Alignment of x-ray tube focal spots for spectral measurement

Abstract
A general method to align a diagnostic X-ray machine for X-ray spectrum measurement purpose was theoretically and experimentally investigated by means of the optical alignment of focal pinhole images. Focal pinhole images were obtained by using a multi-pinholed lead plate. The vertical plane, including the central axis and tube axis, was decided upon by observing the symmetry of focal images. The central axis was designated as a line through the center of focus parallel to the target surface lying in the vertical plane. A method to determine the manipulation of the central axis in any direction is presented.

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