i

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MR VCmean = [ MR VC (4C) + MR VC (2C) ] : 2

MR VC (4C): CD, Apical 4C view.
MR VC (2C): CD, Apical 2C view.


Example:
MR VC (4C) = 6 mm
MR VC (2C) = 10 mm
MR VCmean  = [(6 + 10)] : 2 = 8 mm