Najarian K E, Kurtz A B
J Ultrasound Med. 1986 Apr;5(4):205-10. doi: 10.7863/jum.1986.5.4.205.
The in vitro sonographic appearance of the four currently available intrauterine contraceptive devices (IUDs) now used in the United States and Canada were analyzed and compared with in vivo scans. While plastic IUD limbs demonstrated entrance-exit echoes in all scan planes, copper IUDs showed posterior reverberation when optimal gain settings were used. Regardless of the transducer used, posterior acoustic shadowing was only seen when IUD limbs were scanned perpendicular to their long axis and at the junction of long and short limbs. The authors feel that these refined ultrasound characteristics will be helpful in accurately identifying IUDs within the uterus.
对目前在美国和加拿大使用的四种宫内节育器（IUD）的体外超声表现进行了分析，并与体内扫描结果进行了比较。虽然塑料IUD臂在所有扫描平面上均显示出入射-出射回声，但在使用最佳增益设置时，铜IUD显示出后方混响。无论使用何种换能器，仅当IUD臂垂直于其长轴且在长短臂交界处进行扫描时，才会出现后方声影。作者认为，这些精确的超声特征将有助于在子宫内准确识别IUD。
