公开(公告)号：US5836878A

公开(公告)日：1998-11-17

申请号：US909190

申请日：1997-08-11

申请人： Bryan J. Mock ,  William G. Irwin, Jr.

发明人： Bryan J. Mock ,  William G. Irwin, Jr.

IPC分类号： A61B5/053 ,  A61B6/04 ,  A61B19/00 ,  G01R33/28 ,  H61B5/055

CPC分类号： G01R33/34046 ,  A61B90/16 ,  A61B5/0531 ,  A61B6/0421

摘要： A method and apparatus is disclosed for immobilizing a patient's head within an MRI headcoil to avoid the use of imaging enhancements that compensate for patient movement. The apparatus includes a bite plate having a dental impression of the particular patient at one end, and at the other end, the bite plate is attached to a mounting bracket assembly. The mounting bracket assembly is rigidly attached to the MRI headcoil. The mounting bracket assembly includes a main bracket, an intermediary bracket, and a clamping plate. The bite plate is adjustably mounted to the intermediary bracket, which in turn is adjustably mounted to the main bracket to provide both approximate adjustments and precise adjustments, respectively. The clamping plate attaches the mounting bracket assembly to at least one rung of the headcoil. A patient adjustable retainer is provided for locking the bite plate to the intermediary bracket and providing a method of allowing the technician or the patient to perform the precise adjustments so that the patient is most comfortable during a lengthy MRI. Although the device is custom fitted for each patient, aside from the actual dental impression, the device is completely reusable.

摘要翻译： 公开了一种用于将患者头部固定在MRI头罩中的方法和装置，以避免使用补偿患者运动的成像增强。 该装置包括在一端具有特定患者的牙印的咬合板，另一端将咬合板附接到安装支架组件。 安装支架组件刚性地连接到MRI头卷。 安装支架组件包括主支架，中间支架和夹板。 咬合板可调节地安装到中间支架上，中间支架又可调节地安装到主支架上，以分别进行近似调整和精确调整。 夹紧板将安装支架组件附接到头卷的至少一个梯级。 提供了一种患者可调节保持器，用于将咬合板锁定到中间支架上并提供允许技术人员或患者进行精确调整以使患者在长时间MRI期间最舒适的方法。 虽然该设备是针对每个患者定制的，除了实际的牙齿印象，该设备是完全可重复使用的。

公开(公告)号：US5830143A

公开(公告)日：1998-11-03

申请号：US787181

申请日：1997-01-21

申请人： Charles M. Mistretta ,  Frank R. Korosec ,  Thomas M. Grist ,  Richard Frayne

发明人： Charles M. Mistretta ,  Frank R. Korosec ,  Thomas M. Grist ,  Richard Frayne

IPC分类号： G01R33/28 ,  A61B5/055 ,  G01R33/48 ,  G01R33/561 ,  G01R33/563 ,  G01R33/567 ,  H61B5/055

CPC分类号： G01R33/561 ,  G01R33/281 ,  G01R33/563 ,  G01R33/56308 ,  G01R33/567

摘要： A dynamic MRA study of a subject is performed using a 3D fast gradient-recalled echo pulse sequence that employs a non-selective RF excitation pulse. The frame rate of the resulting series of reconstructed images is increased by sampling a central region of k-space at a higher rate than the peripheral regions of k-space. The acquisition is gated using a cardiac trigger signal and the central region of k-space is acquired during diastole and the peripheral regions of k-space are acquired during systole. Image frames are reconstructed at each sampling of the central k-space region using the temporally nearest samples from the peripheral k-space regions. Two of the image frames are subtracted to form an MR angiogram.

摘要翻译： 使用采用非选择性RF激励脉冲的3D快速梯度回波脉冲序列来执行对象的动态MRA研究。 通过以比k空间的外围区域更高的速率对k空间的中心区域进行采样来增加所得到的一系列重构图像的帧速率。 使用心脏触发信号门控获取，并且在舒张期期间获取k空间的中心区域，并且在收缩期间获取k空间的周边区域。 使用来自外围k空间区域的时间上最近的采样，在中心k空间区域的每个采样处重构图像帧。 减去两个图像帧以形成MR血管造影图。