Among CT and ultrasound, CT examination is more accurate for the liver. 1. Ultrasound is a non-surgical diagnostic examination. Ultrasound has the physical properties of reflection, refraction, scattering, attenuation and absorption. Ultrasound is the preferred method for diagnosing liver cancer, which is inexpensive, simple and easy to perform. It can detect occupying lesions with a diameter of more than 1cm, understand the blood supply status of the lesion to determine the benignness or malignancy of the occupying lesion, and can guide the biopsy by liver puncture. However, ultrasound is particularly susceptible to gas and bone-covered organs, so it is easily affected by the operator’s skills. 2.CT examination is a relatively advanced medical imaging examination technology in current clinical practice, which is based on the principle of using X-rays to scan the patient’s body structure, and after the scanning is finished, the computer will convert the scanning information into image information for output. CT can better display liver lesions and is an important examination tool for diagnosis and determining treatment. Enhanced CT is an important method for the diagnosis of tiny lesions of the digestive system, isodense foci, lesions that require localization and characterization, and vascular lesions. Although the sensitivity and accuracy of this method is very high, it should be used with caution in cases of liver and kidney insufficiency. Ultrasound and CT have their own strengths and are generally used in combination in clinical practice to better serve patients.