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Title:
PORTABLE RADIOGRAPHIC CASSETTE HOLDER WITH A MECHANISM OF SCATTER GRID MOVEMENT
Document Type and Number:
WIPO Patent Application WO/1993/017367
Kind Code:
A1
Abstract:
The invention refers to a portable system that gives the opportunity to take radiographs from a portable X-ray unit in areas outside radiological rooms with no scattered radiation reaching the film. The device succeeds in reducing the scatter by means of a portable mechanism that moves the grid during the radiological examination. High quality radiographs are produced in this way.

Inventors:
Kaloumenos, Elefterios
Application Number:
PCT/GR1993/000003
Publication Date:
September 02, 1993
Filing Date:
February 19, 1993
Export Citation:
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Assignee:
Kaloumenos, Elefterios
International Classes:
A61B6/00; G03B42/02; (IPC1-7): A61B6/00; G03B42/02
Domestic Patent References:
WO1988004518A1
Foreign References:
US4760589A
FR856752A
Download PDF:
Claims:
CLAIMS
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.
Description:
PORTABLE RADIOGRAPHIC CASSETTE HOLDER WITH A MECHANISM

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.