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Table 5 BD results after CBCT-based setup correction (115 CT/CBCT pairs of 10 patients). Before registration, air was replaced by soft tissue in images.

From: Development of CBCT-based prostate setup correction strategies and impact of rectal distension

  Without RR Manual-contour RR Global RR Bony RR Local RR
   (reference)    1 mm 3 mm 5 mm 8 mm 10 mm 12 mm 15 mm 20 mm
BD* median (mm) 2.86 1.48 2.09 2.17 2.23 2.24 1.89 1.91 1.89 1.97 2.00 1.95
BD* SD (mm) 1.18 0.32 0.64 0.71 1.90 1.69 1.08 0.49 0.59 0.55 0.61 0.66
  1. *BD stands for Bidirectional Distance. It was calculed for each contour comparison by averaging the BLD values over the reference contour.