Summary
Results from a recent survey on MSCT practice in Germany indicate that 2-slice scanners (which are mainly former Elscint Twin scanners) are used at dose levels comparable with modern SSCT scanners, while dose values related with 4-slice scanner protocols are currently significantly, but not alarmingly, higher. The main reasons are: (1) reduced slice thickness, which tempts the users to increase the electrical current-time product in order to compensate for increased noise, (2) overbeaming due to penumbral effects, which are most pronounced at narrow slice collimation, and (3) reduced transparency of the implications of parameter settings on dose. The key factor to reduce dose at MSCT systems with N ≥ 4 to a level comparable to modern single-slice and dual-slice scanners is to appreciate the improved detail contrast achieved with thin slices due to reduced partial volume effect. This overcompensates for the drawback of increased noise. Thus, at least the same dose level as for modern SSCT scanners should be attainable. Furthermore, new technical means have the potential for dose reduction. It should be emphasized, however, that technical means are only a prerequisite, but no guarantee for dose reduction. Of greatest importance is appropriate training and guidance of the medical and technical staff operating the MSCT scanner with respect to the specific factors determining patient exposure and its reduction.
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References
ICRP (1991) Publication 60: 1990 Recommendations of the International Commission on Radiological Protection. Ann ICRP 21(1-3)
Council of the European Union (1997) Council directive 97/43/Euratom of 30 June 1997 on health protection against the dangers of ionizing radiation in relation to medical exposure, and repealing directive 84/466/Euratom. Document 397L0043. Official journal no. L 180, 09/07/1997, p 0022–0027
Nagel HD, Galanski M, Hidajat N, Maier W, Schmidt T (2002) Radiation exposure in computed tomography — fundamentals, influencing parameters, dose assessment, optimisation, scanner data, terminology. CTB Publications, Hamburg, ctb-publications@gmx.de
Brix G, Lechel U, Veit R, Truckenbrodt R, Stamm G, Coppenrath EM, Griebel J, Nagel HD (2004) Assessment of a theoretical formalism for dose estimation in CT: an anthropomorphic phantom study. Eur Radiol 14:1275–1284
European Commission (1999) Report EUR 16262 EN — European guidelines on quality criteria for computed tomography
ICRP (1996) Publication 73: Radiological protection and safety in medicine. Ann ICRP 26(2)
Galanski M, Nagel HD, Stamm G (2001) CT-Expositions praxis in der Bundesrepublik Deutschland — Ergebnisse einer bundesweiten Umfrage im Jahre 1999. Fortschr Röntgenstr 173:R1–R66
Brix G, Nagel HD, Stamm G, Veit R, Lechel G, Griebel J, Galanski M (2003) Radiation exposure in multi-slice versus single-slice spiral CT: results of a nationwide survey. Eur Radiol 13:1979–1991
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© 2006 Springer-Verlag Berlin Heidelberg
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Brix, G., Nagel, H. (2006). Dose Considerations and Radiation Protection Issues in Multislice CT. In: Bruening, R., Kuettner, A., Flohr, T. (eds) Protocols for Multislice CT. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-27273-9_3
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DOI: https://doi.org/10.1007/3-540-27273-9_3
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