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The Improvement of Definition by X-ray Image Magnification

1956; Wiley; Volume: 29; Issue: 342 Linguagem: Inglês

10.1259/0007-1285-29-342-335

1748-880X

Arie Y. Nemet, W. F. Cox,

Radiation Dose and Imaging

Reduction of blurring by X-ray magnification in both fluoroscopy and radiography has been described by Burger, Combée and van der Tuuk (1946) and by Fletcher and Rowley (1951). A short summary of the results that can be obtained with the more usual sizes of tube foci will therefore perhaps be of interest. The principle of magnification has been described in detail by Burger et al. (loc. cit.) so that only a short review need be given here. An X-ray image formed by an infinitely small focus and with no magnification will be blurred by the film or fluorescent screen only, so that details smaller than a certain size, comparable with the film or screen blurring, become invisible. If the image is enlarged M times the blurring, as before, is due to the film or screen only. The size of a detail in the object will, however, appear M times larger, so the blurring is effectively reduced M times. With practical tube foci, geometrical blurring will also occur and increase with magnification. The effect of magnification will therefore become less obvious.