Abstract
·AIM ：T0 measure the anatomical character of nasolacrimaIdust by spiral CT 3D rec0nstruCtiOn in children．
·METHODS：The Jength of nasolacrimaI dust and theangles between nasolacrimal dust and verticaI plaDe．
horizontaI plane and coronal plane in 27 chiIdrenf54 eyes)and 15 adults(30 eyes)were surveyed using spiral CT 3D
rec0nstructiOn．W hile the Iength of nasolacrimal dust in 7dead children(14 eyes)body were surveyed as comparison
by anatomicaf method． The resuIts were analyzed bysoftware SPSS 13．0 statisticalIY．
·RESULTS：The length of nasolacrimaI dust was 10．06±0．29m m in ch_Idren and 11．51±1．54m m in adults by spiralCT 3D rec0nstructj0n．as 9．95．i-0．31 m m in dead childrenbody by anatomical m ethod，with significant statisticaldiference between that of children and adults．The anglesbetween nasolacrimal dust and vertical plane．horizontalplane and coronal plane in children were 7．96。±1．62。．73．24。±6．75。．and 12．31。±2．03。respectively．wh_le thecOrrespOnding angels in adults were 8．08。4-0．63。，72．69。±
3．85。and 12．09。4-1．21。．The di仟erence between themhad no statisticaI meaning．

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