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Figure 4b.   Cross-sectional profile of an unequal-width detector design. (a) To acquire four 5-mm-thick sections, all eight detectors are activated. The signals from the detectors are combined into four channels, each representing a 5-mm-thick virtual detector. (b) To acquire four 2.5-mm-thick sections, the inner six detectors are activated. (c) To acquire four 1-mm-thick sections, pre- and postpatient collimators cover the outer one-third of the 1.5-mm-wide detectors. (d) Two 0.5-mm-thick sections can be created with narrower collimation.