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    • 6. 发明公开
    • Imaging apparatus and method
    • Bildgebende Vorrichtung und bildgebendes Verfahren
    • EP1211917A1
    • 2002-06-05
    • EP01309937.9
    • 2001-11-27
    • Marconi Medical Systems, Inc.
    • Malamud, Gabriel
    • H05G1/60A61B6/00H04N5/325
    • A61B6/4476A61B6/4028A61B6/4233H04N5/325H04N5/349H05G1/60
    • The origin of a cone or fan beam of B, γ, or x radiation is moved in a continuous path such as a circle or is stepped among a two-dimensional grid of preselected points. The cone beam of radiation passes through an imaging plane (44) in a patient (14) and is detected by a detector array (16) . A data collection circuit samples the detector array to generate radiation intensity sub-images. A circuit monitors the shifting of the focal spot and controls an image shifting circuit to shift physical coordinates of the sampled sub-image analogously. A sub-imaging combining circuit interleaves or otherwise combines spatially shifted sub-images. In one embodiment, the combined sub-images forms a higher resolution composite image representation. In another embodiment, a plurality of combined, spatially shifted sub-images are collected at angularly offset orientations around the subject and are reconstructed into a higher resolution composite image representation.
    • B,γ或X辐射的锥体或扇形束的原点在诸如圆圈的连续路径中移动,或者在预选点的二维网格中步进。 锥形辐射束通过患者(14)中的成像平面(44),并由检测器阵列(16)检测。 数据采集​​电路对检测器阵列进行采样以产生辐射强度子图像。 电路监视焦点的偏移并且控制图像移位电路以类似地移位采样的子图像的物理坐标。 子成像组合电路交织或以其他方式组合空间移位的子图像。 在一个实施例中,组合的子图像形成较高分辨率的合成图像表示。 在另一个实施例中,以围绕对象的角度偏移取向收集多个组合的空间移位子图像,并将其重建为更高分辨率的合成图像表示。
    • 8. 发明公开
    • Quadrature RF coil for MRI systems
    • 基于磁共振成像系统的射频正交线圈
    • EP1113286A3
    • 2002-05-02
    • EP00311406.3
    • 2000-12-19
    • Marconi Medical Systems, Inc.
    • Fujita, HiroyukiDemeester, Gordon D.
    • G01R33/34G01R33/341
    • G01R33/3678G01R33/34046
    • A quadrature RF coil assembly (50) is employed for quadrature excitation and/or reception in an open or vertical field magnetic resonance apparatus. The quadrature RF coil (50) includes a plurality of parallel rung elements (70, 72, 74, 76, 78) . A pair of electrical conductive end segments (80, 82) connect the plurality of rung elements. Capacitive elements (C V , C A ) interrupt a central rung element and the end segments. Preferably, the capacitive elements (C V , C A ) are arranged in a high-pass configuration such that the two highest resonant modes, an odd mode (90) and an even mode (92) , are tuned to have peak responsivity to a common imaging frequency. The odd mode (90) is responsive to magnetic fields which are normal to the coil (50) , while the even mode is responsive to magnetic fields which are parallel to the coil (50) and perpendicular to the main magnetic field. In one embodiment, the quadrature coil (50) is curved such that it is partially wrapped around a portion of a subject (100) with the rung elements (70, 72, 74, 76, 78) of the coil (50) parallel to the main magnetic field B 0 . The quadrature coil (50) provides improved B 1 field uniformity and greater tuning stability due to reduced localized electric field effects. The coil (50) provides greater accessibility for interventional procedures conducted in a vertical field or open magnetic resonance imaging system.