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X-ray film holding apparatus providing tight contact between film and intensifying screen
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Inventors: Ogo, Yoshimasa;
Assignee: Kabushiki Kaisha Toshiba (Kawasaki, JP)
Primary Examiner: Church; Craig E.
Assistant Examiner: Grigsby; T. N.
Attorney, Agent or Firm: Oblon, Fisher, Spivak, McClelland, & Maier
An X-ray film holding apparatus includes front and rear plates through which X-rays transmit. The front and rear plates respectively have opposite surfaces. The front plate is flexible, and the opposite surface of the front plate has a partial spherical portion extending toward the rear plate. The spherical surface is curved along a first direction and a second direction perpendicular to the first direction. The front plate is rectangular, and its three sides are supported by a holding frame. An elastic cushion member is adhered to the opposite surface of the rear plate. The cushion member has a surface opposite to the front plate. The opposite surface of the cushion member has a partial cylindrical surface extending toward the front plate. The cylindrical surface is curved along the first direction and parallel to the second direction. Intensifying screen sheets are respectively adhered to the opposite surfaces of the front plate and the cushion member. The holding frame and the rear plate come close to or are separated from each other. An X-ray film can be tightly held between the front plate and the cushion member. |
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DETAILED DESCRIPTION According to an aspect of the present invention, there is provided an X-ray film holding apparatus for holding an X-ray film, comprising: a front plate through which X-rays transmit and a rear plate, said front and rear plates being provided with opposite surfaces, respectively, said front plate being flexible, said opposite surface of said front plate being provided with a curved portion extending toward said rear plate, said curved portion being curved along first and second directions, the first and second directions crossing to each other; a holding frame for holding at least part of the periphery of said front plate; a cushion member having elasticity and provided on said opposite surface of said rear plate, said cushion member being provided with a surface opposite to said front plate, said opposite surface of said cushion member being provided with a curved portion extending toward said front plate, said curved portion of said cushion member being curved along at least one of the first and second directions; intensifying screen means lain between said opposite surfaces of said front plate and said cushion member; and supporting means for supporting said holding frame and said rear plate to allow tight contact between the X-ray film and said intensifying screen means lain between said opposite surfaces of said front plate and said cushion member.
According to the X-ray film holding apparatus of the present invention, when an X-ray film is loaded therein and pressed by the rear plate, the contact force is radially decreased.
In other words, the pressure gradient occurs radially after the X-ray film is pressed.
For this reason, no air gap is formed between the film and the intensifying screen means.
Even if an air layer is formed between the film and the screen means, it is smoothly eliminated to provide tight contact between the film and the intensifying screen means, thereby obtaining a roentgenogram with high quality.
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