technology, the images of mammography have become clearer and easier to operate, creating ideal technical equipment conditions for detecting breast cancer. The direct signs of cancer on X-ray mainly include mass nodules and microcalcifications. Malignant masses are often irregular, with burrs on the edges and higher density than the surrounding glands. Microcalcifications are of great clinical importance in the early diagnosis of breast cancer. However, not all mammograms with microcalcified foci are malignant. Calcified spots in breast cancer are usually mud-like, clustered or distributed along ductal segments. If there are more than 15 small calcifications per square meter, breast cancer is often considered. The diagnostic sensitivity and specificity of mammography are affected by the density of the breast or the similarity of the lesion to the surrounding tissue, and mammography may be missed. In addition, X-rays are harmful to the body and may induce breast cancer. However, studies have found that a radiation dose of less than 1 rad for 1 x-ray per year does not affect women over the age of 40. Since the breast gland of young women is sensitive to radiation and the breast tissue is more dense at this time, it is not suitable for mammography for women under 35 years old. Ultrasound and mammogram are the most effective screening tools Combining mammogram and ultrasound is the “golden partner” for early screening of breast cancer, which can effectively detect early breast cancer, thus helping patients to get early detection and treatment, and strive for more treatment opportunities. 5. PCM system At present, the basic principle of imaging in existing mammography machines is to use the absorption contrast of X-rays, which is not enough for high-density breast due to the small difference of X-ray absorption coefficient between breast glandular tissue and tumor tissue. Therefore, many breast cancer patients miss the best time for treatment due to the lack of early detection and diagnosis, which leads to painful or even life-threatening surgical cuts. PCM system closely combines the phase contrast and absorption contrast of X-rays to obtain the edge enhancement effect, which can outline the edges of different adjacent materials distinctly and truly, making the performance of tumor edges and internal structures more fine and clear. Since the PCM system adopts the newly developed breast-specific imaging plate, it uses the principle of magnified imaging and ultra-high precision reading to obtain a large image information volume of nearly 70 million pixels, which provides the possibility of early detection of ultra-small breast cancer. 6. Tips: No kind of auxiliary examination can replace the physical examination by a professional doctor.