Special Circuits for an X-Ray Television Camera Chain

T. Heise, J. E. Marquerinck, C. J. Seur

Medical application of a TV camera together with an x-ray image-intensifier tube requires highest sensitivity and automatic adaptation to different x-ray doses. Maximum sensitivity of the special x-ray TV system has been obtained by imaging of the circular picture on the whole of the also circular target of the vidicon or Plumbicon with the aid of a large-aperture lens. Overscanning the target necessitates a circular blanking signal. The transistor circuit generating this signal is described with emphasis on stability problems. Automatic sensitivity control is effected by light-dependent resistors in the video amplifier. The control voltage is obtained by measuring the peak value of the signal either over the whole of the picture or in a central circular area only.

Print ISSN
Published
1966-07
Content type
Original Research
DOI
10.5594/J07128