Cardiothoracic Imaging
Contents Anatomy Techniques Findings Cases References


Diagnostic imaging modalities - Radiographic gray scales


The range of densities that an X ray can display is the key to its usefulness as a diagnostic imaging tool. The X ray tube emits a large burst of X rays, generated by bombarding a tungsten target in a vacuum tube with high energy electrons (40 to 150 keV). Many of these X rays when directed toward a person will pass through the body and strike a fluorescent screen in a cassette, exposing a light-sensitive film adjacent to it.


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