A METHOD FOR CLASSIFYING X-RAY FILM

Abstract

A study has been conducted to evaluate the parameters that could be used to characterize X-ray film. Factors such as speed, graininess, resolution, contrast and uniformity of emulsion are discussed. Recently developed methods of measuring resolution such as the modulation transfer function will be reviewed. At the present time it is felt that the characteristics of speed and average gradient should form the basis of a film classification system. It is proposed that a contrast-speed index equal to G times the square root of r be used to characterize X-ray film. G is defined as the average gradient between two arbitrary densities d1 and d2, and r is the number of roentgens necessary to produce the density midway between d1 and d2.

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Document Details

Document Type
Technical Report
Publication Date
Mar 12, 1968
Accession Number
AD0668697

Entities

People

  • Daniel Polansky
  • Edward L. Criscuolo

Organizations

  • Naval Ordnance Laboratory

Tags

Communities of Interest

  • Biomedical
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Automatic
  • Chemistry
  • Classification
  • Emulsions
  • Measurement
  • Munitions
  • Navy
  • Ordnance Laboratories
  • Photographic Emulsions
  • Photographic Materials
  • Photography
  • Radiation
  • Test Methods
  • Transfer Functions
  • United States
  • X Ray Film
  • X Rays

Fields of Study

  • Physics

Readers

  • Approximation Theory.
  • Image Processing and Computer Vision.
  • Nuclear and Radiation Engineering.