简介：Traditionally,bonestructureandbonemassareassessedbyobservingtherari-fiedboneonstandardx-rayfilms.However,smallchangesinbonemasscannotbedetectedeffectively.Bythetimelossofbonemasscanbedetectedonthex-ray,thediseaseisalreadyinanadvancestage.Atleast30%ofbonemustbelostbeforeproblemslikeosteoporosiscanbediagnosed.
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