QCT骨密度测量的准确性试验方法和意义李大成.pdf

2003 8 9 3 Chin J Ost oporos, August2003 Vol 9, No3 217 QCT 李大成 姜维平 黎本丰 罗刚 周维彬 尚家芸 鄢青 QCT( CT ) , QCT CT ( ) , QCT ( ) , 15 cm , 234 , QCT , QCT QCT 3 50 mg/ 3 3 3 cm 100mg/ cm 200 mg/ cm , % , 3 , , 3 - 130% -526% + 385% , 0963, r = 0998, Y= 12075+ 0907X ( X , Y ) CT , , 3 -3054% -997% -001% , Y= 1843+ 0910X ( 30% ) , , , QCT , , QCT , QCT ; ; ; Methods and significance of accuracy fest of bone densitometry by QCT LI Dacheng , JIAN G Weip ing , LI Benf eng , et alJianyang Peop le s H osp ital, Jianyang 641400, China Abstract Obj ective Th corr ction of accuracy rrors in bon d sitom try by QCT has not b n carri d out y t at pr s nt in ChinaThis articl introduc s th m thods of QCT accuracy t st and th r asons of accuracy rror corr ction Methods A r f r ntial bon phantom ( nam d Toshiba phantom) with softwar contain d in a Toshiba CT machin was us d as m asuring tools to m asur th BMD of th QCT bon phantom mad by W s-t China Ost oporosis Study C nt r of Sichuan Univ rsity( nam d Sichuan phantom) Th Sichuan phantom( mimicking human v rt bra ) was put in a wat r bath 15cm d p whil th Toshiba phantom was plac d b tw n th wat r bath and th scan tabl as a r f r ntial crit rionTh n th machin was op rat d according to th m asuring conditions of scanning human lumbar v rt bra 2, 3, 4 and th m thods of Toshiba QCT d nsitom try until it m asur d out BMD valu s and obtaih d QCT imag sB caus th r al d nsiti s of th thr s ctions of hydroxyapatit in Sichuan QCT 3 3 3 phantom ar 50mg/ cm , 100mg/ cm , and 200mg/ cm , r sp ctiv ly, th m asur d valu of ach s ction s d viating from its r al valu can b calculat d, and th accuracy rror in pr c ntag is acquir dTh m asur d valu larg r than th r al on is po