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Fig. 2B. —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 displaying same anatomy as A was created from source images with "bone" kernel. Because relatively higher image noise is present than that from standard algorithm, distinction between small attenuation differences is compromised. This problem is illustrated by observation that overall image appears grainy, tendons appear irregular, and muscles cannot be discerned as discrete structures.

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