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Effect of multislice scanners on patient dose from routine CT examinations in East Anglia

East Anglian Regional Radiation Protection Service, Addenbrooke's Hospital, Hills Road, Cambridge CB2 2QQ, UK

View larger version (38K): [in a new window]   Figure 1. Beam collimation in single-slice and multislice CT. (a) In a well-collimated single-slice system, a 5 mm slice width is achieved by irradiating approximately 5 mm of the single 10 mm wide detector. (b) In a multislice system used to acquire four 1.25 mm slices, the shape of the beam profile means that more than 5 mm of the detector must be irradiated in order to ensure that the four detectors are irradiated to uniform intensity.

View larger version (52K): [in a new window]   Figure 2. Mean effective doses for each scanner, for each examination category. Scanners are anonymously identified by the letters A to L, according to the order in which they appear in Figure 3. Varying numbers of scanners contributed data to the different examination categories. Error bars represent the standard error of each mean.

View larger version (45K): [in a new window]   Figure 3. Mean relative effective doses (averaged across all examinations) for each scanner in the 2002 audit. Error bars represent the standard error of each mean.