Proceedings Paper2-Dimensional Primary X-Ray Image Formation And Quality In Angiography Using Absorption-Edge Filters In The Range 40-60 Kev
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Computer simulation techniques are used to examine Pr, Gd and Yb (K-edge) filters for the x-ray imaging of iodinated blood vessels. The performance of these filters is compared to a standard 2 mm Al filter with respect to vessel contrast, patient exposure and integral absorbed dose and x-ray tube loading. Additional simulations investigate how 0.2 mm Pr, Gd or Yb filters interact with the non-isotropic x-ray spectrum and affect the background intensity and vessel contrast across the detector surface, and the uniformity of exposure and integral absorbed dose across the patient. The results show that the uniformity of the primary x-ray image is neither degraded nor improved by these filters; however, patient exposure and dose can be substantially reduced and rendered more uniform.