|
此文章由 whuang 原创或转贴,不代表本站立场和观点,版权归 oursteps.com.au 和作者 whuang 所有!转贴必须注明作者、出处和本声明,并保持内容完整
Studies have shown ultrasound has no harmful effects to you or your baby. Ultrasound scan uses high frequency sound waves, inaudible to the human ear, that are transmitted through a transducer. The echoes are recorded and transformed into video or photographic images of your baby. Ultrasound is not radiation like X-ray.
The sound waves are transmitted from transducer in only fraction of the scanning time, in the rest of the time, the transducer receives the echo. There is presently no evidence of a cumulative effect of ultrasound (multiple scan) in the fetus.
By the way, the handheld doppler mechine (use to listen to the foetal heart rate) also transmit ultrasound waves. |
|