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    • 5. 发明授权
    • NMR neck coil with passive decoupling
    • NMR颈线圈,带有被动去耦
    • US5221902A
    • 1993-06-22
    • US895481
    • 1992-06-08
    • Randall W. JonesThomas E. Schubert
    • Randall W. JonesThomas E. Schubert
    • G01R33/34G01R33/36
    • G01R33/34084G01R33/34061G01R33/34069G01R33/36G01R33/3642G01R33/3657
    • A whole volume neck coil for MRI includes an anterior and posterior saddle coil, the latter attached to a base. The anterior coil is held in an open framework, hinged against an extension tower attached to the base. The hinge axis is angled to the medial axis to provide greater entry area for the patient's head and shoulders. The extension tower also provides adjustment of the anterior coil toward and away from the base by means of a sliding carriage attached to the extension tower. The coils are passively decoupled from the RF excitation field by means of back-to-back diodes which insert a "pole" forming network into the coils. A method of calculating the values of the network components is taught that accounts for significant diode junction capacitance.
    • 用于MRI的整体体积颈圈包括前鞍线圈和后鞍线圈,其后者连接到基座。 前线圈保持在开放的框架中,铰接到附接到基座的延伸塔上。 铰链轴线与中间轴成一定角度,为患者的头部和肩部提供更大的进入面积。 延伸塔还通过附接到延伸塔的滑动滑架来提供前部线圈朝向和远离基座的调节。 通过背对背二极管将线圈与RF激励场无源解耦,将二极管插入到线圈中。 教导了一种计算网络组件的值的方法,其考虑了二极管结电容的显着性。
    • 6. 发明授权
    • NMR neck coil with passive decoupling
    • NMR颈线圈,带有被动去耦
    • US5166618A
    • 1992-11-24
    • US601552
    • 1990-10-22
    • Randall W. JonesThomas E. Schubert
    • Randall W. JonesThomas E. Schubert
    • G01R33/34G01R33/36
    • G01R33/34084G01R33/34061G01R33/34069G01R33/34007G01R33/3657
    • A whole volume neck coil for MRI includes an anterior and posterior saddle coil, the latter attached to a base. The anterior coil is held in an open framework, hinged against an extension tower attached to the base. The hinge axis is angled to the medial axis to provide greater entry area for the patient's head and shoulders. The extension tower also provides adjustment of the anterior coil toward and away from the base by means of a sliding carriage attached to the extension tower. The coils are passively decoupled from the RF excitation field by means of back-to-back diodes which insert a "pole" forming network into the coils. A method of calculating the values of the network components is taught that accounts for significant diode junction capacitance.
    • 用于MRI的整体体积颈圈包括前鞍线圈和后鞍线圈,其后者连接到基座。 前线圈保持在开放的框架中,铰接到附接到基座的延伸塔上。 铰链轴线与中间轴成一定角度,为患者的头部和肩部提供更大的进入面积。 延伸塔还通过附接到延伸塔的滑动滑架来提供前部线圈朝向和远离基座的调节。 通过背对背二极管将线圈与RF激励场无源解耦,将二极管插入到线圈中。 教导了一种计算网络组件的值的方法,其考虑了二极管结电容的显着性。
    • 7. 发明授权
    • Thermally compensated x-ray tube bearings
    • 热补偿x射线管轴承
    • US4569070A
    • 1986-02-04
    • US533769
    • 1983-09-19
    • Thomas E. SchubertJohn C. Clark
    • Thomas E. SchubertJohn C. Clark
    • F16C25/08H01J35/10H01J35/24H01J35/26H01J35/28
    • H01J35/101
    • The rotor that carries the target in a rotating anode x-ray tube is carried on a shaft that is journaled in axially spaced apart ball bearings. The outer and inner races of the bearings have curved grooves presented toward each other and there are a plurality of balls in the grooves. A preloaded spring is interposed between corresponding races of the bearings for applying oppositely directed axial forces to them. The grooves are so shaped and the clearance between the balls and groove surfaces is such that when the axial force is applied, one race shifts axially relative to the other in which case each ball has two points of contact, one point at which the ball contacts the surface of the groove in the outer race on one side of a plane transverse to the shaft axis and another point where the ball contacts the surface of the groove in the inner race on the other side of the plane. The chosen axial preload force is in a range of forces that compels many balls to share the radial load of the rotor and target to minimize contact stress on each ball and the races and the preload spring force range begins just above the force that would result in one or a few of the balls carrying the radial load.
    • 在旋转的阳极x射线管中承载目标的转子被承载在轴向间隔开的球轴承中的轴上。 轴承的外圈和内圈具有朝向彼此呈现的弯曲槽,并且在凹槽中存在多个滚珠。 预先加载的弹簧介于相应的轴承座之间,以向它们施加相反的轴向力。 凹槽是这样的形状,并且球和凹槽表面之间的间隙使得当施加轴向力时,一个圆圈相对于另一个轴向轴向移动,在这种情况下,每个球具有两个接触点,球接触的一个点 外圈中的槽的表面在横向于轴线的一个平面的一侧上,另一个点与球体在该平面的另一侧的内圈中的表面接触。 所选择的轴向预紧力是在一定范围内的力,其强制许多球共享转子和目标的径向载荷,以使每个球和座圈上的接触应力最小化,并且预载弹簧力范围刚刚高于将产生的力 一个或几个承载径向载荷的球。