Myllylä V, Pyhtinen J, Päivänsalo M, Tervonen O, Koskela P
Rofo. 1987 Jun;146(6):639-43. doi: 10.1055/s-2008-1048557.
The series comprises 27 patients examined by CT to detect, locate or exclude a foreign body. 22 of them actually had an orbital foreign body. In three cases CT was the primary method and showed the foreign body correctly, while in 18 it was first detected in plain films and CT was performed to locate it. 20 metallic foreign bodies were hyperdense in appearance. Two cases had wooden foreign bodies, one with a density of +10 HU and the other hypodense with a value of about -434 to -446 HU. The latter piece of wood was first interpreted falsely as a bubble of gas. The results proved that the detection of metal is easy, but differentiation between wood and gas is problematical. Experiments conducted to determine the CT densities of different pieces of wood gave results varying from -618 HU to +23 HU. The highest densities obtained for glass varied from +522 HU to +2000 HU. The density of a plastic lens was -105 HU.
该系列包括27例接受CT检查以检测、定位或排除异物的患者。其中22例实际存在眼眶异物。3例中CT是主要检查方法且正确显示了异物，而在18例中异物首先在平片中被发现，随后进行CT检查以定位异物。20个金属异物在图像上表现为高密度。2例有木质异物，1例密度为+10 HU，另1例低密度，值约为-434至-446 HU。后一块木头最初被错误地解释为气泡。结果证明，金属的检测容易，但区分木头和气体存在问题。为确定不同木块的CT密度而进行的实验结果在-618 HU至+23 HU之间变化。玻璃获得的最高密度在+522 HU至+2000 HU之间。塑料镜片的密度为-105 HU。
