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  • [Radiology.] 동시 투시 및 핵 이미징을 위한 이중층 검출기A Dual-layer Detector for Simultaneous Fluoroscopic and Nuclear Imaging.

    Utrecht University / van der Velden S*

  • 출처
    Radiology.
  • 등재일
    2019 Jan 8:180796. doi: 10.1148/radiol.2018180796.
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    Abstract
    Purpose To develop and evaluate a dual-layer detector capable of acquiring intrinsically registered real-time fluoroscopic and nuclear images in the interventional radiology suite. Materials and Methods The dual-layer detector consists of an x-ray flat panel detector placed in front of a γ camera with cone beam collimator focused at the x-ray focal spot. This design relies on the x-ray detector absorbing the majority of the x-rays while it is more transparent to the higher energy γ photons. A prototype was built and dynamic phantom images were acquired. In addition, spatial resolution and system sensitivity (evaluated as counts detected within the energy window per second per megabecquerel) were measured with the prototype. Monte Carlo simulations for an improved system with varying flat panel compositions were performed to assess potential spatial resolution and system sensitivity. Results Experiments with the dual-layer detector prototype showed that spatial resolution of the nuclear images was unaffected by the addition of the flat panel (full width at half maximum, 13.6 mm at 15 cm from the collimator surface). However, addition of the flat panel lowered system sensitivity by 45%-60% because of the nonoptimized transmission of the flat panel. Simulations showed that an attenuation of 27%-35% of the γ rays in the flat panel could be achieved by decreasing the crystal thickness and housing attenuation of the flat panel. Conclusion A dual-layer detector was capable of acquiring real-time intrinsically registered hybrid images, which could aid interventional procedures involving radionuclides. Published under a CC BY-NC-ND 4.0 license. Online supplemental material is available for this article.

     


    Author information

    van der Velden S1, Kunnen B1, Koppert WJC1, Steenbergen JHL1, Dietze MMA1, Beijst C1, Viergever MA1, Lam MGEH1, de Jong HWAM1.
    1
    From the Department of Radiology and Nuclear Medicine (S.V.D.V., B.K., W.J.C.K., J.H.L.S., M.M.A.D., C.B., M.G.E.H.L., H.W.A.M.D.J.) and Image Sciences Institute (S.V.D.V., B.K., M.M.A.D., M.A.V.), University Medical Center Utrecht, Utrecht University, PO Box 85500, 3508 GA Utrecht, the Netherlands.

  • 편집위원

    엑스선 평면 패널과 콘빔 콜리메이터 부착 감마카메라가 정합된 이중층 검출기에 관한 연구로, 중간 영상재구성 과정 없이도 영상해상도의 저하없이 융합영상을 제공할 수 있는 시스템 구조의 구현 가능성을 증명한 연구임. 실시간 적용 가능한 시스템의 구현 가능성을 보임으로써 방사선중재시술 분야의 발전에 기여할 것으로 예상됨.

    2019-02-22 17:28:57

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