Abstract
A microfocus x-ray tube is useful in order to perform magnification digital radiography. The 100-µm-focus x-ray generator consists of a main controller for regulating the tube voltage and current and a tube unit with a high-voltage circuit and a fixed anode x-ray tube. The maximum tube voltage, current, and electric power were 105 kV, 0.5 mA, and 50 W, respectively. Using a 50-µm-thick tungsten filter, the x-ray intensity was 34.0 µGy/s at 1.0 m from the source with a tube voltage of 100 kV and a current of 0.50 mA. Since K-series characteristic x-rays from tungsten targets are absorbed effectively by gadolinium-based contrast media, these x-rays are very useful to perform enhanced angiography. Magnification angiography was performed by two-time magnification imaging with a computed radiography system. In angiography of non-living animals, we observed fine blood vessels of approximately 100 µm with high contrasts.
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