An Optimizing Method of X-ray Pulse Dose Waveform in Pulse Mode

Abstract

The invention discloses a method for optimizing the X-ray pulse dose waveform in the pulse mode. In the pulse mode, the enabling signal of the filament power supply in the pulse mode circuit is preceded by the enabling signal of the inverter drive, and the filament circuit is preheated to improve the The rising edge rate of the X-ray pulse dose in the pulse mode; on the basis of the original flyback circuit, the improved circuit of the filament is formed by adding the transformer winding N3, the Mos tube Q2, the inductor L1, the damping resistor Rs, and the bidirectional trigger diode DB3, so as to reduce the filament double The voltage at the terminal and the activity of free electrons accelerate the falling edge rate of the X-ray pulse dose in the pulse mode. The method can speed up the rate of the rising and falling edges of the X-ray dose, make the actual X-ray pulse dose waveform more tend to the ideal pulse shape, improve the image quality of X-ray imaging, and reduce the invalid X-ray dose received by the patient.

Description

An Optimization Method of X-ray Pulse Dose Waveform in Pulse Mode technical field The present invention relates to the technical field of X-ray imaging, in particular to a kind of X-ray pulse dose waveform in pulse mode. Optimization. Background technique [0002] At present, X-ray irradiation methods in the field of X-ray imaging are generally divided into: continuous DC mode and pulsed mode. like a in Fig. 1 is a schematic diagram of the ideal voltage and dose curve when working in continuous DC mode in the prior art, b is the prior art Schematic diagram of the ideal voltage and dose curve when working in medium pulse mode. By comparing the two curves, we can see that: continuous DC mode There is a huge disadvantage that the X-ray radiation dose received by the patient is significantly higher than in the pulsed mode. Clinical trial data indicate that: Under the condition of obtaining the same quality of X-ray imaging images, using the pulse mode irradiation mode,...

AI Technical Summary

Problems solved by technology

The core essence of the above solution is to use passive resistors to quickly release the energy stored in the capacitor, but the disadvantage of the above solution is that it cannot solve the contradictory relationship of "fast discharge and low power consumption".

If the discharge resistance is too small, the power consumption of the discharge resistance will be large during steady state operation, and its size will be large, which not only reduces the efficiency of the whole machine, but also increases the burden on the power circuit. Heat generation increases the temperature rise of the high-voltage fuel tank and reduces the reliability of the system; if the discharge resistance is too large, the rising and falling waveforms of the X-ray dose cannot be significantly improved

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