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78Chapter4ThemainpurposeofOCVRistoincreasetheintracranialvolume Theintracranialvolumeofavirtualreconstructioncanbecalculatedandcomparedwiththecurrentsituationand withreferencemeasurements from theliteratureInadditiontheshapeofapatientcanbecomparedtoanaverageskullcomposedofasetofCTscansofage-correlatedchildrenwithnoskullabnormalityThismakesitpossibletocreateatransparent3DoverlayduringtheplanningwhichservesasastartingpointThemorphologyofthepatient’scraniumitselfcanalsobeusedasareferenceduringplanningInFigure4theunaffectedsideofaplagiocephalypatienthelpstodeterminethenewpositionoftheaffectedsidebymirroringandusingthisprojectionontherightsideasavirtualtemplateThistemplatedirectshowtherightorbitalbarneedstobemanipulatedandadvancedtorestoresymmetryFigure4TopviewofaplagiocephalypatientTherightretractedorbit(blue)canbecomparedtotheunaffectedleftsideTheleftsideismirroredandusedasavirtualtemplatefortherightside(green)torestoresymmetry
