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    • 38. 发明公开
    • A flexible energy filter for ion beam therapy
    • Flexibler EnergiefilterfürIonenstrahltherapie
    • EP2327449A1
    • 2011-06-01
    • EP09177496.8
    • 2009-11-30
    • Paul Scherrer Institut
    • Schippers, Marco
    • A61N5/10G21K1/10
    • A61N5/1077A61N5/10A61N5/1078A61N5/1081A61N2005/1087A61N2005/1095A61N2005/1096G21K1/043G21K1/10
    • It is the objective of the present invention to provide an energy filter that allows particularly at lower beam energies a determined spread of the beam energies in order to preserve the beam edges and to spread the Bragg peak at each individual beam energy.
      This objective is achieved according to the present invention by a flexible energy filter (2) for particle beam therapy, comprising:
      a) a cushion of plastic or water equivalent material (4) or a stack of at least two soft sheets of plastic or water equivalent material (4); and
      b) attached to the surface of the cushion or to the surface of a soft sheet of plastic or water equivalent material, or embedded in the cushion or embedded in the soft sheet or between the two soft sheets of plastic or water equivalent material (4), a layer (6) of a plurality of metal particles (8), preferably metal spheres; said layer (6) having a cross sectional area corresponding at least to a cross section of a beam scanning area at an outlet of the particle beam equipment prior to its entry into a tissue.
      This energy filter behaves similar to a ridge filter and spreads out the Bragg peak of a low energy proton beam (70-100 MeV) so that energy modulation of the beam can be done with steps of 5 mm in one go over the full range of 235 - 70 MeV. Due to its mechanical flexibility, the energy filter can be placed on the skin of the patient which minimizes the effect of scattering in the filter due to the short distance behind the layer of the plurality of metal particles within the flexible soft plastic sheet (the flap) to the skin of the patient.
    • 本发明的目的是提供一种能量滤波器,其特别地允许在较低波束能量下确定射束能量的扩展,以便保留波束边缘并且在每个单独波束能量下扩展布拉格峰值。 根据本发明,通过用于粒子束治疗的柔性能量过滤器(2)实现了该目的,该柔性能量过滤器(2)包括:a)塑料或水当量材料(4)的缓冲垫或至少两层塑料或水的软片 等效材料(4); 和b)附着在衬垫的表面或塑料或水当量材料的软片的表面上,或嵌入在衬垫中或嵌入软片中或在两片软质塑料或水当量材料之间(4 ),多个金属颗粒(8)的层(6),优选金属球体; 所述层(6)的横截面积至少对应于粒子束设备在其进入组织之前的出口处的束扫描区域的横截面。 该能量滤波器的行为与脊形滤波器相似,并扩展出低能量质子束(70-100MeV)的布拉格峰,从而能够以5毫米的步长在一整个范围内完成光束的能量调制 235 - 70 MeV。 由于其机械灵活性,能量过滤器可以放置在患者的皮肤上,由于柔性软塑料片内的多个金属颗粒层之后的短距离(瓣片),滤膜中散射的影响最小化 )到患者的皮肤。