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. Author manuscript; available in PMC: 2017 Jul 9.
Published in final edited form as: JACC Cardiovasc Interv. 2017 Jan 9;10(1):1–10. doi: 10.1016/j.jcin.2016.09.002

FIGURE 5. Proper Adjustment of 3-Dimensional Surface Rendering Display Level to Visualize Aortic Calcification as Seen From the Cava at Proposed Target.

FIGURE 5

(A) Setting an image level inappropriately low at 100 confuses exaggerates the extent of calcification. The image intensity histogram depicts that a majority of the pixels are above the 200 level (red line). (B) Appropriate image level of 300 discriminates vascular contrast (red) from aortic calcification (white) on the 3-dimensional surface rendering and on the histogram by evenly dividing the 2 populations of pixels. (C) An excessive image level of 500 results in artificially suppressing the appearance of calcium and will misleadingly depict a larger calcium-free target window. The corresponding histogram shows that most of the pixels are below the threshold level of 500 (red line). The proposed target appears as a yellow arrowhead or dot.