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(a) Horizontal line profiles extracted from a patient DRR image at gantry angle 140°. (b) The intensity values of one of the extracted profiles. The CW is located at the peak pixel value that is found in the search window (red). (c) The resulting CW delineation (red) with MLC (blue) and jaw (light blue) positions superimposed. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
