Papers Published

1. Dobbins, J.T., III and Powell, A.O., Variable compensation technique for digital radiography of the chest, Radiology (USA), vol. 173 no. 2 (1989), pp. 451 - 8 .
   (last updated on 2007/04/15)

   Abstract:
   Describes a new technique, variable compensation (VC) radiography, for digital radiography of the chest. It permits retrospective adjustment of image display while maintaining improved mediastinal signal-to-noise ratio (S/N) from aggressive X-ray equalization. A fraction of a logarithmic image representing the profile of the beam intensity incident on the patient is subtracted from a logarithmic equalized image. VC images of a chest phantom were generated with various weightings of the beam-profile image. Edge artifacts were substantially reduced with a weighting of greater than 0.5 and eliminated with a weighting of 1.0. The S/N properties of VC images were measured with a series of plastic squares placed over various regions of the chest phantom. The S/N of the squares in the dense subdiaphragm were improved twofold compared with the S/N on unequalized radiographs, whereas the S/N in the lung was reduced by 30%

   Keywords:
   diagnostic radiography;