Gabriel Helena, Shulman Lee, Marko Jamie, Nikolaidis Paul, Chirita Vica
Department of Radiology, Division of Ultrasound, Northwestern University, Feinberg School of Medicine, 676 N St Clair St, Suite 800, Chicago, IL 60611, USA.
J Ultrasound Med. 2007 Mar;26(3):355-9. doi: 10.7863/jum.2007.26.3.355.
The purpose of this study was to compare the use of fundamental versus compound sonographic imaging in the localization of nonpalpable subdermal contraceptive implants.
We describe 3 cases of subdermal implants for which detection was requested via sonography. The implants were evaluated with both fundamental and compound imaging with various transducers ranging from 5-2 to 15-7 MHz. The fundamental and compound images were compared with respect to echogenicity and, therefore, visibility, of the contraceptive implant and the appearance of posterior acoustic features.
Both fundamental and compound imaging visualized the focus representing the implant equally well. However, fundamental imaging proved superior to compound imaging for visualizing the posterior acoustic shadowing created by the implant. The posterior acoustic shadowing was the most helpful feature in the identification of these implant rods.
When attempting to image a subdermal contraceptive implant with sonography, fundamental imaging should be used. Compound imaging may mask the posterior acoustic features that can aid in implant identification.
本研究旨在比较基础超声成像与复合超声成像在不可触及的皮下避孕植入物定位中的应用。
我们描述了3例皮下植入物病例，这些病例要求通过超声进行检测。使用5-2至15-7MHz的各种换能器对植入物进行基础成像和复合成像评估。比较基础图像和复合图像中避孕植入物的回声性及可见性，以及后方声学特征的表现。
基础成像和复合成像对代表植入物的焦点显示效果同样良好。然而，在显示植入物产生的后方声影方面，基础成像优于复合成像。后方声影是识别这些植入棒最有用的特征。
当试图用超声对皮下避孕植入物进行成像时，应使用基础成像。复合成像可能会掩盖有助于识别植入物的后方声学特征。
