X-ray or gamma ray systems or devices – Specific application – Dental panoramic
Patent
1988-01-29
1989-10-31
Church, Craig E.
X-ray or gamma ray systems or devices
Specific application
Dental panoramic
25037009, A61B 614
Patent
active
048782343
ABSTRACT:
A dental x-ray diagnostics installation for producing panorama tomograms of the jaw of a patient has a radiation source and a detector, which converts x-radiation into corresponding light radiation, disposed on opposite sides of the patient. The detector is preceded by a secondary diaphragm. The radiation source, the detector and the secondary diaphragm are rotated around the patient so that radiation attenuated by the jaw, and passing through the secondary diaphragm is incident on the detector. At least one CCD sensor is provided on which light radiation generated by the detector is incident. The CCD sensor converts the light radiation into electrical signals. The sensor has an image zone with a number of lines parallel to a longitudinal extent of the opening of the secondary diaphragm, and has a storage zone. The lines in combination receive all of the light radiation so as to generate a complete charge image corresponding to the x-radiation incident on the detector. A clock generator is provided which controls transfer of the charge from the lines of the image zone into the storage zone, and also controls read-out of the storage zone. By selecting the frequency of the clock pulses generated by the clock pulse generator, the transfer and read-out speed can be selected to simulate the speed of movement of x-ray film in a conventional dental panorama tomography apparatus.
REFERENCES:
patent: 4160997 (1979-07-01), Schwartz
patent: 4188537 (1980-02-01), Franke
patent: 4239971 (1980-12-01), Cushman
patent: 4298800 (1981-11-01), Goldman
patent: 4383327 (1983-05-01), Kruger
patent: 4492869 (1985-01-01), Suzuki et al.
"Direct Soft X-Ray Response of a Charge-Coupled Image Sensor," Koppel, Rev. Sci. Instrum., vol. 48, No. 6, Jun. 1977, pp. 669-672.
Guenther Werner
Heubeck Erich
Muether Manfred
Pfeiffer Joachim
Church Craig E.
Siemens Aktiengesellschaft
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