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. Author manuscript; available in PMC: 2017 Nov 14.
Published in final edited form as: Int J Radiat Oncol Biol Phys. 2016 Dec 21;97(5):894–902. doi: 10.1016/j.ijrobp.2016.12.021

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A) M1- is the ratio of the difference between the vertical positions (Y) of each nipple (N) to the difference between the horizontal positions (X) of each nipple. Larger values near 1 indicate symmetry while smaller values near 0 indicate asymmetry. B) Formula for M1 calculation. C) M2 is a function of the ratio of the vertical displacements of the nipple centroids (N) from the level of the lowest visible point of the breast (V). M2 is bound between 0 and 1. Larger values near 1 indicate symmetry while smaller values near 0 indicate asymmetry. D) Formula for M2 calculation. E) M3 is a function of the ratio of the horizontal displacements of the nipple centroids (N) from midline. M3 is bound between 0 and 1. Larger values near 1 indicate symmetry while smaller values near 0 indicate asymmetry. F) Formula for M3 calculation. G) M4 is a function of the ratio of the horizontal displacements of the nipple centroids (N) from the lateral extent of the breast (L). M4 is bound between 0 and 1. Larger values near 1 indicate symmetry while smaller values near 0 indicate asymmetry. H) Formula for M4 calculation. I) M5 is a function of the ratio of the vertical displacements of the lowest visible points of the breast (V) from the level of sternal notch (S). M5 is bound between 0 and 1. Larger values near 1 indicate symmetry while smaller values near 0 indicate asymmetry. J) Formula for M5 calculation. K) M6 is a function of the ratio of the horizontal displacements of the lateral extents of the breast (L) from the midline. M6 is bound between 0 and 1. Larger values near 1 indicate symmetry while smaller values near 0 indicate asymmetry. L) Formula for M6 calculation.