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Determination of the diagnostic x-ray tube practical peak voltage (PPV) from average or average peak voltage measurements

The practical peak voltage (PPV) has been adopted as the reference measuring quantity for the x-ray tube voltage. However, the majority of commercial kV-meter models measure the average peak, ŪP, the average, Ū, the effective, Ueff or the maximum peak, UP tube voltage. This work proposed a method for determination of the PPV from measurements with a kV-meter that measures the average Ū or the average peak, Ūp voltage. The kV-meter reading can be converted to the PPV by applying appropriate calibration coefficients and conversion factors. The average peak kPPV,kVp and the average kPPV,Uav conversion factors were calculated from virtual voltage waveforms for conventional diagnostic radiology (50–150 kV) and mammography (22–35 kV) tube voltages and for voltage ripples from 0% to 100%. Regression equation and coefficients provide the appropriate conversion factors at any given tube voltage and ripple. The influence of voltage waveform irregularities, like ‘spikes’ and pulse amplitude variations, on the conversion factors was investigated and discussed. The proposed method and the conversion factors were tested using six commercial kV-meters at several x-ray units. The deviations between the reference and the calculated—according to the proposed method—PPV values were less than 2%. Practical aspects on the voltage ripple measurement were addressed and discussed. The proposed method provides a rigorous base to determine the PPV with kV-meters from Ūp and Ū measurement. Users can benefit, since all kV-meters, irrespective of their measuring quantity, can be used to determine the PPV, complying with the IEC standard requirements.