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For this reason the authors noted that such low-dose techniques were most suited for assessment of children and possibly for screening patients at high risk for lung cancer. These recommendations have been implemented and further studied in lung cancer screening programs (Henschke et al. 1999; Itoh et al. 2000; Swensen et al. 2002) Similar dose-reduction strategies have been applied to high-resolution CT (HRCT) of the chest, where no significant difference in lung parenchymal structures was seen between low-dose (40 mAs) and high-dose (400 mAs) HRCT images (Zwirewich et al.

Patient radiation dose surveys have shown (Conway et al. 1992; Nishizawa et al. 1991; Panzer et al. 1989; Shrimpton and Edyvean 1998; Shrimpton et al. 1991a, 1991b) wide variations in radiation exposure between different sites and equipment. These CT data suggested that greater consideration needed to be given to the optimization chest CT exposures; however, the current data concerning CT radiation dose indicate that insufficient progress has been made. Several physical aspects of CT scanners result in wasted radiation dose; these include the shielding effect of the post patient collimator, imperfect collimation of the X-ray beam, and movement of the Xray focal spot.

18. 4 Pitch Limitations Fig. 19. 75-mm collimation. The ACV reconstruction of simulated CT data neglecting the cone angle of the measurement rays implemented in the 16-slice CT scanner SOMATOM Sensation 16 (Siemens, Forchheim, Germany). Modifications of the ACV approach providing cone correction, which are currently being investigated (Flohr et al. 2001; Bruder et al. 2001), will be reserved to future CT systems with more than 16 slices. 4 s to improve the temporal resolution in cardiac applications.

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BRS PATHO


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