Scanning parameters.
The use of multi-detector scanners (16 and 64 slices) has resulted in thinner slice thickness (collimation) and still a faster examination (less than 15 seconds). Using a thinner slice collimation should improve the accuracy of the technique.
As a screening procedure should be harmless, the radiation dose generated by computed tomography cold be a blocking issue when screening a population at average risk for colorectal cancer. However since the introduction of the multi-row detector scanners efforts to reduce the radiation dose have been performed. In fact Iannaccone et al. obtained a sensitivity of % and % for lesions 6-9 mm and > 1 cm respectively, using an ultra-low dose of 140 kV and 10 mAs. With the new 64-slice scanners the identical ultra-low dose can be used without deterioration of the image quality.
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