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[Radiological study of orbital foreign body].

OBJECTIVE
To study the factors influencing of foreign body.


METHODS
527 cases of orbital foreign body was analysed and the relationship between foreign body and projection position or projection angle was retrospectively reviewed.


RESULTS
Foreign body in 13 cases was found in the lateral radiogram(No foreign body in the posteroanterior radiogram). In 12 cases foreign body was found in the Belot's radiogram(No foreign body in P. A. and lateral radiognam). In ten cases foreign body was found in the Vogts radiogram (No foreign body in P. A., lateral, Belot's radiogram). In the first radiogram, one case was found to have foreign body in the Lateral but P. A. In the second radiogram, just the reverse of above.


CONCLUSION
The image of foreign body was influenced by projection position and projection angle between foreign body and X-ray. The patients must take Belot's or Vogt's radiogram except routine P. A. and Lateral radiogram. Sometimes the patients should be taken more radiogram after moving the eye ball direction in order to find the small and flact foreign body.