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1. 发明授权

US4857722A Apparatus for stabilizing the amplification degree of photomultipliers 失效
标题翻译：用于稳定光电倍增管放大度的装置
公开(公告)号：US4857722A
公开(公告)日：1989-08-15
申请号：US165194
申请日：1987-12-28
申请人： Yoshihiko Kumazawa , Tsunekazu Matsuyama
发明人： Yoshihiko Kumazawa , Tsunekazu Matsuyama
IPC分类号： G01T1/164 , G01T1/208
CPC分类号： G01T1/208 , G01T1/1642
摘要： In an apparatus for automatically stabilizing the amplification degrees of photomultipliers (PMT's) in a detector having a scintillator and a plurality of PMT's, the PMT's (3) are classified into groups (A, B, C and D) and arranged such that the PMT's of the same group are not disposed adjacent to each other. Outputs taken from the PMT's (3) are classified according to the groups and summed in adders (6) allotted to the respective groups. A sum signal taken from a group which includes a PMT disposed closest to a scintillation is analyzed by a pulse height analyzer (14). The outputs from the pulse height analyzer are collected in a counter memory (15) as statistical data on a change in the amplification degrees of PMT's. Data on the high voltage to be applied to each PMT (3) is recorded beforehand in a register (17) and this data is corrected by a data processing circuit (16) in accordance with the statistical data. The data on the amplification degree of each PMT can be collected in parallel so that the amplification degree of each PMT (3) may be stabilized in a short time.

2. 发明授权

US4661909A Scintillation camera with pulse height analyzer 失效
标题翻译：带脉冲高度分析仪的闪烁相机
公开(公告)号：US4661909A
公开(公告)日：1987-04-28
申请号：US553784
申请日：1983-11-21
申请人： Yoshihiko Kumazawa , Tsunekazu Matsuyama
发明人： Yoshihiko Kumazawa , Tsunekazu Matsuyama
IPC分类号： G01T1/164 , G06F15/42 , G01T1/20
CPC分类号： G01T1/1642 , Y10S128/922 , Y10S378/901
摘要： A radiation imaging apparatus provided with a pulse height analyzer for checking whether the pulse height of the energy signal produced in response to each scintillation event falls within an energy window set for the particular (x,y) coordinate position of the scintillation. The pulse height analyzer has a memory for storing a plurality of energy windows each for a particular one of the coordinate positions in the scintillator and each having a particular central level and a particular width such that the nonuniformity of the sensitivity of the detector due to the position-dependency of the energy signal and/or other causes can be corrected. A preliminary pulse height analyzer may be provided to increase the counting rate of energy signals useful for image production.
摘要翻译：一种具有脉冲高度分析器的放射线成像设备，用于检查响应于每个闪烁事件产生的能量信号的脉冲高度是否落入闪烁的特定（x，y）坐标位置设置的能量窗内。脉冲高度分析器具有用于存储闪烁体中的特定一个坐标位置的多个能量窗口的存储器，每个能量窗口具有特定的中心水平和特定宽度，使得由于检测器的灵敏度的不均匀性可以校正能量信号的位置依赖性和/或其他原因。可以提供初步脉冲高度分析器来增加用于图像生成的能量信号的计数率。

3. 发明授权

US5466939A Nuclear medicine imaging apparatus 失效
标题翻译：核医学成像仪器
公开(公告)号：US5466939A
公开(公告)日：1995-11-14
申请号：US124860
申请日：1993-09-22
申请人： Yoshihiko Kumazawa , Kazumi Tanaka
发明人： Yoshihiko Kumazawa , Kazumi Tanaka
IPC分类号： G01T1/164 , G01T1/166
CPC分类号： G01T1/1647
摘要： A first image collection memory collects two-dimensional image data within a predetermined energy window to constitute a fine matrix. A second image collection memory collects three-dimensional image data, including energy spectral information, to constitute a coarse matrix. Each pixel of the data collected in the second image collection memory is subjected to a scatter correction with energy weighted acquisition using a weight function. Correction coefficients are derived from a ratio between data before the correction and data after the correction, and by interpolation processing for each pixel in the fine matrix, and are applied to the image data collected in the first image collection memory. The data collected in the second image collection memory is subjected to two-dimensional low-pass filter processing. The scatter correction with the energy weighted acquisition is effected for each data collected in the second image collection memory such that the function is applied to the data before the filter processing, or after the filter processing.
摘要翻译：第一图像采集存储器在预定能量窗口内收集二维图像数据以构成精细矩阵。第二图像采集存储器收集三维图像数据，包括能量谱信息，以构成粗略矩阵。使用加权函数对在第二图像采集存储器中收集的数据的每个像素进行能量加权获取的散射校正。校正系数是从校正前的数据和校正后的数据之间的比率以及通过精细矩阵中的每个像素的内插处理得出的，并被应用于收集在第一图像采集存储器中的图像数据。收集在第二图像采集存储器中的数据经受二维低通滤波处理。对于在第二图像采集存储器中收集的每个数据进行能量加权获取的散射校正，使得该功能被应用于滤波处理之前的数据或滤波处理之后。

4. 发明授权

US4727256A Semiconductor radiation detector 失效
标题翻译：半导体辐射探测器
公开(公告)号：US4727256A
公开(公告)日：1988-02-23
申请号：US749212
申请日：1985-06-27
申请人： Yoshihiko Kumazawa
发明人： Yoshihiko Kumazawa
IPC分类号： G01T1/24
CPC分类号： G01T1/247
摘要： Semiconductor radiation detector comprising a radiation detecting element made of a compound semiconductor and operable at room temperature in response to a radiation event to produce a corresponding output signal; a preamplifier for preamplifying the output from the detecting element to produce a corresponding signal; and pulse shaping amplifier including a quasi-gaussian filter comprising a combination of a first differentiator and an integrator to shape and amplify the signal from the preamplifier; means for obtaining information about charge collection time at each radiation event by comparing the pulse height of a signal caused by the output from the differentiator and the pulse height of the output from the shaping amplifier; and means for correcting the pulse height of the output signal form the shaping amplifier in accordance with the information about charge collection time at each radiation event, thereby to improve the deterioration of the energy resolution caused by incomplete charge collection. There is also provided a semiconductor position-sensitive radiation detector which employs a plurality of the above-mentioned compound semiconductor radiation detecting elements so arranged in row and column as to form a matrix and which can be used effectively, for example, in nuclear medicine.
摘要翻译：半导体辐射检测器，包括由化合物半导体制成的辐射检测元件，并且响应于辐射事件在室温下可操作以产生相应的输出信号; 前置放大器，用于对来自检测元件的输出进行前置放大以产生相应的信号; 以及包括包含第一微分器和积分器的组合的准高斯滤波器以形成和放大来自前置放大器的信号的脉冲整形放大器; 用于通过比较由微分器的输出引起的信号的脉冲高度和来自整形放大器的输出的脉冲高度来获得关于每个辐射事件的电荷收集时间的信息的装置; 以及用于根据关于每个辐射事件处的电荷收集时间的信息从整形放大器校正输出信号的脉冲高度的装置，从而改善由不完全的电荷收集引起的能量分辨率的劣化。还提供了一种半导体位置敏感的放射线检测器，其使用多个上述化合物半导体辐射检测元件，其排列成行和列以形成基质，并且可以有效地用于例如核医学中。

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