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超声作为诊断工具广泛应用于几乎所有医学领域已有25年,由于超声临床效果好、方便、无创,美国一半以上妊娠妇女均经超声检查。由于此种技术主要用来检测胎儿,因而其安全性问题十分重要。此前有研究报告提出超声可致染色体畸变及姐妹染色体交换增加,但其他研究者未发现类似结果。在美国及其它发达国家,许多民间及政府的研究机构对超声的安全性问题进行了大量研究,均未证实超声对人体有害。高能超声通过热作用及空穴作用(cavitational acti v ities)确能产生一定的生物学效应,在通常进行的超声检查中,温度升高在1℃以内,而在成人及胎儿,一天的体
Ultrasound as a diagnostic tool has been widely used in almost all medical fields for 25 years. Because of the clinical effect of ultrasound, convenient and noninvasive, more than half of the pregnant women in the United States have been ultrasonographed. Because of this technology is mainly used to detect the fetus, so its security issues are very important. Previous studies have suggested that ultrasound can cause chromosomal aberrations and sister chromosome exchange increased, but other researchers did not find similar results. In the United States and other developed countries, many civil and government research institutes have conducted extensive studies on the safety of ultrasound and have not confirmed that ultrasound is harmful to humans. High-energy ultrasound does produce some biological effects through thermal and cavitational acti vies, with a temperature increase of less than 1 ° C in the usual sonographic examination, whereas in adults and fetuses, one-day body