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公开(公告)号：EP1005257A3
公开(公告)日：2003-06-11
申请号：EP99308855.8
申请日：1999-11-08
发明人： Morgan, Hugh T.
CPC分类号： A61B6/032 , A61B6/027 , A61B6/4014 , A61B6/4021 , A61B6/4085 , H05G1/34
摘要： A CT scanner includes a stationary gantry (A) defining an examination region (12) and a rotating gantry (C) which rotates about the examination region. Multiple fan beam generators (B), each capable of producing a beam of radiation directed through the examination region, are mounted to the rotating gantry. The radiation beams are collimated (42) into a plurality of parallel thin fan shaped beams that are projected through the examination region. X-rays are detected by at least an arc of x-ray detectors or a plurality of parallel rings of detectors (14 1 , 14 2 ,...14 n ). The detectors generate signals indicative of the radiation received which are processed by a reconstruction processor (18) into a volumetric image representation for display on a monitor (20). In one embodiment, the signals are reconstructed into a series of spaced parallel slices. The object is indexed and additional slices are collected and reconstructed between previously reconstructed slices. In another embodiment, the region of interest moves such that each beam traverses a spiral path spanning one of a plurality of contiguous slabs. The multiple fan beam generators may be contained within a single elongated x-ray tube. Alternatively, the multiple fan beams can be generated by a plurality of angularly displaced x-ray tubes.
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2.发明公开Gradient coils for magnetic resonance imaging 审中-公开Gradientenspulenfürdie bildgebende magnetische Resonanz
公开(公告)号：EP1102080A3
公开(公告)日：2003-06-04
申请号：EP00309902.5
申请日：2000-11-08
IPC分类号： G01R33/385
CPC分类号： G01R33/385
摘要： A gradient coil assembly (22) generates substantially linear gradient magnetic fields through an examination region (14) . The gradient coil assembly (22) includes a pair of primary gradient coil sets (22a, 22b) and a pair of shield coil sets (23a, 23b) which are disposed in an overlapping relationship. One gradient coil set is displaced relative to the other gradient coil set such that the mutual inductance between the two is minimized. Preferably, the coil sets (22a, 22b, 23a, 23b) are asymmetric, such that the sweet spot of each coil is displaced from the geometric centre of each coil. One primary gradient coil set (22a) is a high efficiency, high switching speed coil to enhance performance of ultrafast magnetic resonance sequences, while the second primary gradient coil set (22b) is a low efficiency coil which generates a high quality gradient magnetic field, but with slower switching speeds. By displacing one gradient coil set relative to the other, mutual inductance is minimized, which maximizes peak gradient, rise time, and slew rate, while dB/dt levels are minimized. Arranging asymmetric gradient coil sets in an overlapping, phased array reduces coil resistance, which increases duty cycle and reduces heat dissipation to eliminate extra costs for a cooling system.
摘要翻译： 梯度线圈组件（22）通过检查区域（14）产生基本线性的梯度磁场。 梯度线圈组件（22）包括一对主梯度线圈组（22a，22b）和一对以重叠关系布置的屏蔽线圈组（23a，23b）。 一个梯度线圈组相对于另一个梯度线圈组移位，使得两者之间的互感最小化。 优选地，线圈组（22a，22b，23a，23b）是不对称的，使得每个线圈的最佳点从每个线圈的几何中心位移。 一个主梯度线圈组（22a）是高效率的高切换速度线圈，以提高超快磁共振序列的性能，而第二主梯度线圈组（22b）是产生高质量梯度磁场的低效率线圈， 但开关速度较慢。 通过相对于另一个移位一个梯度线圈组，互感被最小化，这使峰值梯度，上升时间和转换速率最大化，而dB / dt电平最小化。 在重叠的相控阵列中布置不对称梯度线圈组可减少线圈电阻，从而增加占空比并减少散热，以消除冷却系统的额外成本。
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公开(公告)号：EP1085337A3
公开(公告)日：2003-05-28
申请号：EP00307564.5
申请日：2000-09-01
CPC分类号： G01R33/34046 , G01R33/3628
摘要： A magnetic resonance apparatus includes a main magnetic field source (12) for providing a magnetic field (B 0 ) along a main field axis. A transmitter (34) and transmit coils (30, 32) excite a nuclei of an object to resonate. The resonating nuclei generate magnetic resonance signals detected by a volume coil (50) including a pair of end rings (70, 72) separated along a coil axis (Y). The end rings (70, 72) are electrically interconnected by a plurality of rungs (74) disposed about the rings. A conductive loop (80) is concentrically disposed between and inductively coupled to the end rings. The loop includes an electrical conductor (82) preferably surrounding the rungs (74), and positioned parallel to the end rings (70, 72). A capacitive element (84), in electrical communication with the conductor (82), is selected or adjusted to tune the loop (80) to signals at a selected frequency. Moreover, the loop (80) is slidably positionable along the coil axis (Y) and has an adjustable capacitor (84) to match or tune the loop to signals at the selected frequency.
摘要翻译： 磁共振装置包括用于沿主场轴提供磁场（B0）的主磁场源（12）。 发射器（34）和发射线圈（30,32）激发物体的核以产生谐振。 谐振核产生由包括沿着线圈轴线（Y）分离的一对端环（70,72）的体积线圈（50）检测的磁共振信号。 端环（70,72）通过围绕环设置的多个梯级（74）电互连。 导电回路（80）同心地设置在端环之间并感应耦合到端环。 环路包括优选围绕梯级（74）并且平行于端环（70,72）定位的电导体（82）。 选择或调节与导体（82）电连通的电容元件（84），以将环路（80）调谐到选定频率的信号。 此外，环路（80）可沿着线圈轴线（Y）可滑动定位，并且具有可调电容器（84），以将环路与所选频率的信号相匹配或调谐。
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公开(公告)号：EP1008865A3
公开(公告)日：2003-03-05
申请号：EP99309824.3
申请日：1999-12-07
IPC分类号： G01T1/164
CPC分类号： G01T1/1648
摘要： A radiation detector includes slit collimator. A radiation detector receives radiation which has been received in each of the slits. The aspect ratio of the detector is approximately three, and each semiconductor radiation detector (106) has a transverse dimension (C y ) which is less than that of its respective slit (W y ). A reconstruction processor generates an image indicative of the radiation received by the detectors. The detector may be rotated about a fixed axis (109). Alternately, the detector may be translated in coordination with its rotation to provide a substantially square field of view.
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公开(公告)号：EP1132757A3
公开(公告)日：2003-01-22
申请号：EP01302242.1
申请日：2001-03-12
发明人： Gagnon, Daniel , Tung, Chi-Hua
CPC分类号： G01T1/1615 , G01T1/1648
摘要： An asymmetric sampling scheme for use with a nuclear medicine gamma camera facilitates collection of a full set of higher resolution emission data and lower resolution transmission data with one complete 360° rotation of the gantry. The gantry contains a plurality of radiation detectors and at least one adjustably mounted radiation source. During a scan, the gantry is incrementally rotated about a subject receiving aperture by a predetermined step size throughout a first 180° of a rotation (P 1 , ..., P 6 ). The gantry is then rotated about the subject receiving aperture by one-half the predetermined step size (P 7 or P 8 ). The gantry is then incrementally rotated about the subject receiving aperture by the predetermined step size throughout the remaining 180° of the scan (P 8 , ..., P 12 ). Emission data collected during the second half of the scan (P 8 , ..., P 12 ) is interleaved into the data from the first half of the scan. Such sampling reduces overall scan time by cutting the number of steps approximately in half, therefore, eliminating 50% of the dead time while the gantry rotates and comes to rest.
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6.发明公开Magnetic resonance imaging using vaginal probe 审中-公开Bildgebende magnetische Resonanz mit Verwendung einer Vaginalsonde
公开(公告)号：EP1255119A2
公开(公告)日：2002-11-06
申请号：EP02251217.2
申请日：2002-02-22
IPC分类号： G01R33/28
CPC分类号： G01R33/285 , A61B5/055
摘要： An MRI apparatus includes a local endovaginal probe ( 30 ) for receiving magnetic resonance in a study of the endopelvic fascia surrounding the female urethra. The probe ( 30 ) includes a shaft portion ( 62 ) an insert portion ( 60 ), the insert portion to be inserted into the vaginal cavity of a female subject. The insert portion (60) , in order to have maximum efficiency in imaging the endopelvic fascia, is designed to specific dimensions to achieve the optimum balance between image quality and patient comfort. In an imaging sequence, a main magnet assembly produces a main magnetic field through an imaging region. A whole-body RF coil excites and manipulates magnetic resonance in the vicinity of the vaginal cavity. The probe (30) detects the magnetic resonance, which is received and demodulated. The received magnetic resonance is then reconstructed into an image representation of the tissue surrounding the vaginal cavity of the subject.
摘要翻译： MRI装置包括用于在研究围绕女性尿道的内皮筋膜的研究中接收磁共振的局部阴道内探针（30）。 探针（30）包括轴部（62），插入部分（60），插入部分插入女性受试者的阴道腔内。 插入部分（60）为了在内皮筋膜成像方面具有最大的效率，被设计为特定的尺寸以实现图像质量和患者舒适度之间的最佳平衡。 在成像序列中，主磁体组件通过成像区产生主磁场。 全身RF线圈激发并操纵阴道腔附近的磁共振。 探头（30）检测被接收和解调的磁共振。 然后将接收到的磁共振重构成围绕对象阴道腔的组织的图像表示。
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公开(公告)号：EP0753758B1
公开(公告)日：2002-11-06
申请号：EP96304991.1
申请日：1996-07-05
IPC分类号： G01R33/34
CPC分类号： G01R33/3415 , G01R33/34007 , G01R33/34084 , G01R33/341
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公开(公告)号：EP1182740A3
公开(公告)日：2002-10-23
申请号：EP01306396.1
申请日：2001-07-26
CPC分类号： H01R13/5202 , H01R4/54 , H01R13/746
摘要： A connection device (70) provides electrical connection between a stator motor (50) of an x-ray tube and a stator cord (56). The connection device is connected with the x-ray tube housing (30) by threading a threaded portion into a corresponding threaded aperture in the housing to create a leak-tight seal. The threaded portion is rigidly connected with a connecting portion, such as a bayonet socket, which receives a corresponding fitting (102) of the stator cord. An electrical conduction path, hermetically sealed in the connecting device, provides electrical connection between the socket and the interior of the housing. The connection device allows the stator cord to be quickly connected or disconnected from the housing yet provides a seal which resists leakage of cooling oil from the housing.
摘要翻译： 连接装置（70）提供X射线管的定子马达（50）和定子线（56）之间的电连接。 连接装置通过将螺纹部分拧入壳体中的相应螺纹孔中而与x射线管壳体（30）连接以形成防漏密封。 螺纹部分与诸如卡口插座的连接部分刚性地连接，该连接部分接收定子线的对应配件（102）。 密封在连接装置中的导电路径提供了插座与外壳内部之间的电连接。 连接装置允许定子线与壳体快速连接或断开，但提供了抵抗冷却油从壳体泄漏的密封。
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公开(公告)号：EP1211917A1
公开(公告)日：2002-06-05
申请号：EP01309937.9
申请日：2001-11-27
发明人： Malamud, Gabriel
CPC分类号： A61B6/4476 , A61B6/4028 , A61B6/4233 , H04N5/325 , H04N5/349 , H05G1/60
摘要： 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.
摘要翻译： 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。
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公开(公告)号：EP0860144B1
公开(公告)日：2002-05-22
申请号：EP98301045.5
申请日：1998-02-12
CPC分类号： A61B6/032 , A61B6/027 , A61B6/4085 , A61B10/0233 , A61B90/11 , G06T11/005 , G06T2211/428 , Y10S378/901
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