公开(公告)号：US4872190A

公开(公告)日：1989-10-03

申请号：US298339

申请日：1989-01-13

申请人： Mark Stojkov ,  Patrick M. Flanagan ,  Victor Hrdlicka ,  John Geither ,  Dennis Everett

发明人： Mark Stojkov ,  Patrick M. Flanagan ,  Victor Hrdlicka ,  John Geither ,  Dennis Everett

IPC分类号： G03B42/02

CPC分类号： G03B42/025

摘要： A system and method is disclosed for minimizing residual vibration of a radiographic system due to rapid movement of a radiographic film cassette between a park and expose position. The cassette is moved by a servo system including a servo motor which is responsive to a voltage input waveform to drive the cassette. A waveform is chosen for the voltage input such that no impulse derivatives appear until the waveform has been differentiated at least three times. The primary natural resonant frequency of the system is determined and noted. The duration of the selected input waveform is adjusted such that the frequency spectrum of the adjusted input waveform defines a relative null which approximately coincides with the primary resonant frequency. The amplitude of the voltage input waveform is then further adjusted as a function of the distance to be traveled by the cassette between the park and expose positions. The servo system can optionally be operated over a portion of the cassette transit in a closed loop fashion. In a mechanical embodiment, sinusoidal cassette acceleration can be effected by the use of a mechanical drive linkage coupled between a motor and the cassette, the drive linkage employing a cycloidal cam and associated cam follower to govern the profile of cassette movement.

摘要翻译： 公开了一种用于使放射线照相系统的残余振动由于放映照相胶片暗盒在公园和曝光位置之间的快速移动而被最小化的系统和方法。 盒式磁带由包括伺服电机的伺服系统移动，伺服电机响应于电压输入波形来驱动盒。 为电压输入选择一个波形，使波形不会出现，直到波形至少三分之一为止。 确定并记录系统的主要自然共振频率。 调整所选择的输入波形的持续时间，使得经调整的输入波形的频谱定义与初级谐振频率大致一致的相对零点。 电压输入波形的幅度随着进一步的调整，作为由公园和曝光位置之间的磁带行进的距离的函数。 伺服系统可以可选地以闭环方式在盒的一部分上运行。 在机械实施例中，可以通过使用耦合在电动机和盒之间的机械驱动联动装置来实现正弦盒式加速，驱动联动装置采用摆线凸轮和相关联的凸轮从动件来控制磁带盒运动的轮廓。

公开(公告)号：US20070030004A1

公开(公告)日：2007-02-08

申请号：US10558768

申请日：2004-05-19

申请人： William Amor ,  Dennis Everett ,  Jerome Alden ,  Robert Henderson ,  Terrence Doyle ,  Ronald Sharpless ,  Gerardus Mulder ,  Gerardus Peeren

发明人： William Amor ,  Dennis Everett ,  Jerome Alden ,  Robert Henderson ,  Terrence Doyle ,  Ronald Sharpless ,  Gerardus Mulder ,  Gerardus Peeren

IPC分类号： G01V3/00

CPC分类号： G01R33/3873

摘要： A magnetic resonance imaging scanner includes a generally cylindrical main magnet assembly (10) that defines a cylinder axis (16). A first set of shims (60) are rigidly positioned inside the magnet assembly (10) at about a first distance (d1) relative to the cylinder axis (16). A second set of shims (62) are rigidly positioned inside the main magnet assembly (10) at about a second distance (d2) relative to the cylinder axis (16). The second distance (d2) is different from the first distance (d1). A generally cylindrical radio frequency coil (26) is arranged inside the main magnet assembly (10) at about a third distance (d3) relative to the cylinder axis (16). A plurality of gradient coils (20) are arranged inside the main magnet assembly (10) at about a fourth distance (d4) relative to the cylinder axis (16).

摘要翻译： 磁共振成像扫描仪包括限定气缸轴线（16）的大致圆柱形的主磁体组件（10）。 第一组垫片（60）相对于气缸轴线（16）以大约第一距离（d 1）刚性地定位在磁体组件（10）的内部。 第二组垫片（62）相对于气缸轴线（16）以大约第二距离（d 2）刚性地定位在主磁体组件（10）的内部。 第二距离（d 2）与第一距离（d 1）不同。 大致圆柱形的射频线圈（26）相对于气缸轴线（16）以大约第三距离（d 3）布置在主磁体组件（10）的内部。 多个梯度线圈（20）相对于气缸轴线（16）以大约第四距离（d 4）布置在主磁体组件（10）的内部。

公开(公告)号：US20060167356A1

公开(公告)日：2006-07-27

申请号：US10536466

申请日：2003-11-19

申请人： Dennis Everett ,  Timothy Bielawski ,  Patrick Cumpson

发明人： Dennis Everett ,  Timothy Bielawski ,  Patrick Cumpson

IPC分类号： A61B5/05 ,  A47B13/00

CPC分类号： A61B6/0457 ,  A61B5/0555

摘要： A docking assembly connected to a movable couch (30) docks the couch with an imaging apparatus (10). Couch alignment surfaces (72) mate with corresponding alignment surfaces (64) of a connecting region (50) of the imaging apparatus (10) to define a docked position of the movable couch (30) with respect to the imaging apparatus. A docking sensor (160) detects the movable couch (30) approaching the docked position. A latch (82) mates with the connecting region (50) of the imaging to apparatus (10). An actuator (130, 154) cooperates with the latch (82) to bias the movable couch (30) into the docked position responsive to a signal produced by the docking sensor (160).

摘要翻译： 连接到可移动沙发（30）的对接组件与成像设备（10）对接在沙发上。 沙发对准表面（72）与成像设备（10）的连接区域（50）的对应对准表面（64）配合，以限定可移动沙发（30）相对于成像设备的对接位置。 对接传感器（160）检测接近对接位置的可动沙发（30）。 闩锁（82）与成像装置（10）的连接区域（50）配合。 致动器（130,154）与闩锁（82）配合，以响应于由对接传感器（160）产生的信号将可移动的沙发（30）偏压到对接的位置。

公开(公告)号：US4926455A

公开(公告)日：1990-05-15

申请号：US339891

申请日：1989-04-17

申请人： Mark Stojkov ,  Patrick M. Flanagan ,  Victor Hrdlicka ,  John Geither ,  Dennis Everett

发明人： Mark Stojkov ,  Patrick M. Flanagan ,  Victor Hrdlicka ,  John Geither ,  Dennis Everett

IPC分类号： G03B42/02

CPC分类号： G03B42/025

摘要： A system and method is disclosed for minimizing residual vibration of a radiographic system due to rapid movement of a radiographic film cassette between a park and expose position. The cassette is moved by a servo system including a servo motor which is responsive to a voltage input waveform to drive the cassette. A waveform is chosen for the voltage input such that no inpulse derivatives appear until the waveform has been diferentiated at least three times. The primary natural resonant frequency of the system is determined and noted. The duration of the selected input waveform is adjusted such that the frequency spectrum of the adjusted input waveform defines a relative null which approximately coincides with the primary resonant frequency. The amplitude of the voltage input waveform is then further adjusted as a function of the distance to be traveled by the cassette between the park and expose positions. The servo system can optionally be operated over a portion of the cassette transit in a closed loop fashion. In a mechanical embodiment, sinusoidal cassette acceleration can be effected by the use of a mechanical drive linkage coupled between a motor and the cassette, the drive linkage employing a cycloidal cam and associated cam follower to govern the profile of cassette movement.

摘要翻译： 公开了一种用于使放射线照相系统的残余振动由于放映照相胶片暗盒在公园和曝光位置之间的快速移动而被最小化的系统和方法。 盒式磁带由包括伺服电机的伺服系统移动，伺服电机响应于电压输入波形来驱动盒。 为电压输入选择一个波形，使波形不会出现至少三次，直到波形出现。 确定并记录系统的主要自然共振频率。 调整所选择的输入波形的持续时间，使得经调整的输入波形的频谱定义与初级谐振频率大致一致的相对零点。 电压输入波形的幅度随着进一步的调整，作为由公园和曝光位置之间的磁带行进的距离的函数。 伺服系统可以可选地以闭环方式在盒的一部分上运行。 在机械实施例中，可以通过使用耦合在电动机和盒之间的机械驱动联动装置来实现正弦盒式加速，驱动联动装置采用摆线凸轮和相关联的凸轮从动件来控制磁带盒运动的轮廓。

公开(公告)号：US4380819A

公开(公告)日：1983-04-19

申请号：US209739

申请日：1980-11-24

申请人： Dennis Everett ,  Vjekoslav Jukic

发明人： Dennis Everett ,  Vjekoslav Jukic

IPC分类号： G03B42/02 ,  G21F5/04

CPC分类号： G03B42/025

摘要： A masking apparatus and palpitator cone drive system for an X-ray spotfilming device. The masking apparatus comprises first and second pairs of shutter-like members mounted for reciprocating movement in two mutually orthogonal directions. Each mask member of the second pair includes first and second relatively moveable elements that operate in a telescope-like manner. A drive system including a reversible motor and a feedback potentiometer actuates the elements at first and second speeds so that the elements reach their retracted and extended positions simultaneously. The cone drive system includes a drive motor, a drive belt and drive assembly for driving the cone between retracted and operative positions. A cone lock is engageable with a keeper located at a cone-advanced position of the drive assembly and is released by the drive belt whenever the drive motor is energized in the cone-retracting direction.

摘要翻译： 一种用于X射线斑点成像装置的掩蔽装置和触发器锥形驱动系统。 掩蔽装置包括安装成用于在两个相互正交的方向上往复运动的第一和第二对挡板状构件。 第二对的每个掩模构件包括以类似望远镜的方式操作的第一和第二可相对移动的元件。 包括可逆电动机和反馈电位器的驱动系统以第一速度和第二速度致动元件，使得元件同时到达其缩回位置和延伸位置。 锥形驱动系统包括驱动马达，驱动带和用于在缩回和操作位置之间驱动锥体的驱动组件。 锥形锁可与位于驱动组件的锥形进给位置处的保持器接合，并且每当驱动马达沿锥形回缩方向通电时由驱动带释放。