The GSL difference between shallow tumour and normal tissue by EEPC is larger than by WC,and the shallow tissue structures,gradation and interfaces were more clearer by EEPC than by WC.

• 结果 :用ee PC时浅表占位与正常组织对照点GSL差值增大 ,结构层次清晰 ,同时图像回声较低 ; 而用WC时则相反 ,后方回声增强 ,干扰大 ,图像模糊。