Composition of intraocular foreign bodies: experimental study of ultrasonographic presentation.
Composition of intraocular foreign bodies: experimental study of ultrasonographic presentation.
复制标题
眼内异物的成分：超声表现的实验研究。
DOI：
10.1590/s0004-27492013000100005
复制
发表时间：
2013
影响因子：
1
通讯作者：
N. Allemann
中科院分区：
文献类型：
--
作者：
Márcio Augusto Nogueira Costa;Patricia Novita Garcia;L. Barroso;Marco Antônio Ferreira;É. Okuda;N. Allemann
目的
探讨超声确定不同材料眼内异物大小的可靠性，并识别其超声特征和伪影。
方法
使用 36 只摘除猪眼的实验研究。将九种不同成分（木材、玻璃、塑料、纸板、铁、铝、铅、粉末和混凝土）和相似尺寸（4毫米）的碎片通过巩膜切口植入到36只猪眼的玻璃体腔中，每种材料使用四只眼睛。使用接触技术、导电凝胶和 10 MHz 换能器（EZScan，Sonomed）对所有眼睛进行超声检查。
结果
考虑到火药、铅、混凝土、铝、木材和玻璃等材料碎片，超声波确定的尺寸在统计上被认为与实际尺寸相似。铁材料的超声波测定尺寸在统计上小于其实际尺寸。纸板和塑料材料显示超声波测定的测量值远远大于实际值。所有眼内异物碎片均表现出高反射界面，无论其成分如何。针对不同材料产生的伪影，发现铁、铝、铅材料表现出较大程度的混响。木材材料没有表现出混响。与其他材料相比，铁、玻璃、铝和纸板材料的混响伪影长度较短。除铝外，所有材料均呈现后部阴影伪影。
结论
超声检查被认为是确定猪眼内异物大小的可靠技术，其成分造成的影响很小。产生的超声伪影被认为与材料有关，可以帮助检查者识别未知病因异物的性质。超声检查帮助外科医生识别、定位和测量眼内异物，指导适当的手术计划。
PURPOSE
To investigate the reliability of ultrasound in determining the size and identify the sonographic features and artifacts generated by intraocular foreign bodies of different materials.
METHODS
Experimental study using 36 enucleated porcine eyes. Fragments of nine different compositions (wood, glass, plastic, cardboard, iron, aluminum, lead, powder and concrete) and similar dimensions (4 mm) were implanted via scleral incision into the vitreous cavity of 36 porcine eyes, four eyes were used for each material. Ultrasound examination was performed in all eyes using the contact technique, conductive gel and 10-MHz transducer (EZScan, Sonomed).
RESULTS
Considering the material fragments of gunpowder, lead, concrete, aluminum, wood and glass, the size determined by ultrasound was considered statistically similar to the actual size. The material iron presented ultrasound-determined dimension statistically smaller than its actual size. Cardboard and plastic materials showed ultrasound-determined measurements far greater than the actual. All fragments of intraocular foreign bodies demonstrated hyper-reflective interfaces, irrespective of their composition. Whereas the artifacts generated by different materials, it was found that the materials iron, aluminum and lead showed reverberation of great extent. The material wood showed no reverberation. The length of the reverberation artifact for the materials iron, glass, aluminum and cardboard was lower when compared to other materials. All materials presented posterior shadowing artifact, with the exception of aluminum.
CONCLUSION
Ultrasonography was considered a reliable technique to determine the size of intraocular foreign bodies in pigs, with little influence caused by its composition. Ultrasound artifacts generated were considered material-dependent and can assist the examiner to identify the nature of a foreign body of unknown etiology. Ultrasonography aided the surgeon to identify, locate and measure the intraocular foreign body, directing appropriate surgical planning.