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Minicamera for proximity detection of nuclear radiation emitted by a radioisotope, and its application as a surgical tool

  • US 5,428,223 A
  • Filed: 04/25/1994
  • Issued: 06/27/1995
  • Est. Priority Date: 04/28/1993
  • Status: Expired due to Fees
First Claim
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1. A minicamera for the detection of at least a composite β

  • and γ

    nuclear radiation, or a γ

    nuclear radiation associated with conversion electrons assimilated with a β

    radiation, emitted by a radioisotope present in a body, said minicamera having an image pick-up head comprising a β

    radiation collimator which is transparent to the γ

    radiation, a scintillator and a photodetector assembly, characterized in that said image pick-up head also comprises a modulating grid with holes which is arranged between the collimator and the scintillator so as to be movable by a mechanism so that in an alternating fashion it opens the holes of the collimator in a first position and closes these holes in a second position, said photodetector assembly being controlled so as to integrate the alternating signals supplied by the scintillator in said first position and said second position of the modulating grid and to apply these signals selectively to a first, open-grid image memory and to a second, closed-grid image memory, said minicamera also comprising means for calculation and comparison of signals stored in said first and second image memories in order to supply the useful image to be displayed.

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