Kinect-Based Correction of Overexposure Artifacts in Knee Imaging with C-Arm CT Systems

Figure 11

(a) shows a slice of the uncorrected volume. Severe artifacts deriving from saturation are visible on the right exterior regions of both bottles. (b) shows the corresponding slice to (a) which has been reconstructed by solely using the intersection lengths obtained from the depth data. These values are used for the correction of the saturation artifacts. A slice of the resulting corrected volume can be seen in (c). (d) shows the reconstruction of the nonoverexposed knee phantoms. The bone phantoms have been removed to acquire this ground truth reference. For further demonstration of the results, the absolute difference between the ground truth and the uncorrected data (e) and the corrected data (f) is visualized. The two dense rods between the two water cylinders have a density of 1000 g/cm², simulating the femurs in the legs. Window level (a)–(d): [−1000, 1000]. Window level (e) and (f): [0, 1000].

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