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. Author manuscript; available in PMC: 2014 Mar 24.
Published in final edited form as: Int J Radiat Oncol Biol Phys. 2012 Oct 9;85(4):965–970. doi: 10.1016/j.ijrobp.2012.08.027

Fig 1.

Fig 1

Illustration of the BRA measurements.

BRA=(a1-b1)2+(a2-b2)2Referencelength(ref.)=b12+b22pBRA=(BRA/referencelength)×100

Illustration from Vreiling et al. (8) (copyright 1999 Elsevier Inc.).