Positioning System For Multiple-Slit Array In Digital Radiography

Peter S. Prieto; John C. Wood; Donald B. Charleston; Yuichiro Kume; Kunio Doi

doi:10.1117/12.976528

13 October 1987 Positioning System For Multiple-Slit Array In Digital Radiography

Peter S. Prieto, John C. Wood, Donald B. Charleston, Yuichiro Kume, Kunio Doi

Proceedings Volume 0845, Visual Communications and Image Processing II; (1987) https://doi.org/10.1117/12.976528
Event: Cambridge Symposium on Optics in Medicine and Visual Image Processing, 1987, San Diego, CA, United States

Abstract

In order to reduce the effects of scatter from the object and those of veiling glare from the image intensifier (I.I.)-T.V. system in digital radiographic images, we have employed a multiple-slit x-ray beam imaging technique. For reconstruction of a final image, a multiple-slit assembly (MSA) was moved under the x-ray tube by a microprocessor-driven stepper motor. The accuracy of the movement was to be kept within ±10 μm with the aid of a shaft encoder. The MSA was moved over the required distance (0.1 mm to 2.0 mm) in 100 msec, corresponding to the time between x-ray exposures. Positional errors as well as construc-tion errors in the MSA contributed to artifacts in the image. We determined that positional errors were kept below the ±10 μm limit; this was confirmed by the size of the artifacts observed in the reconstructed images and by direct measurements of the MSA position with a dial indicator.

Citation Download Citation

Peter S. Prieto, John C. Wood, Donald B. Charleston, Yuichiro Kume, and Kunio Doi "Positioning System For Multiple-Slit Array In Digital Radiography", Proc. SPIE 0845, Visual Communications and Image Processing II, (13 October 1987); https://doi.org/10.1117/12.976528

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