专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US4620313A Controlled cutoff frequency analog filter for CT scanners 失效
标题翻译：用于CT扫描仪的截止频率模拟滤波器
公开(公告)号：US4620313A
公开(公告)日：1986-10-28
申请号：US622522
申请日：1984-06-20
申请人： Joseph W. Erker
发明人： Joseph W. Erker
IPC分类号： G01N23/04 , A61B6/03 , G03B41/16
CPC分类号： A61B6/032 , Y10S378/901
摘要： A network for use in a fourth generation CT scanner for noise reduction. The network comprises an active low pass filter whose cutoff frequency is controlled by a scaled signal responsive to the angular velocity of the rotating radiation source of the scanner. In a preferred embodiment a raw signal is generated by an encoder that detects movement of the source. As the source speed changes either in response to an operator's selection of a different scan speed or to systemic variations in the scanner relative to expected performance, the filter's cutoff frequency will automatically change thereby assuring optimum performance regardless of scan speed.
摘要翻译：用于第四代CT扫描仪用于降噪的网络。网络包括有源低通滤波器，其截止频率由响应于扫描器的旋转辐射源的角速度的缩放信号控制。在优选实施例中，原始信号由检测源的移动的编码器产生。随着源速度响应于操作者对不同扫描速度的选择或扫描仪相对于预期性能的系统变化而变化，滤波器的截止频率将自动改变，从而确保最佳性能而不管扫描速度如何。

2. 发明授权

US4464776A Multiplexing signal processing channels in a CT scanner with rotating source 失效
标题翻译：在具有旋转源的CT扫描仪中复用信号处理通道
公开(公告)号：US4464776A
公开(公告)日：1984-08-07
申请号：US507187
申请日：1983-06-23
申请人： Joseph W. Erker
发明人： Joseph W. Erker
IPC分类号： A61B6/03 , A61B6/00 , G03B41/16
CPC分类号： A61B6/4275 , A61B6/032
摘要： A CT scanner having an outer circular array of stationary radiation detectors for an inner concentrically revolving source of radiation emitted in a fan pattern subtending a number of the detectors. Each grouping of 15 consecutive detectors is housed in a detector module, each one of which is provided with an electro-optical device which is arranged to normally deactivate the output of each of the detectors in the module. The detectors are arranged in exclusive groups of four nonconsecutive detectors each equiangularly disposed about the array connected in daisy chain fashion with the output of each of said nonconsecutive detector groups applied to a single signal cable defining a corresponding signal processing channel. There is also provided an opaque vane arranged for rotation in fixed relation to said revolving source of radiation for temporarily interrupting the deactivation caused by each of the electro-optical devices which correspond to those detectors in the array which at any time are being irradiated by said source.
摘要翻译：一种CT扫描器，具有外圆周阵列的固定辐射检测器，用于以对向多个检测器的扇形图案发射的内部同心旋转辐射源。将15个连续的检测器的每个组合容纳在检测器模块中，每个检测器模块中的每一个设置有电光装置，其被布置成正常地去激活模块中的每个检测器的输出。检测器被布置成四组不连续的检测器，每个检测器均匀地布置成围绕以菊花链方式连接的阵列，每个所述非连续检测器组的输出被施加到限定对应的信号处理通道的单个信号电缆。还提供了一种不透明的叶片，其布置成与所述旋转辐射源以固定的关系旋转，以暂时中断由与阵列中的这些检测器相对应的每个电光装置引起的去激活，其随时被所述资源。

3. 发明授权

US4278889A Current amplifier with automatic drift correction for tomographic scanners 失效
标题翻译：电流放大器，用于断层扫描仪的自动漂移校正
公开(公告)号：US4278889A
公开(公告)日：1981-07-14
申请号：US84777
申请日：1979-10-15
申请人： Joseph W. Erker
发明人： Joseph W. Erker
IPC分类号： A61B6/03 , G01T1/185 , H03F3/45 , G01T1/20
CPC分类号： H03F3/45479 , A61B6/032 , H03F2200/372
摘要： The current amplifier with automatic drift correction is designed for use in conjunction with computerized tomographic scanners or other apparatus. The amplifier comprises a differential amplifier with a first input connected to a photodiode or other source of current to be amplified. An integrating amplifier is connected between the differential amplifier output and a second differential amplifier input. The integrating amplifier has a time constant which is long compared with the period during which the diode current is to be amplified to provide automatic drift correction. A feedback loop connects the output of the differential amplifier with the first differential amplifier input. The feedback loop comprises a pair of matched transistors interconnected to form a current mirror. A first resistor connects the current mirror with ground. Current flow through these two resistors is summed to form the current flow received by the current mirror. The mirror current generated by the current mirror forms the amplifier output signal.
摘要翻译：具有自动漂移校正的电流放大器设计用于与计算机断层扫描仪或其他设备结合使用。放大器包括差分放大器，其具有连接到要放大的光电二极管或其他电流源的第一输入。积分放大器连接在差分放大器输出和第二差分放大器输入之间。积分放大器的时间常数与二极管电流放大的周期相比较长，以提供自动漂移校正。反馈回路将差分放大器的输出与第一个差分放大器输入相连。反馈回路包括互连以形成电流镜的一对匹配晶体管。第一个电阻将电流镜与地线相连。通过这两个电阻的电流流相加以形成电流镜所接收的电流。由电流镜产生的镜电流形成放大器输出信号。

4. 发明授权

US4253027A Tomographic scanner 失效
标题翻译：断层扫描仪
公开(公告)号：US4253027A
公开(公告)日：1981-02-24
申请号：US915316
申请日：1978-06-14
申请人： Samuel K. Taylor , Joseph W. Erker , Robert L. Carper
发明人： Samuel K. Taylor , Joseph W. Erker , Robert L. Carper
IPC分类号： G01N23/04 , A61B6/00 , A61B6/03 , H02G11/00
CPC分类号： A61B6/035 , A61B6/032 , A61B6/56
摘要： A tomographic scanner for subjecting a planar region of a patient to radiation and producing an image representing the planar region in which at least the source or beam of radiation is moved with a varying speed. In particular, in a traverse and rotate type scanner, a carriage carrying the radiation source and detector(s) is traversed relative to the patient with generally simple harmonic motion. Additionally, vibration is reduced by using a motor, which may include a flywheel, running at substantially constant speed to traverse the carriage. Vibration is further reduced by connecting the motor for rotating the carriage to the carriage through a flexible, e.g. chain, drive. Cable connections to the X-ray tube and other elements carried by the moveable carriage are simplified with a bicycle-chain like flexible cable support.
摘要翻译：一种断层扫描仪，用于使患者的平面区域辐射并产生表示至少所述源或辐射束以变化的速度移动的平面区域的图像。特别地，在横移和旋转型扫描仪中，携带放射源和检测器的托架相对于具有大致简单的谐波运动的患者穿过。此外，通过使用电动机来减少振动，该电动机可以包括以基本上恒定的速度运行以横越滑架的飞轮。通过连接马达来进一步降低振动，所述马达通过柔性的，例如，链，驱动。通过自行车链条（如柔性电缆支架）简化了与可移动托架携带的X射线管和其他元件的电缆连接。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式