Boots – shoes – and leggings
Patent
1983-12-23
1987-01-13
Smith, Jerry
Boots, shoes, and leggings
378901, 378 99, 358111, H04N 532
Patent
active
046369546
ABSTRACT:
An X-ray diagnostic apparatus comprising an X-ray source for irradiating X rays to a patient, an image intensifier tube for converting an X-ray image, formed by transmitting X rays through the patient to an optical image, a television camera for receiving the optical image from the image intensifier tube through a diaphragm to output the video signal. In this pick-up apparatus, the X-ray source pre-irradiates one time a small dose of X-rays before main irradiation and there are provided a detector for detecting the maximum value of the video signal produced from the camera at the time of pre-irradiation, and an arithmetic operation circuit for calculating a diaphragm value from the maximum value detected and from pick-up conditions except a diaphragm value at the time of main irradiation of X rays in such a way that the maximum value of the video signal from the camera at the time of main irradiation becomes equal to the maximum permissible value of the camera.
REFERENCES:
patent: 4350941 (1982-09-01), McClure et al.
patent: 4359759 (1982-11-01), McBride et al.
patent: 4394738 (1983-07-01), Wagner
patent: 4432014 (1984-02-01), Roos et al.
patent: 4473843 (1984-09-01), Bishop et al.
Fujii Senzo
Komatsu Kenichi
Meyer Charles B.
Smith Jerry
Tokyo Shibaura Denki Kabushiki Kaisha
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