Breast ultrasound is breast ultrasound. Mammography and breast ultrasound are common clinical examinations for breast disease and are commonly used for breast cancer patients. They can be used in combination to facilitate the diagnosis and treatment of breast lesions and allow for faster screening of patients with breast lesions for early diagnosis and treatment. The difference between mammography and breast ultrasound can include the following points: 1. Examination principle: mammography detects the patient’s breast through X-ray photography, which is a combination of radiation technology and modern computer technology for digital image detection, and can help doctors to detect and diagnose benign and malignant tumors at an early stage. Breast ultrasound, on the other hand, is used to monitor lesions in the breast through two-dimensional ultrasound imaging and color Doppler flow imaging, which is also less expensive. 2. The patient takes a seated position with the upper body exposed and the breasts naturally drooping, and the equipment is tested according to the procedure. During breast ultrasound examination, the patient usually takes a supine position, exposing the breasts, and the examination is performed by applying a coupling agent and probing the skin with the probe; 3. It is therefore contraindicated in women with acute mastitis, lactation or pregnancy. Breast ultrasound is more advantageous in high-density mammography, without radiation, and has a wider range of application; 4. Breast ultrasound is suitable for detecting breast nodules, cysts, tumors and other routine examinations. It can accurately locate nodules, cysts and tumors, and can make preliminary judgments on the nature of lesions by observing size, morphology, structure and echogenicity, but the detection rate of microcalcifications is lower. Simply put, mammography is better for calcification diagnosis and ultrasound is better for soft tissue and cyst diagnosis. Patients should choose the appropriate examination modality according to their own situation and under the advice of their doctors in order to achieve better examination results.