| 摘要 |
Intra-oral dental X-ray apparatus for panoramic radiography comprises a tubular target carrier 331 supporting at its distal end a target 338 having an inclined forward face. Image definition is improved by positioning in the path of the X-rays a window 313 of X-ray transmitting ceramic material, e.g. 90% oxide of Be, or Al, 7% SiO2. The target carrier forms a probe which can be positioned in the patient's mouth. X- rays are directed forwardly and laterally of the target to an X-ray film positioned externally. Optionally the probe is provided with a detachable sleeve having V-form arms of X-ray opaque material which serve to depress the tongue out of the radiation path and also shield the roof of the mouth and other regions of the head from the X-ray pattern. A part cylindrical lead shield 339 defines the X-ray beam angle. <IMAGE>
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