造影检查的目的是（）The purpose of angiography is（）

A.增加器官或组织的自然密度Increase the natural density of tissues or organs

B.增加器官组织的自然对比度Increase the natural contrast of tissues and organs

C.降低器官组织的自然密度Decrease the natural density of tissues or organs

D.增加器官组织的人工对比度Decrease the natural contrast of tissues and organs

正确答案：增加器官组织的人工对比度Decrease the natural contrast of tissues and organs