-
11.发明授权Display system for enhancing visualization of body structures during medical procedures 失效用于增强医疗过程中身体结构可视化的显示系统
公开(公告)号：US5526812A
公开(公告)日：1996-06-18
申请号：US549320
申请日：1995-10-27
CPC分类号： G06F3/013 , A61B90/36 , G06F19/3406 , A61B2090/371 , A61B2090/372 , G06F19/3481
摘要： An interactive display system superimposes images of internal structures on a semi-transparent screen through which a surgeon views a patient during a medical procedure. The superimposed image is derived from image data obtained with an imaging system. An invasive device is also tracked and displayed on the semi-transparent screen. A ray extending through the invasive device can also be displayed which shows the intended path of the invasive device. The image is registered with the surgeon's view of the patient and displayed in real-time during a medical procedure. This allows the surgeon to view internal and external structures, the relation between them, the proposed path of the invasive device, and adjust the procedure accordingly. A second embodiment employs stereoscopic viewing methods to provide three-dimensional representations of the radiological images superimposed on the semi-transparent screen through which the surgeon views the patient.
摘要翻译： 交互式显示系统将内部结构的图像叠加在半透明屏幕上，外科医生通过该半透明屏幕在医疗过程期间观察患者。 叠加的图像是从用成像系统获得的图像数据导出的。 还会在半透明屏幕上跟踪并显示有创设备。 还可以显示延伸穿过侵入性装置的射线，其显示侵入性装置的预期路径。 图像被注册到外科医生对病人的看法，并在医疗过程中实时显示。 这允许外科医生查看内部和外部结构，它们之间的关系，所建议的侵入性装置的路径，并相应地调整程序。 第二实施例采用立体观看方法来提供叠加在外科医生通过该半透明屏幕观察病人的半透明屏幕上的放射学图像的三维表示。
-
公开(公告)号：US5255680A
公开(公告)日：1993-10-26
申请号：US753567
申请日：1991-09-03
CPC分类号： A61B5/06 , A61B34/20 , A61B6/12 , A61B6/4476 , A61B2034/2051 , A61B2090/365 , A61B90/37
摘要： A tracking system which measures the position and orientation of invasive devices is used to automatically control the location of the X-ray imaging system gantry and/or patient table. The position and orientation of the invasive device, such as a catheter, are measured by detection of a radiofrequency field generated by the invasive device. The invasive device has at least one transmit coil attached near its end and is driven by a low power RF source to produce a dipole electromagnetic field that can be detected by an array of receive coils distributed around a region of interest. Automatic gantry placement facilitates medical diagnostic and therapeutic X-ray procedures and in some instances can reduce the number of personnel required to perform these procedures.
摘要翻译： 用于测量侵入性装置的位置和方向的跟踪系统用于自动控制X射线成像系统机架和/或患者台的位置。 侵入性装置（例如导管）的位置和取向通过检测由侵入性装置产生的射频场来测量。 侵入性装置具有附近的至少一个发射线圈，并且由低功率RF源驱动，以产生偶极电磁场，该偶极电磁场可通过分布在感兴趣区域周围的接收线圈阵列来检测。 自动龙门架放置有助于医疗诊断和治疗X射线程序，并且在某些情况下可以减少执行这些程序所需的人员数量。
-
13.发明申请TECHNIQUES FOR CORRECTING TEMPERATURE MEASUREMENT IN MAGNETIC RESONANCE THERMOMETRY 审中-公开用于校正磁共振热分析中温度测量的技术公开(公告)号：US20110046475A1
公开(公告)日：2011-02-24
申请号：US12546269
申请日：2009-08-24
IPC分类号： A61B5/055
CPC分类号： G01R33/4804 , G01R33/24 , G01R33/243 , G01R33/4814 , G01R33/565 , G01R33/56509 , G01R33/56563 , G01R33/58
摘要： Techniques for correcting temperature measurement in MR thermometry are disclosed. In particular, phase shifts that arise from factors other than temperature changes are detected, facilitating correction of temperature measurements.
摘要翻译： 公开了用于校正MR测温中的温度测量的技术。 特别地，检测出由温度变化以外的因素引起的相移，便于校正温度测量。
-
公开(公告)号：US5265610A
公开(公告)日：1993-11-30
申请号：US753566
申请日：1991-09-03
CPC分类号： A61B6/463 , A61B5/06 , A61B6/12 , H05G1/26 , A61B2034/2051
摘要： During an X-ray fluoroscopy procedure, the position and orientation of an invasive device, such as a catheter, are measured with radiofrequency fields. The invasive device has a transient coil attached near its end and is driven by a low power RF source to produce a dipole electromagnetic field that can be detected by an array of receive coils distributed around a region of interest of the subject. Multiple views of the instantaneous position of the invasive device are displayed by superposition of graphic symbols on multiple static X-ray images obtained at multiple view angles. Each view angle is displayed upon a different display means. The X-ray images are obtained only when deemed necessary by the operator to minimize X-ray dose. A single X-ray source and detector may be implemented since it is not necessary to obtain the X-ray images simultaneously.
摘要翻译： 在X射线透视程序期间，用射频场来测量诸如导管的侵入性装置的位置和取向。 侵入性装置具有靠近其端部附接的瞬态线圈，并且由低功率RF源驱动以产生偶极电磁场，该偶极电磁场可以通过分布在受试者的感兴趣区域周围的接收线圈阵列来检测。 通过在多个视角获得的多个静态X射线图像上叠加图形符号来显示侵入性设备的瞬时位置的多个视图。 每个视角都显示在不同的显示装置上。 仅当操作者认为必要时才能获得X射线图像以最小化X射线剂量。 可以实现单个X射线源和检测器，因为不需要同时获得X射线图像。
-
公开(公告)号：US5479925A
公开(公告)日：1996-01-02
申请号：US264283
申请日：1994-06-23
IPC分类号： A61B5/055 , A61B6/00 , G01R33/28 , G01R33/48 , G01R33/561 , G01R33/563 , G06T1/00 , H01F7/20
CPC分类号： A61B6/504 , A61B6/481 , G01R33/285 , G01R33/563 , G01R33/281 , G01R33/445 , G01R33/56308
摘要： A magnetic resonance (MR) active invasive device system employs a small, high-field polarizing magnet, and a large low-field magnetic resonance (MR) imaging magnet for the purpose of generating MR angiograms of selected blood vessels. A subject is positioned in a large low-field MR imaging magnet. A catheter in inserted into the patient at or near the root of a vessel tree desired to be imaged. A fluid, intended to be used as a contrast agent is first passed through the small high-field polarizing magnet, causing a great deal of net longitudinal magnetization to be produced in the fluid. The fluid is then introduced into the subject through the catheter. Radiofrequency (RF) pulses and magnetic field gradients are then applied to the patient as in conventional MR imaging. Since the fluid has a larger longitudinal magnetization, before the MR imaging sequence, the fluid produces a much larger MR response signal than other tissue resulting in the vessel tree being imaged with excellent contrast.
摘要翻译： 磁共振（MR）主动侵入性装置系统采用小型，高场极化磁体和大型低场磁共振（MR）成像磁体，用于产生选定血管的MR血管造影。 受试者位于大型低场MR成像磁体中。 插入患者的导管，该导管需要被成像的血管树根部或附近。 旨在用作造影剂的流体首先通过小型高场极化磁体，导致在流体中产生大量的净纵向磁化强度。 然后通过导管将流体引入受试者。 然后将射频（RF）脉冲和磁场梯度应用于患者，如在常规MR成像中。 由于流体具有较大的纵向磁化强度，在MR成像序列之前，流体产生比其它组织大得多的MR响应信号，导致血管树被成像，具有出色的对比度。
-
公开(公告)号：US5445150A
公开(公告)日：1995-08-29
申请号：US10720
申请日：1993-01-29
CPC分类号： G01V3/12 , A61B5/06 , A61B2560/0214 , A61B5/07
摘要： An invasive imaging system employs a self-contained RF transmitter attached to an invasive device which allows tracking of the invasive device within a subject without physical connections to a tracking/display system and without the use of ionizing rays. An imaging system obtains a medical diagnostic image of the subject. The self-contained RF transmitter is comprised of a power generator, a power conversion means such as an oscillator which converts the generated power to a radiofrequency (RF) signal, and a broadcasting means such as a tuned transmit coil for radiating the RF signal. The radiated RF signal is received by receive coils of a tracking/display means which calculates the location of the RF transmitter. The tracking/display means displays the medical diagnostic image on a monitor and superimposes a symbol on the image at a position corresponding to the calculated location of the RF transmitter. Prior to operation, the power generator may be energized inductively, photo-voltaically, or by direct contact with either an external power supply. The power generator may also be a charged battery sealed inside the RF transmitter. The RF transmitter may be implanted to track the motion of internal tissues.
摘要翻译： 侵入式成像系统采用连接到侵入性装置的独立的RF发射器，其允许跟踪受试者内的侵入性装置，而无需与跟踪/显示系统的物理连接，而不使用电离射线。 成像系统获得被检体的医学诊断图像。 独立的射频发射机包括功率发生器，诸如将所产生的功率转换为射频（RF）信号的振荡器的功率转换装置，以及用于辐射RF信号的诸如调谐发射线圈的广播装置。 辐射的RF信号由计算RF发射机的位置的跟踪/显示装置的接收线圈接收。 跟踪/显示装置在监视器上显示医疗诊断图像，并且在与RF计算机的位置相对应的位置处将图像叠加在图像上。 在操作之前，发电机可以感应地，光电地或通过与外部电源直接接触而被激励。 发电机也可以是密封在RF发射器内的充电电池。 可以植入RF发射器以跟踪内部组织的运动。
-
17.发明授权Magnetic resonance (MR) angiography using a toroidal polarizing magnet and a low-field imaging magnet 失效使用环形偏振磁体和低场成像磁体进行磁共振（MR）血管造影
公开(公告)号：US5609153A
公开(公告)日：1997-03-11
申请号：US534998
申请日：1995-09-27
IPC分类号： A61B5/055 , A61B6/00 , G01R33/28 , G01R33/48 , G01R33/561 , G01R33/563
CPC分类号： G01R33/563 , A61B5/055 , G01R33/285 , G01R33/445 , G01R33/56308
摘要： A magnetic resonance (MR) active invasive device system employs a small, high-field polarizing magnet having a toroidal geometry, and a large low-field magnetic resonance (MR) imaging magnet for the purpose of generating MR angiograms of selected blood vessels. A subject is positioned in a large low-field MR imaging magnet. A catheter is inserted into the patient at or near the root of a vessel tree to be imaged. A fluid, intended to be used as a contrast agent is first passed through the small high-field polarizing magnet, causing a great deal of net longitudinal magnetization to be produced in the fluid. The fluid is then introduced into the subject through the catheter. Radiofrequency (RF) pulses and magnetic field gradients are then applied to the patient as in conventional MR imaging. Since the fluid has a larger longitudinal magnetization, before the MR imaging sequence, the fluid produces a much larger MR response signal than other tissue, resulting in the vessel tree being imaged with excellent contrast.
摘要翻译： 磁共振（MR）有源侵入性装置系统采用具有环形几何形状的小型高场极化磁体和大型低场磁共振（MR）成像磁体，用于产生选定血管的MR血管造影。 受试者位于大型低场MR成像磁体中。 在要成像的血管树的根部处或附近将导管插入患者体内。 旨在用作造影剂的流体首先通过小型高场极化磁体，导致在流体中产生大量的净纵向磁化强度。 然后通过导管将流体引入受试者。 然后将射频（RF）脉冲和磁场梯度应用于患者，如在常规MR成像中。 由于流体具有较大的纵向磁化强度，在MR成像序列之前，流体产生比其他组织大得多的MR响应信号，导致血管树被成像，具有优异的对比度。
-
18.发明授权Method for the prevention of registration artifacts due to motion in magnetic resonance images 失效用于防止由于磁共振图像中的运动引起的对准伪影的方法
公开(公告)号：US5541512A
公开(公告)日：1996-07-30
申请号：US313957
申请日：1994-09-28
IPC分类号： G01R33/567 , G01V3/00 , G01V3/14
CPC分类号： G01R33/56509
摘要： A magnetic resonance system employs a sequence of radio frequency pulses and magnetic field gradients to generate a flow-compensated image of a selected portion of a sample. Flow-compensation is performed with an oscillating readout gradient waveform which is comprised of two components. The first component is a constant amplitude gradient waveform whose amplitude is determined by the desired field-of-view and the bandwidth of the imaging system. The second component is an oscillating waveform whose amplitude, frequency and phase are chosen to obtain the desired degree of flow-compensation. The frequency of the oscillating waveform is typically chosen to match the sampling frequency of the imaging system. In effect, each acquired data point is preceded by the application of a bi-polar magnetic field gradient pulse which causes a phase shift in the acquired signal which is proportional to nuclear spin velocity. The amplitude is typically chosen to cause an incremental phase shift which when repeatedly added to the acquired MR response signal at the sampling rate causes a frequency modulation. This frequency modulation, in turn, induces a spatial displacement of signal intensity in the readout dimension which corresponds to the displacement of spin magnetization during the interval between the phase-encoding and frequency-encoding.
摘要翻译： 磁共振系统采用一系列射频脉冲和磁场梯度来产生样本的所选部分的流量补偿图像。 使用由两个部件组成的振荡读出梯度波形执行流量补偿。 第一分量是恒幅幅度梯度波形，其幅度由所需的视场和成像系统的带宽决定。 第二个组件是振幅波形，其振幅，频率和相位被选择以获得所需的流量补偿程度。 通常选择振荡波形的频率以匹配成像系统的采样频率。 实际上，每个获取的数据点之前是施加双极磁场梯度脉冲，其引起所获取的信号中与核旋转速度成比例的相移。 通常选择幅度以引起增量相移，当以采样率重复地添加到所获取的MR响应信号时，会产生频率调制。 这种频率调制又引起了在相位编码和频率编码之间的间隔期间对应于自旋磁化的位移的读出维度中的信号强度的空间位移。
-
公开(公告)号：US5443066A
公开(公告)日：1995-08-22
申请号：US299976
申请日：1994-09-02
CPC分类号： G01V3/12 , A61B5/06 , A61B2560/0214 , A61B5/07
摘要： An invasive imaging system employs a self-contained RF transmitter attached to an invasive device which allows tracking of the invasive device within a subject without physical connections to a tracking/display system and without the use of ionizing rays. An imaging system obtains a medical diagnostic image of the subject. The self-contained RF transmitter is comprised of a power generator means, a power conversion means such as an oscillator which converts the generated power to a radiofrequency (RF) signal, and a broadcasting means such as a tuned transmit coil for radiating the RF signal. The radiated RF signal is received by receive coils of a tracing/display means which calculates the location of the RF transmitter. The tracking/display means displays the medical diagnostic image on a monitor and superimposes a symbol on the image at a position corresponding to the calculated location of the RF transmitter. Prior to operation, the power generator may be energized inductively, photo-voltaically, or by direct contact with an external power supply. The power generator means may also be a charged battery sealed inside the RF transmitter. The RF transmitter may be implanted to track the motion of internal tissues.
摘要翻译： 侵入式成像系统采用连接到侵入性装置的独立的RF发射器，其允许跟踪受试者内的侵入性装置，而无需与跟踪/显示系统的物理连接，而不使用电离射线。 成像系统获得被检体的医学诊断图像。 独立的射频发射机包括发电机装置，功率转换装置，例如将所产生的功率转换成射频（RF）信号的振荡器，以及诸如用于辐射RF信号的调谐发射线圈的广播装置 。 辐射的RF信号由计算RF发射机的位置的跟踪/显示装置的接收线圈接收。 跟踪/显示装置在监视器上显示医疗诊断图像，并且在与RF计算机的位置相对应的位置处将图像叠加在图像上。 在操作之前，发电机可以感应地，光电地或通过与外部电源直接接触而被激励。 发电装置也可以是密封在RF发射器内部的充电电池。 可以植入RF发射器以跟踪内部组织的运动。
-
20.发明授权Inductively coupled RF tracking system for use in invasive imaging of a living body 失效电感耦合射频跟踪系统，用于生物体的侵入性成像
公开(公告)号：US5437277A
公开(公告)日：1995-08-01
申请号：US194979
申请日：1994-02-14
CPC分类号： A61B5/06 , A61B17/00234 , A61B2090/3954 , Y10S439/909
摘要： RF tracking system employs a RF invasive device coupled to surgical tracking equipment for tracking the invasive device. An inductive coupling permits the device to be quickly coupled to, and decoupled from, the equipment. The coupling comprises an inducting coil which transmits a signal from the surgical tracking equipment to a communicating coil in the invasive device. The signal received by the communicating coil passes along leads to a tracked coil in a distal end of the invasive device. The tracked coil transmits the signal as RF energy which is received by the surgical tracking equipment which superimposes the position of the distal end of the invasive device on an X-ray image and displays it on a monitor A sterile shield is employed as a sterile barrier between the inducting coil and the equipment end of the invasive device to prevent contamination of the invasive device by the inducting coil. The cross-section of the invasive device at its equipment end can be made identical to the rest of the invasive device to permit other invasive devices to pass completely over the invasive device.
摘要翻译： RF跟踪系统采用耦合到外科跟踪设备的RF入侵设备来跟踪侵入性设备。 电感耦合允许设备快速耦合到设备并与设备解耦。 联接器包括将来自手术跟踪设备的信号传送到侵入性装置中的连通线圈的感应线圈。 由通信线圈接收的信号沿着引线传送到侵入性装置的远端中的跟踪线圈。 被跟踪的线圈将该信号作为RF能量传送，该能量由外科追踪设备接收，其将侵入性装置的远端的位置叠加在X射线图像上并将其显示在监视器上无菌屏蔽被用作无菌屏障 在感应线圈和入侵设备的设备端之间，以防止感应线圈对侵入性装置的污染。 侵入性装置在其设备端的横截面可以与侵入性装置的其余部分相同，以允许其他侵入性装置完全穿过侵入性装置。
-
-
-
-
-
-
-
-
-
搜索结果
26 条记录 (耗时 0.022 秒)
