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. 2023 Dec 25;25(4):e14250. doi: 10.1002/acm2.14250

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© 2023 The Authors. Journal of Applied Clinical Medical Physics published by Wiley Periodicals LLC on behalf of American Association of Physicists in Medicine.

This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Linear regression analysis of the overlap‐based predictive parameter for rectum V_70Gy and rectum V_37.5 Gy with various patient cases for IMRT: (a) rectum V_70Gy against COPP, (b) rectum V_70Gy against POPP, (c) rectum V_37.5 Gy against COPP, and (d) rectum V_37.5 Gy against POPP. Data are plotted for three types of distances between PTV and rectum: far (circle), medium (triangle), and close (diamond), and for three types of volume: small (black), medium (gray), and large (white). The plot variations in markers of the same shape and same color indicate the result of varying bladder geometry. COPP, conventional overlap‐based predictive parameter; d, distance between rectum and PTV; IMRT, intensity modulated radiation therapy; POPP, proposed overlap‐based predictive parameter; PTV, planning target volume; RV, rectum volume.