An Investigation of the Slice Thickness of the Hitachi Head Scanner and Whole Body Scanner

Abstract

We discussed the slice thickness of pr 。 丘1e of two different machines which could be grouped into 180°t w 。 − slice scanner (head sc 註 nner) and 360D ・ne −slibe scanner (wh ・ 1e b ・dy scanne ・) ． The results as follows： 1． The slice thickness of 180°two ・ slice scanner was not same in the horizontal and the vertical plane 、 The slice thickness was thicker 1 ． 5ti 卑 es on the periphery than in the eenter and alsD thinner on the tube side than on the detector side ． The two slice profiles of 360°one − slice scanner were sym 皿 etric and the distri − bution of CT numbers was even ． The slice thickness was thicker ユ． 2times on the periphery than in the center ． 2． We investigated the infiuence of the ten kinds of weighting functiohs gn the slice thickness ， The close relationship between the s ！ ice thickness and weighting function was clearly demonstrated ． Thus ， it is necessary for us to measure slice thickness more precisely uti ［ izing重he raw data obtained from the cross −section of a phantom ． 1． 緒