Abstract
Considering radiographic techniques, it is important to know the characteristics of the X-ray generator. We investigated and analyzed the characteristics (percentage ripple of tube voltage, X-ray output linearity relative to radiographic time and tube current, reproducibility of X-ray outputs, tube voltage rise and fall times) of an X-ray generator of the inverter type. In spite of its compact size, 280mm×220mm×190mm, and light weight, this X-ray generator is capable of a maximum output of 80kW. At a tube voltage of 60-120kV and tube current of 50-1000mA, percentage ripple was approximately 1.1 to 5.4%. This value decreased as the tube voltage increased and current decreased. At 100kV and within the range of 50-800mA, the X-ray output relative to the current time product and irradiation time showed non-linearity as the irradiation time was reduced. A significant increase in non-linearity was noted as tube current decreased. At the minimum irradiation time, the non-linearity of the X-ray output reached 7 to 16%. As tube current decreased, non-linearity of 9.7 to 22.4% was observed at 60-120kV, and 50-800mA. The rise time f the tube voltage was 0.7ms (0 to Peak). The X-ray load resulted in a very slight change in the rise time, and did not present a problem. The fall time ranged from 1.3 to 8.8ms (Peak to 10kV). The time became longer as the current decreased. We believe that because the rise and fall times of the tube voltage waveform affect irradiation times and radiographic results, the X-ray load must not cause any changes in these factors. Ideally, the tube voltage waveform output should be square regardless of the X-ray load.
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