Journal of Okayama Medical Association
Published by Okayama Medical Association

<Availability>
Full-text articles are available 3 years after publication.

超音波連続波照射の安全性に関する研究

Kawai, Junichirou
104_539.pdf 1.93 MB
Abstract
Rat fetuses were extra-abdominaly exposed to 2 MHz continuous wave ultrasound, with 1.5 or 2.5W/c㎡ of spatial average (SATA) intensity, for 15 min at 7.5 to 11.5 days of pregnancy. Fetal anomalies were observed only in the groups exposed to 2.5 and 1.5W/c㎡ at 9.5 days of pregnancy but its occurrence was not statistically significant. Intrauterine fetal deaths were most prevalent in the group exposed to 2.5W/c㎡ at 9.5 days of pregnancy, followed by the group exposed to 2.5W/cm2 at 10.5 and 7.5 days of pregnancy. At three months after birth, the behavior (open field test), the learning ability (avoiding study and single straight pathway test) and the fertility of these exposed rats were compared with those in non-exposed rats. In the avoiding study, there was statistically less avoidability in the group exposed to 2.5W/c㎡ at 9.5 days of pregnancy than the non-exposed group. In the other tests, no significant differences could be found between the exposed group and non-exposed group. These findings indicated that rat fetuses at 9.5 days of pregnancy are most senstive to continuous wave ultrasound exposure followed by fetuses at 10.5 or 7.5 days of pregnancy.
Keywords
超音波連続波照射
生物学的効果
胎仔奇形
学習試験
ISSN
0030-1558
NCID
AN00032489