研究目的
To establish a traceable system for the measurement of the Practical Peak Voltage (PPV), the exposure time, and the current for pulses in diagnostic applications such as radiology, mammography, dental, fluoroscopic, ensuring a better control of the x-ray dose.
研究成果
A reference and traceable system is now available for the calibration of x-ray quantities, Practical Peak Voltage, current and exposure time. FFT and inverse FFT technique are powerful tools to evaluate the frequency corrections of every waveform generated by x-ray equipment.
研究不足
The proximity effect is predominant but could be avoided by measuring the scale factor of the dividers at low voltage. Clamp meters with large diameters produce big errors at very low currents and fast pulses due to their unlinear frequency.
1：Experimental Design and Method Selection:
The setup includes two paired and frequency-compensated invasive resistive dividers for anode and cathode voltages, connected between the x-ray generator and the x-ray high voltage tube, combined with a storage digitiser. The linearity of each divider from 1 kV to 75 kV has been checked for various impulse types.
2：Sample Selection and Data Sources:
The system is used for the calibration of x-ray generators, invasive x-ray measurement units, and non-invasive instruments (kVp meters).
3：List of Experimental Equipment and Materials:
Resistive dividers, storage digitiser, clamp meter based on Hall Effect.
4：Experimental Procedures and Operational Workflow:
The measurement of impulse low current is done non-invasively using a clamp meter. FFT and inverse FFT techniques are used for corrections.
5：Data Analysis Methods:
Deconvolution technique is used to enhance the accuracy of the reference system.
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