Linear strong echoes are echoes that show a strong linear density when the patient undergoes an ultrasound examination. Generally, calcified foci, stones and other internal dense tissue may have a significant deep impedance difference with the surrounding soft tissues or fluids, which in turn leads to strong echoes. The reasons for strong echoes may vary from one examination site to another. If liver ultrasound shows linear strong echoes, it may be caused by intrahepatic choledocholithiasis, gallbladder stones, intrahepatic calcification, etc. If there are linear strong echoes on renal examination, it may be caused by intra-renal calcification, renal stones, etc. When linear echoes are found on examination, it is usually necessary for the treating doctor to make a comprehensive analysis and judgment to clarify the specific cause, and further examination is needed if necessary.