The bloodstain is not only the murder case scene trace, is also matter witness, and has the important crime evidence value and the appraisal function.

The analysis of bloodstain,the study of its rules and inner relations play important roles in confirming the characters of criminal cases and murderous weapons,analyzing the process of committing crimes,disclosing disguise at the scene,searching for alibi,and depicting suspects,affirming and denying suspects.

Purpose: To determine the cause of the vascular impression of horizontal part of duodenum of gastroentersinal tract barium meal examinatin.