Logarithmic amplificationを用いた最新の超音波診断装置TRISCANによる眼内膜様病変のtissue characterizationについて

Ultrasonic tissue differentiation of membrane-like lesions in the vitreous using logarithmic amplification of TRISCAN

　眼科領域における最新の超音波診断装置TRISCANを用い眼内膜様病変の検索を行った。TRISCANは附属のカリパー装置によりBモードで組織間の距離や大きさをmm単位でデジタル表示でき，topographic echographyにきわめて有用であった。また本装置に用いられているAモードのS-curved amplificationとIogarithmic amplificationによるquantitative echographyを行い，その結果，S-curved amplificationよりもdynamicrangeが40dBおよび25dBのlogarithmic amplificationによる鑑別診断の方がより有用であることがわかった。

Prior to vitreous surgery, it is necessary to obtain precise information on membrane-like structures in the vitreous. For this purpose we studied mem-brane-like structures in the vitreous with a recently developed ultrasonic equipment, TRISCAN, which incorporated on the S-curved and logarithmic am-plification.

In topographic echography, TRISCAN with an electric caliper was superior in providing the dis-tancc between tissues or the size of lesions with the precision of 0.1 mm on the digital display.