Harding G, Day M J
Acta Radiol Ther Phys Biol. 1976 Oct;15(5):465-80. doi: 10.3109/02841867609131780.
In view of the close relationship which exists between image aberrations and the form of the transfer function, the transfer functions of some different types of spiral tomographic movements have been calculated numerically. The results allow prediction of a type of spiral movement which yields blurring of favourable quality. The validity of this approach has been demonstrated experimentally, by comparing the blurring characteristics of tomographs with single and multiple circular movements. When the radii of the circles in the latter case are chosen with reference to the form of the transfer function, a marked improvement in blurring quality is apparent.
鉴于像差与传递函数形式之间存在密切关系，已对一些不同类型的螺旋断层扫描运动的传递函数进行了数值计算。结果能够预测出一种产生质量良好模糊效果的螺旋运动类型。通过比较具有单次和多次圆周运动的断层扫描仪的模糊特性，已通过实验证明了该方法的有效性。在后一种情况下，当根据传递函数的形式选择圆周半径时，模糊质量有明显改善。
