4.3　Computed Tomography（CT）

In current practice，CT scan abdomen is often the initial investigation when CP is suspected.CT is the most sensitive and specific modality for depicting pancreatic calcifications，which may be tiny and punctate or larger and coarse（Muniraj et al.2015）.However，the early changes associated with chronic pancreatitis are more difficult to identify on CT.Characteristic findings on CT include dilatation of the pancreatic.(https://www.daowen.com)

Optimal evaluation of the pancreas requires helical CT scanning using a pancreas-optimized protocol.This technology permits scanning of the complete pancreas during a single breath hold.Whenever possible，an oral contrast agent should be used to maximize pancreatic visualization and especially the duodenal wall，the papilla，and the duodenal pancreatic boundaries.Table7.3 provides the typical imaging parameters that we employ.