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Table 1 Notation

From: Research on a bifurcation location algorithm of a drainage tube based on 3D medical images

M1(x1, y1, z1), M2(x2, y2, z2)The coordinate of the joint point of the optimal external axis and the boundary of the hematoma
d12 =  M1M2The distance from M1 to M2
d34 =  M3M4The maximum diameter of the vertical surface through M1/2 in the hematoma
M3(x3, y3, z3), M4(x4, y4, z4)The coordinates of the endpoints of d34 in the hematoma
D, dDdenotes the diameter of the duct in the main tube; d denotes the diameter of the hole in the subtube
dOThe distance between the two central points of the holes
dBThe distance between the two bifurcations
\( {d}_{B_i} \)The distance between the main probe tip and the i − th bifurcation-tube probe tip (we define the first subtube to be nearest to the main probe tip)
  1. Note: Only some common symbols are listed here; the rest are explained later