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CN102245107A 用于放大的3D视场的半圆反向偏移扫描 无效 - 撤回

用于放大的3D视场的半圆反向偏移扫描
摘要：
一种计算机层析成像获取方法、一种成像系统、一种计算机可读介质提供：将辐射探测器(204)从具有中心横向视场并具有中心探测器几何结构的位置侧向移位至第一偏移位置(212)；由所述辐射源(202)发射第一辐射、由所述辐射探测器(204)探测所述第一辐射、并获取表示所述第一辐射的投射数据；绕所述旋转轴(214)旋转所述支撑体180°；由所述辐射源(202)发射第二辐射、由所述辐射探测器(204)探测所述第二辐射、并获取表示所述第二辐射的投射数据；以与所述第一移位(a)相反的方向和所述第一移位(a)两倍的长度将所述辐射源(204)从所述第一偏移位置侧向移位至第二偏移位置(226)；由所述辐射源(202)发射第三辐射、由所述辐射探测器(204)探测所述第三辐射、并获取表示所述第三辐射的投射数据；绕所述旋转轴(214)旋转所述支撑体180°；以及由所述辐射源(202)发射第四辐射、由所述辐射探测器(204)探测所述第四辐射、并获取表示所述第四辐射的投射数据。
摘要（英）：

A computed tomography acquisition method, an imaging system, a computer readable medium provides laterally displacing a radiation detector (204) from a position with centered detector geometry with a centered transverse field of view to a first offset position (212); emitting first radiation by the radiation source (202), detecting the first radiation by the radiation detector (204) and acquiring projection data indicative of the first radiation; rotating the support around the rotational axis (214) by 180 DEG ; emitting second radiation by the radiation source (202), detecting the second radiation by the radiation detector (204) and acquiring projection data indicative of the second radiation; displacing the radiation detector (204) from the first offset position to a second offset position (226), with opposite direction and double length of the first displacement (a); emitting third radiation by the radiation source (202), detecting the third radiation by the radiation detector (204) and acquiring projection data indicative of the third radiation; rotating the support around the rotational axis (214) by 180 DEG; and emitting fourth radiation by the radiation source (202), detecting the fourth radiation by the radiation detector (204) and acquiring projection data indicative of the fourth radiation.

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