Castrup W
Rontgenblatter. 1980 Jun;33(6):289-97.
The quality of a tomogram is mainly determined by the fact whether and to what extent the details outside the sharply delineated tomographic area are visible as blurred shadows. The blurring effects with various tomography apparatus with multidimensional blurring were examined experimentally in two series of experiments: by means of a modulation transfer function on the one hand, and blurred images of a prepared skull of a corpse on the other. Both methods of examination showed that the blurring effect is much better with the complicated, multidimensional tomography movements (hypocycloids and spiral) than with the simple multidimensional ones (circle and ellipse). The differences between hypocycloidal and spiral blurring found experimentally by means of the modulation transfer functions, however, are just barely identifiable in the skull tomogram.
断层照片的质量主要取决于这样一个事实，即清晰划定的断层区域之外的细节是否可见以及在何种程度上可见为模糊的阴影。在两个系列的实验中，通过实验研究了各种具有多维模糊的断层摄影设备的模糊效果：一方面通过调制传递函数，另一方面通过一具尸体准备好的颅骨的模糊图像。两种检查方法均表明，复杂的多维断层摄影运动（摆线和螺旋线）产生的模糊效果比简单的多维运动（圆形和椭圆形）要好得多。然而，通过调制传递函数实验发现的摆线模糊和螺旋线模糊之间的差异，在颅骨断层照片中几乎无法识别。
