Koral K F, Nolder C, Ciliax G, Rogers W L, Keyes J W
J Nucl Med. 1984 Mar;25(3):343-51.
Limited-angular-range tomography leads to an elongating distortion of the object in the direction of the z axis (perpendicular to the camera face). Two-view tomography appends to the usual data set another set of projections taken after the camera is rotated 90 degrees about an axis perpendicular to z. We investigated two-view tomography using a rotating-slant-hole collimator, 12 projections per view and the SMART iterative algorithm. Computer simulations extended previous results to include noise and attenuation. Phantoms imaged were the Au-rings in air and a ventricle phantom angled with respect to the z axis and placed in a water bath. Two-view results were generally superior compared to one-view results, were subject to some artifact in imaging defects, but could detect defects by looking at the differences between two sets of images, and were fairly insensitive to ventricle angulation. Therefore, two-view tomography has promise for thallium-type imaging.
有限角范围断层扫描会导致物体在z轴方向（垂直于相机面）出现拉长变形。双视图断层扫描在常规数据集之外，增加了另一组投影数据，这组投影是相机绕垂直于z轴的轴旋转90度后获取的。我们使用旋转斜孔准直器、每个视图12个投影以及SMART迭代算法对双视图断层扫描进行了研究。计算机模拟扩展了先前的结果，将噪声和衰减也纳入其中。所成像的体模包括空气中的金环以及相对于z轴倾斜并置于水浴中的心室体模。双视图结果总体上优于单视图结果，在成像缺陷方面存在一些伪影，但通过查看两组图像之间的差异能够检测到缺陷，并且对心室角度相当不敏感。因此，双视图断层扫描在铊类成像方面具有应用前景。
