X-ray or gamma ray systems or devices – Electronic circuit – X-ray source power supply
Patent
1990-12-28
1992-06-02
Howell, Janice A.
X-ray or gamma ray systems or devices
Electronic circuit
X-ray source power supply
378 62, 378 99, 358111, H05G 122
Patent
active
051194090
ABSTRACT:
An apparatus and method for dynamically controlling the generation of radiation pulses during pulse-type fluoroscopic imaging. Brightness of an image produced by a pulse is detected, converted to a digital value and compared to an acceptable predetermined value range. If the brightness is not acceptable, the pulse rate is reset to a predetermined, relatively fast rate and the energy level for the next pulse adjusted up or down to increase or decrease the brightness as necessary. Once the brightness is found to be acceptable, the pulse rate is returned to the original pulse rate. If it is determined that motion is occurring, the pulse rate will increase to the relatively fast predetermined pulse rate to provide substantially real-time imaging. If the brightness becomes unacceptable for a pulse during the period of motion, the energy level for the subsequent pulse will be adjusted. This technique of pulse control effectively reduces patient dosage and operator exposure to radiation, provides substantially real-time imaging during periods of relative motion and provides rapid image stabilization times.
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Assa Menachem
Nields Morgan W.
Novak Mark E.
Perin Pascal
Fischer Imaging Corporation
Howell Janice A.
Porta David P.
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