公开(公告)号：US20120305792A1

公开(公告)日：2012-12-06

申请号：US13480157

申请日：2012-05-24

申请人： Takeshi KUWABARA ,  Keita WATANABE ,  Jun ENOMOTO ,  Yasufumi ODA ,  Takeshi KOISHI

发明人： Takeshi KUWABARA ,  Keita WATANABE ,  Jun ENOMOTO ,  Yasufumi ODA ,  Takeshi KOISHI

IPC分类号： G01T1/17

CPC分类号： G01T1/243 ,  G01T1/17 ,  G01T1/2018 ,  H04N5/32

摘要： An x-ray image detector monitors the intensity of incident x-rays to detect an end of radiation from an x-ray source when the x-ray intensity decreases to a threshold level or less. The x-ray intensity gets down to zero with a variable time lag from the start of decreasing, called radiation wave tail. Depending on the gradient of declivity in time curve of the decreasing x-ray intensity, calculated at the time when the end of radiation is detected, the x-ray image detector decides a delay time from the end-of-radiation detection time to a reading start time to start reading signal charges from the image detector. Thus, the reading start time may be adjusted to the point when the x-ray intensity gets down to zero, which will improve S/N ratio and prevent shading artifacts.

摘要翻译： 当X射线强度降低到阈值水平或更低时，X射线图像检测器监测入射的X射线的强度以检测来自X射线源的辐射的结束。 X射线强度从减小开始的可变时间滞后变为零，称为辐射波尾。 根据在检测到辐射结束时计算出的x射线强度减小的时间曲线下的倾斜度的梯度，X射线图像检测器决定从放射检测结束时间到延迟时间的延迟时间 读取开始时间开始从图像检测器读取信号电荷。 因此，可以将读取开始时间调整为当x射线强度降至零时的点，这将提高S / N比并防止遮蔽伪像。

公开(公告)号：US20120305791A1

公开(公告)日：2012-12-06

申请号：US13480136

申请日：2012-05-24

申请人： Keita WATANABE ,  Takeshi KUWABARA ,  Yasufumi ODA ,  Jun ENOMOTO ,  Takeshi KOISHI

发明人： Keita WATANABE ,  Takeshi KUWABARA ,  Yasufumi ODA ,  Jun ENOMOTO ,  Takeshi KOISHI

IPC分类号： G01T1/16

CPC分类号： G01T1/247 ,  G01T1/208 ,  G01T1/24 ,  H04N5/32

摘要： A flat panel detector has an imaging area, in which pixels are arrayed in a matrix and signal lines for reading out electric signals from the pixels are provided, to detect an image of a subject from x-rays which are incident on the imaging area after penetrating the subject. Detective elements are arranged in the imaging area, to output electric signals corresponding to incident x-rays. Based on previously stored sensitivity data on the detective elements, high-sensitivity elements are selected from among the detective elements. The start of radiation and the end of radiation of x-rays toward the imaging area are detected by monitoring the electric signals from the selected high-sensitivity elements, to control operation of the imaging device on the basis of the detected start and end of radiation.

摘要翻译： 平板检测器具有成像区域，其中像素被排列成矩阵，并且提供用于从像素读出电信号的信号线，以便在来自入射到成像区域的X射线之后的X射线上检测被摄体的图像 穿透主题。 检测元件布置在成像区域中，以输出对应于入射的X射线的电信号。 基于先前存储的检测元件的灵敏度数据，从检测元件中选择高灵敏度元素。 通过监测来自所选择的高灵敏度元件的电信号来检测X射线朝向成像区域的辐射开始和X射线的辐射结束，以根据检测到的辐射开始和结束来控制成像装置的操作 。

公开(公告)号：US20120201357A1

公开(公告)日：2012-08-09

申请号：US13362857

申请日：2012-01-31

申请人： Keita WATANABE ,  Kentaro NOMA

发明人： Keita WATANABE ,  Kentaro NOMA

IPC分类号： H05G1/56 ,  H05G1/64

CPC分类号： H04N5/32 ,  A61B6/4233 ,  H04N5/232 ,  H04N5/361 ,  H05G1/64

摘要： An FPD, being offline from an X-ray source, detects X-ray irradiation from the X-ray source to detect an X-ray image. The FPD includes pixels arranged in two dimensions, scan lines corresponding to respective rows of the pixels, signal lines corresponding to respective columns of the pixels, and switching elements provided to the respective pixels to allow performing accumulation operation or readout operation. At least one of the pixels is used as a detection pixel to detect a start of the X-ray irradiation. First and second voltage signals are obtained successively through the signal line to which the detection pixel is connected. The start of the X-ray irradiation is judged based on a difference between the first and second voltage signals.

摘要翻译： 从X射线源离线的FPD检测X射线源的X射线照射，以检测X射线图像。 FPD包括二维排列的像素，对应于像素的各行的扫描线，对应于像素的各列的信号线以及提供给各个像素的开关元件，以允许执行累积操作或读出操作。 使用至少一个像素作为检测像素来检测X射线照射的开始。 通过与检测像素连接的信号线连续获得第一和第二电压信号。 基于第一和第二电压信号之间的差来判断X射线照射的开始。

公开(公告)号：US20120074332A1

公开(公告)日：2012-03-29

申请号：US13239741

申请日：2011-09-22

申请人： Keita WATANABE

发明人： Keita WATANABE

IPC分类号： G01T1/16

CPC分类号： G01T1/247 ,  G01T1/243 ,  H04N5/32

摘要： A flat panel detector (FPD) includes an imaging panel having pixels arranged in a matrix, a gate driver for turning thin film transistors (TFTs) of the pixels ON and OFF, a radiation detecting section for detecting the start of x-ray radiation from the x-ray source, and a controller. The controller controls the gate driver to turn the TFTs ON periodically to reset dark charges of the pixels. Before starting a charge accumulating operation for accumulating signal charges for imaging, the controller controls the gate driver to turn the TFTs OFF so that the radiation detecting section may detect the start of x-ray radiation on the basis of charge leaks from the pixels. When the start of x-ray radiation is detected, the controller starts the charge accumulating operation while keeping the TFTs in the OFF condition. Thereafter, the TFTs are turned ON to read out the accumulated signal charges.

摘要翻译： 平板检测器（FPD）包括具有排列成矩阵的像素的成像面板，用于转动像素的薄膜晶体管（TFT）的导通和截止的栅极驱动器，用于检测从X射线 X射线源和控制器。 控制器控制栅极驱动器周期性地打开TFT，以重置像素的暗电荷。 在开始累积用于成像的信号电荷的电荷累积操作之前，控制器控制栅极驱动器关闭TFT，使得放射线检测部分可以基于来自像素的电荷泄漏来检测X射线辐射的开始。 当检测到X射线辐射的开始时，控制器在保持TFT处于OFF状态的同时开始电荷累积操作。 此后，TFT被导通以读出累加的信号电荷。

公开(公告)号：US20120199751A1

公开(公告)日：2012-08-09

申请号：US13361386

申请日：2012-01-30

申请人： Keita WATANABE

发明人： Keita WATANABE

IPC分类号： G01T1/24

CPC分类号： H04N5/32 ,  H04N5/232 ,  H04N5/353 ,  H04N5/374

摘要： An FPD has plural pixels arranged in two dimensions. The pixels include a short pixel directly connected to a signal line, and a comparative pixel connected to another signal line through a TFT. In irradiation detecting operation, a control section monitors a voltage signal from the short pixel. When the voltage signal is a predetermined threshold value or more, the control section detects the start of X-ray irradiation, and provisionally starts charge accumulation operation. Then, the control section calculates the difference in the voltage signal between the short pixel and the comparative pixel. When this difference is another threshold value or more, the detection of the start of X-ray irradiation is judged to be valid. When the difference is less than the threshold value, the detection is judged to be misdetection caused by shock noise. The charge accumulation operation is aborted, and the irradiation detecting operation is restarted.

摘要翻译： FPD具有排列成二维的多个像素。 像素包括直接连接到信号线的短像素，以及通过TFT连接到另一信号线的比较像素。 在照射检测操作中，控制部分监视来自短像素的电压信号。 当电压信号为预定阈值以上时，控制部检测X射线照射的开始，并暂时开始电荷累积动作。 然后，控制部分计算短像素和比较像素之间的电压信号的差。 当该差异为另一阈值以上时，判断为开始X射线照射的检测为有效。 当差小于阈值时，判断为由冲击噪声引起的误检。 电荷累积动作中止，照射检测动作重新开始。

公开(公告)号：US20120018641A1

公开(公告)日：2012-01-26

申请号：US13181533

申请日：2011-07-13

申请人： Keita WATANABE ,  Kouichi KITANO ,  Yasunori OHTA ,  Naoto IWAKIRI ,  Naoyuki NISHINO ,  Makoto SUGIZAKI

发明人： Keita WATANABE ,  Kouichi KITANO ,  Yasunori OHTA ,  Naoto IWAKIRI ,  Naoyuki NISHINO ,  Makoto SUGIZAKI

IPC分类号： G01J1/42

CPC分类号： A61B6/4283 ,  A61B6/4233 ,  A61B6/4423 ,  A61B6/4494 ,  A61B6/463 ,  A61B6/542 ,  A61B6/548 ,  A61B6/563

摘要： A radiation image capturing system includes: a radiation image capturing device that includes an irradiation detecting/image capturing mode in which a start of irradiation of radiation is detected and a radiation image is captured; a detection unit that detects whether a radiographer has completed positioning of a subject with respect to the radiation image capturing device or has completed image capturing preparation; and a control unit that controls the radiation image capturing device to transit to the irradiation detecting/image capturing mode, in a case in which it is detected by the detection unit that the radiographer has completed the positioning of the subject or has completed the image capturing preparation.

摘要翻译： 一种放射线图像捕获系统包括：放射线图像捕获装置，其包括其中检测到辐射的开始并捕获放射线图像的照射检测/图像捕获模式; 检测单元，其检测放射线照相技术人员是否完成了相对于所述放射线图像拍摄装置的被摄体的定位或者已经完成了图像拍摄准备; 以及控制单元，其控制所述放射线图像捕获装置转移到所述照射检测/图像拍摄模式，在所述检测单元检测到所述放射线照相技术人员已完成所述被摄体的定位或已经完成所述图像拍摄的情况下 制备。