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The Journal of Nuclear Medicine Vol. 22 No. 12 1069-1074
© 1981 by Society of Nuclear Medicine
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A Measure of Anger-Camera Linearity: Results with and without a Corrector

Kenneth F. Koral, Mark E. Schrader and Glenn F. Knoll

Medical Data Systems, Ann Arbor, Michigan

Correspondence: For reprints contact: Kenneth F. Koral, PhD, Medical Data Systems, 2311 Green Rd., Ann Arbor, MI 48105.

ABSTRACT

A method for measuring the X and Y linearity of an Anger camera coupled to a computer is presented. It has similarities to, and differences from, the method recommended by the National Electrical Manufacturers Association (NEMA). Test images are taken through a lead plate with parallel and equally spaced slots, and the locations of the lines in the images are fitted by least-squares with an equation that allows for slight misalignment. Discrepancies from the fit are calculated and displayed as a distribution over the camera field. The maximum and average discrepancies are tabulated. The field of view that is of interest is selectable within the analysis program.

Among four large-field-of-view uncorrected cameras, three 37-tube types (two measured using Tc-99m and one with Au-195) show a similar degree of nonlinearity. However, the maximum and average discrepancies from linearity for a 61-tube prototype camera, measured using Tc-99m over a 15-in. field of view, are 40% of those for the other three. For the four cameras, an event-shifting on-line corrector with best-case sampling improves linearity by an average factor of 5.5, including both 15- and 11.25-in. fields of view.






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Copyright © 1981 by the Society of Nuclear Medicine.