Layer Formation in Narrow Beam Rotation Radiography

Abstract

The layer formation in rotation narrow beam radiography is analysed mathematically. It is shown that the blurring, and consequently the layer formation, is due primarily to the width of the beam; no blurring and no layer formation occur if the beam is of negligible width. The blurring is significantly affected by the magnification factor in the specific central projection typical of narrow beam rotation methods, where the rotation centre serves as an imaginary focus.