Color ultrasound and CT are not more accurate. Color ultrasound uses the principle of ultrasound echo, while CT uses the principle of ray scanning, and the two complement and corroborate each other. In comparison, color ultrasound is cheaper and has no radiation, while CT has a certain amount of radiation, so color ultrasound is chosen as a medical examination item for census. There are individual diseases that can be shown on color ultrasound but not on CT, and there are individual diseases that can be shown on CT but not on color ultrasound, so the two examinations are complementary to each other. If there is a discrepancy between the two tests, further MRI or other relevant in-depth tests can be considered for differentiation.