Contrast Sensitivity Of Digital Fluorographic Systems

S. J. Riederer; A. L. Hall; G. S. Keyes; N. J. Pelc

doi:10.1117/12.934496

1 November 1982 Contrast Sensitivity Of Digital Fluorographic Systems

S. J. Riederer, A. L. Hall, G. S. Keyes, N. J. Pelc

Proceedings Volume 0372, Physics and Engineering in Medical Imaging; (1982) https://doi.org/10.1117/12.934496
Event: International Workshop on Physics and Engineering in Medical Imaging, 1982, Pacific Grove, United States

Abstract

Several aspects of iodine sensitivity of digital fluorographic systems are discussed as applied to digital subtraction angiography. Expected iodine signal magnitudes are reviewed and shown to be in the range of 1-10 mg/cm². An experimental example of spurious contrast in iodine sensitivity measurements is2 provided. Imaging of a 1 mm wide 0.25 mg/cm simulated iodinated vessel is demonstrated. Such iodine amounts are thought to be near the limit of the sensitivity of digital fluorographic systems. The concept of matched filtering is proposed for generating the equivalent of temporal subtraction images but using low intensity continuous x-ray exposures. The first experimental matched filter canine image is presented using a total exposure for the procedure about one-sixth of that used for pulsed exposure images of comparable quality.

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S. J. Riederer, A. L. Hall, G. S. Keyes, and N. J. Pelc "Contrast Sensitivity Of Digital Fluorographic Systems", Proc. SPIE 0372, Physics and Engineering in Medical Imaging, (1 November 1982); https://doi.org/10.1117/12.934496

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