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    • 3. 发明授权
    • Radiation detector
    • 辐射检测器
    • US4492869A
    • 1985-01-08
    • US313171
    • 1981-10-20
    • Atsushi SuzukiHiromichi YamadaYoko UchidaHideki KohnoMinoru Yoshida
    • Atsushi SuzukiHiromichi YamadaYoko UchidaHideki KohnoMinoru Yoshida
    • A61B6/00G01T1/164G01T1/20
    • G01T1/2002G01T1/2018
    • In a radiation detector having a radiation-stimulated light emitting scintillator and a photodetector for receiving the light emission from the scintillator, the scintillator is formed of a layer of phosphor particles and a light scattering layer is provided in an optical path between the phosphor particle layer and the photodetector. Light generated in the surface of the scintillator is scattered and absorbed by the light scattering layer in some degree so that the reduced quantity of light incident upon the photodetector lowers the output of the photodetector. This effect is balanced with the lowering of the photodetector output due to the absorption and scattering of light generated at the inner parts of the scintillator and further removes anisotropic light emission. As a result, signal-to-noise ratio is greatly improved.A shielding layer between the scintillator and photodetector prevents secondary radiation such as scattered and fluorescent radiation from reaching the photodetector. The shielding layer can also serve as the scattering layer.
    • 在具有辐射激发的发光闪烁体的辐射检测器和用于接收来自闪烁体的发光的光检测器中,闪烁体由荧光体颗粒层形成,并且光散射层设置在荧光体颗粒层 和光电检测器。 在闪烁器表面产生的光在一定程度上被光散射层散射和吸收,使得入射到光电检测器上的光的减少使得光电检测器的输出降低。 由于在闪烁器的内部部分产生的光的吸收和散射,光电检测器输出的降低会使这种效果平衡,并进一步消除各向异性发光。 结果,信噪比大大提高。 闪烁体和光电检测器之间的屏蔽层防止二次辐射如散射和荧光辐射到达光电探测器。 屏蔽层也可以用作散射层。
    • 8. 发明授权
    • Method of measuring magnetic field error of an NMR imaging apparatus and
of correcting distortion caused by the error
    • 测量NMR成像设备的磁场误差并校正由误差引起的失真的方法
    • US4791369A
    • 1988-12-13
    • US72035
    • 1987-07-10
    • Etsuji YamamotoHideki Kohno
    • Etsuji YamamotoHideki Kohno
    • A61B5/055A61B10/00G01R33/24G01R33/48G01R33/565G01R33/20
    • G01R33/24G01R33/56563G01R33/56518
    • A method of finding error distribution in the static magnetic field and distribution of deviations from straight lines in the gradient magnetic fields of an NMR imaging apparatus which employs the applied spin-warp method. A phantom whose shape has been known is measured in the read-out gradient magnetic fields having different polarities to obtain two spin density distribution images. The two images are then compared with the shape of said phantom to measure the distortion distributions of the images. Error in the static magnetic field and deviations of the gradient magnetic fields from the straight lines are analyzed from the distortion distributions. From the thus obtained error distribution, furthermore, distortion induced in imaging the object is estimated, and the distortion contained in the image that is reconstructed from the spin density of the object by the spin-warp method is corrected using the thus estimated value.
    • 在使用所采用的旋转翘曲方法的NMR成像装置的梯度磁场中找到静态磁场中的误差分布和偏离直线偏差的方法。 在具有不同极性的读出梯度磁场中测量其形状已知的体模,以获得两个自旋密度分布图像。 然后将两个图像与所述体模的形状进行比较,以测量图像的失真分布。 从失真分布中分析静态磁场的误差和梯度磁场与直线的偏差。 此外,根据这样得到的误差分布,估计在物体成像时引起的失真,并且使用这样估计的值来校正通过旋转扭曲方法从物体的自旋密度重构的图像中包含的失真。