Jacobson J A, Powell A, Craig J G, Bouffard J A, van Holsbeeck M T
Department of Radiology, Henry Ford Hospital, Detroit, MI 48202, USA.
Radiology. 1998 Jan;206(1):45-8. doi: 10.1148/radiology.206.1.9423650.
To evaluate the use of ultrasound (US) for detection of wooden foreign bodies implanted in cadaveric specimens.
Wooden foreign bodies were randomly placed in the plantar soft tissues of three cadaver feet by using 5-mm-long incisions. Ten foreign bodies were 2.5 x 1.0 mm (length x diameter); 10 were 5.0 x 1.0 mm. Ten incisions were performed without implantation of foreign bodies. Three musculoskeletal radiologists independently performed US in blinded fashion and recorded the presence of a foreign body. Each used 7.5- and 10-MHz linear-array transducers and was informed of the possible presence of a foreign body.
Sensitivity and specificity for detection of 2.5-mm-long foreign bodies were 86.7% and 96.7%, respectively. Sensitivity and specificity for detection of 5.0-mm-long foreign bodies were 93.3% and 96.7%, respectively. Overall sensitivity was 90.0%, with specificity of 96.7%, accuracy of 92.3%, positive predictive value of 98.0%, and negative predictive value of 83.0%.
US can be used effectively to locate wooden foreign bodies as small as 2.5 mm in length. Given that many foreign bodies are radiographically undetectable, the accuracy and availability of US make it an excellent modality for evaluation of radiolucent foreign bodies.
评估超声（US）用于检测植入尸体标本中的木质异物的效果。
通过5毫米长的切口将木质异物随机放置在三只尸体足部的足底软组织中。10个异物长2.5×1.0毫米（长×直径）；10个长5.0×1.0毫米。进行10次切口但不植入异物。三名肌肉骨骼放射科医生以盲法独立进行超声检查并记录异物的存在情况。每人使用7.5兆赫和10兆赫的线性阵列换能器，并被告知可能存在异物。
检测2.5毫米长异物的灵敏度和特异度分别为86.7%和96.7%。检测5.0毫米长异物的灵敏度和特异度分别为93.3%和96.7%。总体灵敏度为90.0%，特异度为96.7%，准确度为92.3%，阳性预测值为98.0%，阴性预测值为83.0%。
超声可有效用于定位长度小至2.5毫米的木质异物。鉴于许多异物在X线片上无法检测到，超声的准确性和可用性使其成为评估透射线异物的极佳方式。
