| WO1988004518A1 | 1988-06-16 |
| US4760589A | 1988-07-26 | |||
| FR856752A | 1940-08-07 |
| 1. | The portable device for taking radiographs has the ability to hold various sizes of radiographic cassettes and to move a specially designed grid during a radiological examination. The mechanism that sets tne grid in motion may be either mechanical . by means of a tunable spring, or electrical by means of selfloading or normal batteries. |
| 2. | According to pretεntion (1) this device has a "start" command that can be set manually or by remote control.lt also has an "end" command that can be set manually or automatically. |
OF SCATTER GRID MOVEMENT
The invention refers to a portable device which has the ability to hold the various sizes of radiographi • cassettes during radiological examinations. A specially chosen scatter grid has been placed on the portable system that is set in motion by means of a driving mechanism during the X-ray exposure.
The X-ray beam that is produced by a diagnostic unit transverses through the patient and then falls on the radiographic film forming a latent image. This image appears on the film after a process of development using special chemicals. A certain amount of the radiation produced by the X-ray tube will be absorbed and scattered.
The useful diagnostic image on the radiographic film is the one that is created by the attenuation of the primary beam.
The presence of scatter causes an undesirable "fog" on the image which reduces its diagnostic value. Scatter is reduced by placing a movable scatter grid between the film and the patient. This grid absorbs scatter before falling on the film. In order to diminish scatter, the grid must move in a special way during the x-Ray exposure.
Until recently, there was' no portable cassette holder with a moving grid mechanism.
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