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Fig. 2A. —Single helical CT acquisition (with 1-mm collimation, 12-cm field of view, 0.5-mm reconstruction interval) of 23-year-old man imaged to characterize fracture at base of second metacarpal (not shown). Three-dimensional image was created from source images with "standard" kernel. Note that tendons (T) appear as smooth continuous structures, that muscles in hypothenar eminence (M) are visible but rendered relatively transparent, and that bone is opaque.