低線量放射線治療が眼循環に与える影響

Effect of low-dose radiation on ocular circulation

（B6-2-14）　超音波カラードップラー法を用いて，加齢黄斑変性症の脈絡膜新生血管に対する低線量放射線治療前後で，治療眼および僚眼の短後毛様動脈，網膜中心動脈および眼動脈の時間平均血流速度（Vmean）と血管抵抗指数〔resistive index （RI）〕を解析した。低線量放射線の後極部照射前と照射後では，これらの動脈のVmeanとRIに統計学的有意差はなかった。したがって，低線量放射線照射の眼循環に対する明らかな影響はない。

We treated 6 eyes of unilateral age-related macular degeneration by low-dose radiation. Each eye received daily dose of 2 Gy by 4MV lineac totalling 20 Gy over 2 weeks. Color doppler flowmetry was used to determine the mean blood flow velocity (Vmean) and vascular resistive index (RI) in the short posterior ciliary artery, central retinal artery and ophthalmic artery in the treated and fellow eyes before and up to 6 months of treatment. There were no significant differences in Vmean and RI before and after treatment. The findings show the absence of apparent influence of low-dose radiation on the ocular circulation in age-related macular degeneration.