Cardiothoracic Imaging
Contents Anatomy Techniques Findings Cases References


Formation of film radiographic images


X-ray imaging is a method of illuminating the body with a penetrating high energy ionizing radiation. The differential absorption of this radiation by the various tissues of the body creates on film an inverse shadow of the body. Less dense, lower atomic weight structures, such as the lung, allow transmission of more radiation flux producing greater fluorescence on an absorbing screen which exposes an adjacent film more densely, making those areas black. Higher atomic weight structures (bone) absorb and block the radiation, thus do not result in the exposure of the silver halide grains in the film emulsion, and so bony structures such as the ribs appear white (transparent).


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Copyright 2004, Yale University School of Medicine. All rights reserved.
December 18, 2004 (PL)
version b.003