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1. 发明授权

US5627367A Radiation beam calibrater 失效
标题翻译：辐射光束校准器
公开(公告)号：US5627367A
公开(公告)日：1997-05-06
申请号：US662313
申请日：1996-06-13
申请人： Jack C. Sofield
发明人： Jack C. Sofield
IPC分类号： A61N5/10 , G01T1/185 , G01T1/29
CPC分类号： G01T1/2914 , G01T1/185 , G01T1/2964 , A61N2005/1076 , A61N5/1048
摘要： A radiation beam scanner system employs a peak detection methodology to measure the intensity and distribution of radiation produced by a medical linear accelerator. The scanner system combines the capability to perform scanning measurements with the capability to perform high accuracy calibrations of the linear accelerator. The system employs two ion chamber detectors, signal and reference, with the signal detector positioned within a tank of water (phantom tank). As the water is irradiated by the linear accelerator, the signal detector is continuously moved within the water by means of electrical stepper motors as the reference detector remains stationary at some point within the radiation beam. The reference detector output is compared to a predetermined threshold and, when the threshold is reached, a peak detector circuit monitors the signal detector output for a radiation pulse peak. Accelerator anomalies are eliminated by calculating a ratio of the signal detector output to the reference detector output. Each ratio is time tagged and correlated to signal detector position information, thereby providing a map of the distribution and intensity of the radiation within the water. The resultant data is evaluated by a qualified medical physicist to ascertain the accelerator's suitability for use in dosimetry. In one embodiment, the pulse frequency of the accelerator is determined and the rate of signal detector movement (scan rate) is set as a function of the pulse frequency of the accelerator. The system includes a unique, integrating, auto-zeroing, calibration electrometer that can be employed to calibrate the accelerometer.
摘要翻译：辐射束扫描器系统采用峰值检测方法来测量由医用线性加速器产生的辐射的强度和分布。扫描仪系统将执行扫描测量的能力与执行线性加速器的高精度校准相结合。该系统采用两个离子室检测器，信号和参考，信号检测器位于水箱（幻影池）内。当水被线性加速器照射时，信号检测器借助于电动步进电机在水中连续移动，因为参考检测器在辐射束内的某个点保持静止。将参考检测器输出与预定阈值进行比较，并且当达到阈值时，峰值检测器电路监测信号检测器输出的辐射脉冲峰值。通过计算信号检测器输出与参考检测器输出的比例来消除加速器异常。每个比率被时间标记并与信号检测器位置信息相关联，从而提供水中辐射的分布和强度的图。所得数据由合格的医学物理学家评估，以确定加速器在剂量测定中的适用性。在一个实施例中，确定加速器的脉冲频率，并且将信号检测器移动速率（扫描速率）设置为加速器的脉冲频率的函数。该系统包括一个独特的积分自动归零校准静电计，可用于校准加速度计。

2. 发明授权

US5621214A Radiation beam scanner 失效
标题翻译：辐射束扫描仪
公开(公告)号：US5621214A
公开(公告)日：1997-04-15
申请号：US541374
申请日：1995-10-10
申请人： Jack C. Sofield
发明人： Jack C. Sofield
IPC分类号： A61N5/10 , G01T1/185 , G01T1/29
CPC分类号： G01T1/2914 , G01T1/185 , G01T1/2964 , A61N2005/1076 , A61N5/1048
摘要： A radiation beam scanner system employs a peak detection methodology to measure the intensity and distribution of radiation produced by a medical linear accelerator. The scanner system combines the capability to perform scanning measurements with the capability to perform high accuracy calibrations of the linear accelerator. The system employs two ion chamber detectors, signal and reference, with the signal detector positioned within a tank of water (phantom tank). As the water is irradiated by the linear accelerator, the signal detector is continuously moved within the water by means of electrical stepper motors as the reference detector remains stationary at some point within the radiation beam. The reference detector output is compared to a predetermined threshold and, when the threshold is reached, a peak detector circuit monitors the signal detector output for a radiation pulse peak. Accelerator anomalies are eliminated by calculating a ratio of the signal detector output to the reference detector output. Each ratio is time tagged and correlated to signal detector position information, thereby providing a map of the distribution and intensity of the radiation within the water. The resultant data is evaluated by a qualified medical physicist to ascertain the accelerator's suitability for use in dosimetry. In one embodiment, the pulse frequency of the accelerator is determined and the rate of signal detector movement (scan rate) is set as a function of the pulse frequency of the accelerator. The system includes a unique, integrating, auto-zeroing, calibration electrometer that can be employed to calibrate the accelerometer.
摘要翻译：辐射束扫描器系统采用峰值检测方法来测量由医用线性加速器产生的辐射的强度和分布。扫描仪系统将执行扫描测量的能力与执行线性加速器的高精度校准相结合。该系统采用两个离子室检测器，信号和参考，信号检测器位于水箱（幻影池）内。当水被线性加速器照射时，信号检测器借助于电动步进电机在水中连续移动，因为参考检测器在辐射束内的某个点保持静止。将参考检测器输出与预定阈值进行比较，并且当达到阈值时，峰值检测器电路监测信号检测器输出的辐射脉冲峰值。通过计算信号检测器输出与参考检测器输出的比例来消除加速器异常。每个比率被时间标记并与信号检测器位置信息相关联，从而提供水中辐射的分布和强度的图。所得数据由合格的医学物理学家评估，以确定加速器在剂量测定中的适用性。在一个实施例中，确定加速器的脉冲频率，并且将信号检测器移动速率（扫描速率）设置为加速器的脉冲频率的函数。该系统包括一个独特的积分自动归零校准静电计，可用于校准加速度计。

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