Department of Oral Diagnosis and Radiology, Faculty of Dentistry, Gaziantep University, Gaziantep, Turkey.
Dentomaxillofac Radiol. 2010 Feb;39(2):72-8. doi: 10.1259/dmfr/68589458.
The purpose of this study was to compare the sensitivity for detecting foreign bodies among conventional plain radiography, CT and ultrasonography in in vitro models.
Seven different materials were selected as foreign bodies with dimensions of approximately 1 x 1 x 0.1 cm. These materials were metal, glass, wood, stone, acrylic, graphite and Bakelite. These foreign bodies were placed into a sheep's head between the corpus mandible and muscle, in the tongue and in the maxillary sinus. Conventional plain radiography, CT and ultrasonography imaging methods were compared to investigate their sensitivity for detecting these foreign bodies.
Metal, glass and stone can be detected with all the visualization techniques used in the study in all of the zones. In contrast to this, foreign bodies with low radiopacity, which could be detected in air with CT, became less visible or almost invisible in muscle tissue and between bone and muscle tissue. The performance of ultrasonography for visualizing foreign bodies with low radiopacity is relatively better than CT.
Ultrasonography detects and localizes superficial foreign bodies with low radiopacity in the tissues of the body more effectively than CT and conventional plain radiography. However, CT is a more effective technique for visualization of foreign bodies in air than ultrasound and conventional plain radiography.
本研究旨在比较常规 X 线摄影、CT 和超声在体外模型中检测异物的敏感性。
选择七种不同的材料作为异物，尺寸约为 1 x 1 x 0.1 厘米。这些材料为金属、玻璃、木材、石头、亚克力、石墨和胶木。将这些异物置于羊头下颌骨和肌肉之间、舌部和上颌窦内。比较常规 X 线摄影、CT 和超声成像方法，以研究它们检测这些异物的敏感性。
金属、玻璃和石头可以通过研究中使用的所有可视化技术在所有区域检测到。相比之下，在 CT 下可以在空气中检测到的低放射密度异物，在肌肉组织和骨与肌肉组织之间变得不太明显或几乎不可见。超声检查用于可视化低放射密度异物的性能优于 CT。
超声检查比 CT 和常规 X 线摄影更有效地检测和定位身体组织中低放射密度的浅表异物。然而，与超声和常规 X 线摄影相比，CT 是一种更有效的空气中外异物可视化技术。
