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    • 4. 发明授权
    • Variable angle slant hole collimator
    • 可变角度倾斜准直器
    • US4419585A
    • 1983-12-06
    • US238582
    • 1981-02-26
    • H. William StraussRichard H. MooreNathaniel M. Alpert
    • H. William StraussRichard H. MooreNathaniel M. Alpert
    • G02B5/00G21K1/02G21K1/00H01J1/52
    • G21K1/025G02B5/005
    • A variable angle radiation collimator particularly for use in gamma-photon medical diagnostic systems in a gamma-photon camera system for radiological examination of human subjects. The collimator provides collimation of gamma-photon radiation along a single beam direction which may be varied along two axes to adjust exposure angle or to provide a scanning capability. The collimator is a stack of substantially identical radiation-opaque plates, each of which are apertured with a similar array of openings. The combined effect of the stacked aperture plates is to transmit radiation in a predetermined orientation. The collimated angle of the radiation thus generated is controlled by the coincidence of the array of openings. The stack is retained by a mechanism which permits adjustment of the collimation angle, and the plates are fabricated to provide ease of shear motion during such adjustment. In addition, the tradeoff between the resolution and intensity of radiation transmitted may be easily varied by adjusting stack thickness.
    • 一种可变角度辐射准直仪,特别用于γ射线照相机系统中伽马光子医学诊断系统,用于人类受试者的放射学检查。 准直器提供沿着单个光束方向的伽马光子辐射的准直,其可以沿两个轴线变化以调节曝光角度或提供扫描能力。 准直器是基本上相同的辐射不透明板的堆叠,其每个都具有类似的开口阵列。 堆叠的孔板的组合效果是以预定方向透射辐射。 由此产生的辐射的准直角由开口阵列的一致性来控制。 该堆叠被允许调整准直角的机构保持,并且制造这些板以在这种调节期间提供剪切运动的容易性。 此外,通过调整堆叠厚度,可以容易地改变透射的辐射的分辨率和强度之间的折衷。