虽然区域构造与火山岩的复合发育区的基本轮廓可被识别，但陡倾角地层的反射成像不清晰，火山岩地层边界模糊。
Though it is roughly recognizable for the outlines of regional structure and volcanic rocks, the images of steep dip strata and boundary of volcanic rock are smeared.
结果超声内镜下胰头癌主要表现为边界不清晰（22/32）的低回声（21/32），伴有胆总管和胰管的扩张（19/36）、血管的侵犯（26/32）；
The tumor displayed the character of low echo (21/32), obscure boundary(22/32), vascular invasion (26/32), pancreatic duct and common bile duct dilation (19/36).
但由于目前在MAP算法中普遍采用的是平滑型图像先验模型，导致重构出来的图像边界不明锐，一些细节不清晰。
However, due to the use of smooth prior image model in MAP, the reconstructed edges and some image details are blurred.
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