For clinical purposes different slice widths must be available to adjust the optimum compromise between scan speed, transverse resolution and image noise for each application. With a single-slice CT detector, different collimated slice widths are obtained by prepatient collimation of the X-ray beam. A very elementary model of an M-slice CT detector consists of Mdetector rows: only for M = 2, however, can different slice widths be realized by pre-patient collimation. For M > 2 this simple design principle encounters its limitations. It has to be replaced by more flexible concepts requiring more than M detector rows to simultaneously acquire M slices
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