X-ray or gamma ray systems or devices – Beam control – Scanner
Patent
1986-04-14
1988-09-20
Church, Craig E.
X-ray or gamma ray systems or devices
Beam control
Scanner
378108, 378110, 378112, 378160, G21K 510
Patent
active
047730870
ABSTRACT:
The quality of x-ray shadowgraphic images is improved by beam equalization controlled to ensure that just the right amount of radiation is used to accomplish the desired result, be it a desired image density and contrast or a desired signal-to-noise ratio or some other desired characteristic. The new techniques include: (1) maintaining a substantially constant signal-to-noise ratio throughout the image by measuring both scattered and primary radiation and using the results in a feedback loop to control the x-ray tube output, (2) raster scanning an x-ray beam along straight lines at constant velocity within a line by using a curved slit rotating aperture, (3) simultaneously controlling each of the intensity and hardness of a scanned x-ray beam as determined by post-patient x-ray measurements, and (4) using a segmented fan to scan the patient in a direction transverse to the plane of the fan and individually modulating each beam segment to achieve desired image characteristics.
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Wandtke, J. C. and Plewes, D. B., Improved Chest Radiography with Equalization, RadioGraphics, vol. 3, No. 1, Mar. 1983, pp. 141-154.
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Church Craig E.
Freeman John C.
University of Rochester
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