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

申请人： Marconi Medical Systems, Inc.

发明人： Gagnon, Daniel ,  Tung, Chi-Hua

IPC分类号： G01T1/29 ,  G01T1/164

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.

公开(公告)号：EP0526970B1

公开(公告)日：2001-08-29

申请号：EP92305165.0

申请日：1992-06-05

申请人： Marconi Medical Systems, Inc. ,  THE UNIVERSITY OF UTAH

发明人： Zeng, Gengsheng Lawrence ,  Gullberg, Grant T. ,  Tung, Chi-Hua ,  Christian, Paul E. ,  Morgan, Hugh T.

IPC分类号： A61B6/00 ,  G01T1/29 ,  G06T11/00

CPC分类号： A61B6/4429 ,  A61B5/1077 ,  A61B6/037 ,  A61B6/482 ,  A61B6/5235 ,  A61B6/583 ,  A61B6/589 ,  G01T1/1615 ,  G01T1/2985 ,  G06T11/005

公开(公告)号：EP1132757A2

公开(公告)日：2001-09-12

申请号：EP01302242.1

申请日：2001-03-12

申请人： Marconi Medical Systems, Inc.

发明人： Gagnon, Daniel ,  Tung, Chi-Hua

IPC分类号： G01T1/29

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.

摘要翻译： 与核医学伽马照相机一起使用的非对称采样方案便于采集一整套较高分辨率的发射数据和较低分辨率的传输数据，同时机架的360°旋转完成。 台架包含多个辐射检测器和至少一个可调节安装的辐射源。 在扫描期间，在整个旋转的第一个180°（P1，...，P6）期间，机架围绕主体接收孔径逐渐旋转预定的步长。 然后将台架围绕主体接收孔旋转预定步长（P7或P8）的一半。 然后，在整个扫描的剩余180°（P8，...，P12）中，台架在主体接收孔周围逐渐旋转预定的步长。 在扫描的后半段（P8，...，P12）收集的发射数据被交织到扫描前半部分的数据中。 这种采样通过将大约一半的步数减少来减少总体扫描时间，因此，在龙门架旋转并停止时，消除了50％的死区时间。

公开(公告)号：EP1132756A2

公开(公告)日：2001-09-12

申请号：EP01302241.3

申请日：2001-03-12

申请人： Marconi Medical Systems, Inc.

发明人： Gagnon, Daniel ,  Tung, Chi-Hua

IPC分类号： G01T1/29

CPC分类号： G01T1/1648

摘要： A continuous rotation sampling scheme for use with a nuclear medicine gamma camera facilitates collection of transmission and emission data leading to a reduced overall scan time. The gantry contains a plurality of radiation detector heads (20a-20c) with planar faces and at least one adjustably mounted radiation source (30a). During transmission data collection, the gantry continuously rotates about a subject receiving aperture while the radiation source (30a) continuously rasters back and forth across the field of view. The detected transmission radiation (32a) is reconstructed into an attenuation volumetric image representation by a transmission reconstruction processor. The transmission reconstruction processor performs a fan beam reconstruction algorithm in each of a multiplicity of planes perpendicular to an axis of rotation. An angular displacement versus radiation source motion index is calculated in order to update the transmission reconstruction for a sampled data line of transmission radiation. Such continuous rotation during transmission data acquisition reduces overall scan time by eliminating the dead time during which the gantry rotates and comes to rest at incremental angular orientations. The patient is injected with a radioisotope which emits emission radiation. The emission radiation is also detected by the detector heads (20a-20c), corrected with the reconstructed transmission radiation, and reconstructed into a corrected emission radiation volumetric image.

摘要翻译： 与核医学伽玛相机一起使用的连续旋转采样方案便于收集传输和发射数据，从而减少总体扫描时间。 台架包含具有平面的多个辐射探测器头（20a-20c）和至少一个可调整安装的辐射源（30a）。 在传输数据收集期间，当辐射源（30a）在视野内连续地来回扫描时，台架围绕对象接收孔连续旋转。 检测到的传输辐射（32a）被传输重构处理器重建为衰减体积图像表示。 传输重建处理器在垂直于旋转轴的多个平面中的每一个中执行扇形射束重建算法。 计算角位移对辐射源运动指数，以便更新传输辐射的采样数据线的传输重建。 传输数据采集期间的这种连续旋转通过消除机架旋转期间的停滞时间并且以增量角度方向停止而减少总体扫描时间。 患者注射放射性同位素，发射放射辐射。 探测头（20a-20c）也检测发射辐射，用重建的透射辐射校正，并重构为校正的发射辐射体积图像。