The potential of attenuation-based dynamic CT beam-shaping filter modulation as a new method for radiation dose reduction in MDCT: Evaluation by Monte-Carlo simulation of spatial…

Ziele: MDCT beam-shaping filters modulate X-ray beam intensity across the fan, compensating for decreasing absorption due to shorter X-ray path lengths through patient body periphery compared to its center. The effect of replacing static MDCT beam-shaping filter geometry by filter geometry dynamically adapted to elliptical specimen in dependence of projection angle has been evaluated with regard to its potential for radiation exposure reduction. Methode: Using a Compton spectrometer, primary MDCT X-ray spectra (120kVp) have been measured at different angular distance (0°-21°) from the central ray of the fan. The…