Radiographic/fluoroscopic imaging system with reduced patient do

Details Radiographic/fluoroscopic imaging system with reduced patient do Radiographic/fluoroscopic imaging system with reduced patient do

1996-11-29

1999-06-29

Church, Craig E.

X-ray or gamma ray systems or devices

Electronic circuit

With switching means

378 987, 378108, 378 982, H05G 164

Patent

active

059178825

ABSTRACT:
A radiographic/fluoroscopic imaging system provides rapid transition from fluoroscopic to radiographic imaging mode by maintaining the X-ray tube high voltage, increasing the filament current, allowing X-ray tube current to increase toward the desired radiographic current, and terminating exposure when the desired X-ray dose has been achieved. Rapid transition from radiographic to fluoroscopic imaging mode is provided by reducing x-ray tube high voltage to produce an equivalent fluoroscopic-level x-ray output at high initial current, dropping filament current, and enabling ABS control of the high-voltage. As x-ray tube current drops, ABS correspondingly increase high voltage to maintain the desired output. The imaging system obtains movement-related information by analyzing a video signal (such as from fluoroscopic image or an image from an optical camera trained on the patient), or from operator movement requests. The imaging system uses movement-related information to responsively control fluoroscopic pulse rate or other imaging parameters. The imaging system can also use such information to initiate a radiographic exposure, or advance to the next step of an operator programmed examination consisting of interspersed fluoroscopic and radiographic exposures. This results in a lower dose to both the patient and the examiner, consistent with high image quality.

REFERENCES:
patent: 4185198 (1980-01-01), Fujimoto
patent: 4649558 (1987-03-01), Brunn
patent: 4658413 (1987-04-01), Nishioka et al.
patent: 4924487 (1990-05-01), Nishiki

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