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66Chapter3ThevectorbdefinesasetofparametersdescribingthecranialshapeofapatientCranialmorphologycanbechangedbyvaryingtheelementsofbThePCAmodelofthecontrolpopulationwasusedtodeterminetheparametersforthescaphocephalyandtrigonocephalypatientsForeverypatienttheparametersbwerecalculatedusingXpatientwasamodified3Dphotographofapatient(scaphocephalyortrigonocephaly) Thevarianceoftheeveryparameter,bi
acrossthecontroldatasetwasgivenbyλcontrol,iTheparametersofthecontrolsandthepatientswereexpressedasstandarddeviations(SD)fromthemeancranialshapebyTheparametersexpressedinSD’softhecontrolswerecomparedtothescaphocephalyandtrigonocephalypatients
