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Proceedings Paper

High Performance Continuous Zoom X-Ray Image Intensifiers
Author(s): C. D. Robbins; R. S. Enck Jr.; J. P. Sackinger
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Paper Abstract

This paper discusses the development and performance of a 9-inch X-ray Image Intensifier featuring a continuously variable magnification from a 9-inch useful input diameter to a 5-inch useful input diameter at a fixed 20mm diameter output image. The pentode electron optical structure in this device was designed through utilization of a digital computer electron optics evaluation program. A brief analysis of the design technique is presented, with particular emphasis directed towards techniques used for prediction and optimization of electron optical performance parameters from computer analysis data. The described techniques resulted in a design which not only demonstrates geometric distortion of less than 5 percent and a flat focal plane surface, but also enables a single voltage divider magnification control which continuously varies the magnification while maintaining focus. This particular result enables incorporation of an integral power supply within the intensifier housing that provides complete operating voltages and subsecond zooming between 9-inch and 6-inch modes. Performance parameters of the device are also investigated with particular atten-tion to an MTF evaluation technique which applies to all X-ray image intensifiers. In addition to superior MTF, this new device also exhibits a conversion gain in excess of 5,000 with 125 linepairs per inch limiting resolution in the 6-inch input mode. Nine-inch mode gain is at least 10,000 with a limiting resolution of 90 linepairs per inch. The high gain and resolution of this new intensifier, in conjunction with its capability of rapid zooming with entire control provided by an integral power supply render it an excellent device for use in x-ray diagnostic equipment.

Paper Details

Date Published: 1 June 1972
PDF: 10 pages
Proc. SPIE 0035, Application of Optical Instrumentation in Medicine I, (1 June 1972);
Show Author Affiliations
C. D. Robbins, Varian LSE (United States)
R. S. Enck Jr., Varian LSE (United States)
J. P. Sackinger, Varian LSE (United States)

Published in SPIE Proceedings Vol. 0035:
Application of Optical Instrumentation in Medicine I
Paul L. Carson; William R. Hendee; William C. Zarnstorff, Editor(s)

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