憩室表现为胰头右后方半圆形含气体腔影，可有液平，与胰头交界部边缘锐利。
Duodenal diverticulum manifested as hemicycle lesion with gaseous density which had air-fluid level behind pancreatic head with clear border.
导管内的肿瘤上皮细胞表现为淡染和多型现象，但是他们有边缘锐利的孔像被切饼机切过一样。
The neoplastic epithelial cells within the duct show minimal hyperchromatism and pleomorphism, but they have holes with sharp margins as though punched out by a cookie cutter.
实现这种效果具代表性地是采用固定、圆形的准直器，它能够产生边缘锐利、高适形的治疗射束。
This is typically achieved using fixed, circular collimators that produce sharp-edged, highly conformal treatment beams.
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