インバータ式 X 線装置の管電圧波形の周波数解析

Abstract

The tube voltage waveform in an inverter type X-ray high-voltage generator has a very high frequency as compared to single-phase, three-phase and constant potential generators. Tube voltage waveforms in an inverter type X-ray high-voltage generator vary according to tube loading and apparatus. It is very significant that X-ray tube voltage and waveforms should be accurately measured and evaluated. For tube voltage waveforms, the ripple and peak number have been used. However, for high frequency waveforms of tube voltage such as those of the inverter type X-ray high-voltage generator, the ripple and peak number are insufficient for a more detailed estimation. Then, we suggest the frequency analysis method as a newer and more detailed one. In this method, waveforms are analyzed using the fast Fourier transform (FFT). In this paper, the tube voltage waveforms in the inverter type X-ray high-voltage generator will be estimated in detail. The method is convenient to the assessment of distortion and frequency of tube voltage waveforms, especially useful for a detailed evaluation of the inverter type X-ray high-voltage generator. In other words, this method makes possible an objective comparison and careful examination of tube voltage waveforms in the inverter type X-ray high-voltage generator. Therefore, this method is useful for better quality control (QC) of the inverter type X-ray high-voltage generator.