Iodine sensitivity of digital imaging systems

S. J. Riederer, B. F. Belanger, G. S. Keyes, N. J. Pelc

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


One of the most successful applications of digital radiography systems thusfar has been the imaging of vasculature opacified by intravenously administered contrast agents using temporal subtraction. Because the contrast in the arterial structures of interest is small as a consequence of the dilution due to the intravenous injection, it is essential that such imaging systems have high contrast sensitivity. This paper discusses means to assess the contrast sensitivity of imaging systems using iodinated phantoms and temporal subtraction. A difference image is shown demonstrating a 1 mm vessel containing 0.5 mg/cm2 of iodine, i.e. less than 1% radiographic contrast. Initial CDD results are presented. Dependence of CDD analysis on video signal level is demonstrated. The effects of x-ray scatter and image intensifier veiling glare are predicted and measured experimentally. Contrast levels in two digital fluorographic clinical procedures are estimated.

Original languageEnglish (US)
Pages (from-to)132-139
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - Nov 4 1981

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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