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The structure contour is shown here in yellow. The DVH, based on pixels, said it was covered by 100% dose. But the 100% dose line does not cover it. It is only completely covered by a 25% dose line, a very large discrepancy. What if the DVH were based on dose points? Unless we interpolate in creating the DVH, the result would not change. All points inside the contour are still 100%. However, since we interpolated the dose lines, the same could be done for the DVH.