X-ray or gamma ray systems or devices – Electronic circuit – X-ray source power supply
Patent
1992-10-05
1994-06-07
Porta, David P.
X-ray or gamma ray systems or devices
Electronic circuit
X-ray source power supply
378 97, 378111, 378112, H05G 164, H05G 132, H05G 144
Patent
active
053196961
ABSTRACT:
An interactive system for producing acceptable quality fluoroscopy images determines X-ray tube photon count and voltage while minimizing X-ray radiation dosage to a subject. Parameters of the subject and the type of image to be produced are provided to the system. X-ray tube voltage U and photon count Q are initialized at a fraction of conventional values for a portion of a subject to be imaged. An image is created and sectioned into rectangles. Rectangles having the greatest and least gradient values are used to determine variances indicating signal and noise power respectively. Images are produced and adjusted until the maximum transmitted power is reached, or the signal-to-noise ratio does not increase beyond a quality increment. The process is repeated to optimize X-ray tube voltage. The X-ray fluoroscopy procedure is then performed with the optimum X-ray tube photon count and the optimum X-ray tube voltage thereby reducing X-ray dosage. The optimization is repeated periodically to readjust the system.
REFERENCES:
patent: 5224141 (1993-06-01), Yassa et al.
U.S. Patent Application "X-Ray Fluoroscopy System for Reducing Dosage Employing Iterative Power Ratio Estimation", Ser. No. RD-21,423 by Richard I. Hartley.
U.S. Patent Application "Fluoroscopic Method With Reduced X-Ray Dosage", Ser. No. 07/810,341 by Fathy F. Yassa, et al. Filed Dec. 9, 1991.
"Imaging Systems for Medical Diagnostics", by Krestel, Aktiengesellschaft, Berlin and Munich, p. 103 no date.
"Medical Imaging Systems" by Macovski, 1983 Prentice-Hall, Englewood Cliffs, N.J. 07632, p. 27.
"Effect of Pulsed Progressive Fluoroscopy on Reduction of Radiatin Dose in the Cardiac Catherization Laboratory", by Holmes, Wondrow, Gray, Vetter, Fellows and Julsrud, Journal. American College of Cardiology, vol. 15, No. 1, pp. 159-162, no date.
Abdel-Malek Aiman A.
Bloomer John J.
Roehm Steven P.
General Electric Company
Porta David P.
Snyder Marvin
Zale Lawrence P.
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