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Visual verification for supine-prone registration. After registration, a polyp found on the flattened supine surface (yellow circle in (b)) can be located on the flattened prone surface (yellow circle in (c)) at nearly the same position. (b) and (c) are the flattened views of the ascending segments of the supine and the prone, respectively. (a) and (d) are zoom in to the neighborhoods of the same polyp on the supine and the prone, respectively.
