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Dosimetric scintillating screen detector for charged particle radiotherapy quality assurance

  • US 9,750,958 B2
  • Filed: 10/30/2014
  • Issued: 09/05/2017
  • Est. Priority Date: 02/23/2012
  • Status: Active Grant
First Claim
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1. An apparatus for determining the spatial distribution and intensity of a penetrating radiation beam characterized generally by a propagation direction inside a body, the apparatus comprising:

  • a tissue phantom disposed between a radiation source and a radiation detector;

    a scintillating screen disposed behind the tissue phantom for emitting light in response to the radiation received by the scintillating screen, the scintillating screen comprising a mixture of at least two scintillators wherein each scintillator has a different characteristic response and a different spectral output;

    a means of optical communication between the output of the scintillating screen and at least one imaging sensor, wherein the means of optical communication has a nonuniform spectral transmission; and

    at least one imaging sensor in optical communication with the scintillating screen for providing a high resolution imaging sensor output indicative of the spatial distribution and intensity of the radiation beam, wherein the imaging sensor has a nonuniform spectral sensitivity;

    wherein the composition of the scintillating screen, the means of optical communication, and the at least one imaging sensor form a system wherein the relative contribution of the at least two scintillators of the mixture produce an imaging sensor output which is proportional to a characteristic of the radiation beam incident on the scintillating screen at each measurement position accessible with the tissue phantom;

    wherein each scintillator of the mixture contributes a detection signal per deposited energy Dn(LET,F)=∫



    ρ

    nSn

    )En(LET,F)An

    )Q(λ

    )T(λ

    ) to the total imaging sensor output and a fractional contribution

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