title: Boundaries in the radiographic image. I. General principles for perception of boundaries and their application to the image.
abstract: Mechanisms underlying the perception of boundaries are discussed. The boundaries seen in the radiographic image are analysed and grouped in a limited number of types according to their information. Their perception, identification and evaluation are discussed. Possible sources of error are pointed out.
mesh_terms: D011856:Radiographic Image Enhancement; D013679:Technology, Radiologic; D014796:Visual Perception; D014962:X-Ray Film