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ON THE POSSIBILITIES OF ULTRASONIC DETECTION OF INTRAORBITAL FOREIGN BODIES
Author(s) -
LARSEN JON S.
Publication year - 1973
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.1973.tb06056.x
Subject(s) - foreign bodies , anatomy , ultrasonic sensor , ultrasonography , subcutaneous fat , ultrasound , foreign body , medicine , radiology , surgery , adipose tissue , endocrinology
Human orbital fat tissue removed at autopsy was used for ultrasonic examinations of standardized foreign bodies. The effect of attenuation of the ultrasound echo caused by orbital fat tissue was investigated. The foreign bodies quickly lost their echographical identity as they were covered by thicker layers of orbital fat. The limit for ultrasonic detection of foreign bodies with a reflecting echo corresponding to that of pieces of iron foil measuring 0.35×0.35 mm and 1.0×1.0 mm had been reached when they were buried beneath layers of orbital fat 1 mm and 3 mm thick, respectively. Ultrasonography thus appears to be of use only in the detection of foreign bodies located in the superficial layers of the orbital fat. In clinical ophthalmology, however, it is important to be able to ascertain that foreign bodies in just this position are, in fact, located extra‐bulbarly.