X-ray or gamma ray systems or devices – Electronic circuit – X-ray source power supply
Patent
1992-10-05
1994-03-08
Porta, David P.
X-ray or gamma ray systems or devices
Electronic circuit
X-ray source power supply
378 97, H05G 144
Patent
active
052934152
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 and current are initialized at a fraction of conventional values for a portion of a subject to be imaged. An image is then created and transformed. A power ratio of low frequency components to high frequency components is calculated indicating quality of the image. Images are produced and adjusted until the maximum exposure is reached, or the power ratio does not increase beyond a quality increment. The process is repeated to optimize X-ray tube voltage. The X-ray fluoroscopy procedure is performed with the optimum X-ray tube photon count and the optimum 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 Dose Reduction in Pulsed Systems by Adaptive X-Ray Pulse Adjustment" RD-21,361 by Aiman A. Abdel-Malek, et al.
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 Radiation Dose in the Cardiac Catherization Laboratory", by Holmes, Wondrow, Gary, Vetter, Fellows and Julsrud, Journal. American College of Cardiology, vol. 15, No. 1, pp. 159-162 no date.
Fibonacci & Lucas numbers, an the Golden Section--Theory and Applications by S. Vadja, published by Ellis Horwood Limited, Cichester, 1989.
Abdel-Malek Aiman A.
Bloomer John J.
Hartley Richard I.
General Electric Company
Porta David P.
Snyder Marvin
Zale Lawrence P.
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