X線管電圧のリプル百分率とX線出力 : マンモグラフィ用X線発生装置

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Various characteristics of x-ray generators used for mammography(tube voltage, tube current, percentage average error of irradiation time, percentage ripple of the tube voltage waveform, linearity, and reproducibility of the photographic effect)have already been clarified by the authors. In our more recent investigations, x-ray output and radiation quality as percentage ripple of the tube voltage waveform were evaluated using the dynamic study method with the aluminum filter specified in the International Electrotechnical Commission(IEC) standard. In addition, we also assessed the effects of fluctuation in percentage ripple of the tube voltage waveform on the x-ray spectrum. Based on the results obtained, the characteristics of an ideal x-ray generator for mammography are discussed. The results of this study showed that x-ray output differences in terms of percentage ripple ranged from 45% to 82% compared with that of a constant-potential high-voltage generator. With regard to radiation quality, differences of 0.01 to 0.02 mm were found in the half value layer using an aluminum filter. The thicker the x-ray absorber, the more marked the effects of percentage ripple. In terms of the x-ray spectrum, moreover, characteristic x-rays(at 17.4 and 19.5 keV)cannot be effectively used, although a molybdenum target or molybdenum filter is used. Based on these results, a constant potential high-voltage generator with percentage ripple of 4% or less in the tube voltage waveform should be employed for mammography.
公益社団法人日本放射線技術学会の論文
1998-10-20

X線管電圧のリプル百分率とX線出力 : マンモグラフィ用X線発生装置

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