Yamamoto M
Phys Med Biol. 1981 May;26(3):489-99. doi: 10.1088/0031-9155/26/3/011.
A rotary positron-emission computed tomography system has been proposed in which detectors are mounted unequally spaced on a ring, so as to provide fine and uniform linear sampling during a 360 degree rotation of the ring around its centre. The usefulness of a simple iterative method for searching for a suitable arrangement of detectors is shown, and the dependence of sampling characteristics of such an arrangement on various parameters is clarified. These parameters include the number of detectors I, and the gaps between the adjacent detectors (referred to as angular separations). It is concluded that if the sum total of the angular separations is approximately larger than the angle A subtended at the centre by one detector unit (i.e. if 360 degree -IA greater than or equal to A), a detector arrangement having satisfactory sampling characteristics for positron reconstruction tomography can be determined. Using this iterative method, a 64-detector arrangement of a prototype rotary positron ECT system named POSITOLOGICA was designed and found to be almost optimal under the given conditions.
已提出一种旋转正电子发射计算机断层扫描系统，其中探测器以不等间距安装在一个环上，以便在环围绕其中心进行360度旋转期间提供精细且均匀的线性采样。展示了一种简单迭代方法用于寻找合适探测器排列的有效性，并阐明了这种排列的采样特性对各种参数的依赖性。这些参数包括探测器的数量I以及相邻探测器之间的间隙（称为角间距）。得出的结论是，如果角间距的总和大约大于一个探测器单元在中心所对的角度A（即如果360度 - IA大于或等于A），则可以确定一种对于正电子重建断层扫描具有令人满意采样特性的探测器排列。使用这种迭代方法，设计了名为POSITOLOGICA的原型旋转正电子ECT系统的64探测器排列，并发现其在给定条件下几乎是最优的。
