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Figure 3a. Detector configurations and minimal voxel dimensions at multidetector CT with a matrix-array four-channel scanner. (a) Left: Diagram of beam geometry with a detector configuration of 4 x 1.25 mm. Four central elements are exposed, and four data components with a section thickness of 1.25 mm each are acquired per gantry rotation. Right: Diagram shows the reconstructed near-isotropic voxels, which on axial images have a z-axis depth of 1.25 mm, approximately twice the x- and y-axis dimension (0.7 mm). (b) Left: Diagram of beam geometry with a detector configuration of 4 x 2.5 mm. Eight central elements are exposed in pairs, and four data components with a section thickness of 2.5 mm each are acquired per gantry rotation. Right: Diagram shows the reconstructed voxels, which are four times as long in the z-axis as in the x- and y-axes. (c) Left: Diagram of beam geometry with a detector configuration of 4 x 3.75 mm. Twelve central elements are exposed in triplets, and four data components with a section thickness of 3.75 mm each are acquired per gantry rotation. Right: Diagram shows the reconstructed voxels, which are approximately six times as long in the z-axis as in the x- and y-axes. (d) Left: Diagram of beam geometry with a detector configuration of 4 x 5.0 mm. All 16 detector elements are exposed, and four data components with a section thickness of 5.0 mm each are acquired per gantry rotation. Right: Diagram shows the reconstructed voxels, which are eight times as long in the z-axis as in the x- and y-axes.
