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Alignment of x‐ray tube focal spots for spectral measurement
Author(s) -
Nishizawa Kunihide,
Maekoshi Hisashi,
Kamiya Yoshihiro,
Kobayashi Yoshio,
Ohara Ken,
Sakuma Sadayuki
Publication year - 1982
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.595086
Subject(s) - pinhole (optics) , optics , cardinal point , optical axis , x ray tube , focus (optics) , physics , focal length , plane (geometry) , geometry , mathematics , electrode , anode , quantum mechanics , lens (geology)
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.