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. Author manuscript; available in PMC: 2008 Dec 1.
Published in final edited form as: Int J Radiat Oncol Biol Phys. 2007 Dec 1;69(5):1572–1578. doi: 10.1016/j.ijrobp.2007.08.011

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Sketch illustrating the determination of Mean Central Dose, MCD, as used in RTOG protocol 95-17. The centroids of the triangles formed by adjacent seed trains (catheters) correspond to the centers of the regions of low dose and low dose gradient between the seed trains, called Geometric Center Dose, GCD. The MCD was defined in the central plane of the implant and is the mean of the GCDs.