X-ray tube apparatus, x-rya exposure determiner, x-ray generator using them, and radiograph

摘要

An X-ray tube apparatus ( 2 ) having an anode rotating mechanism for preventing damage of the anode ( 23 ) of the X-ray tube apparatus thereby to shorten the X-ray exposure waiting time. When the measured number of revolutions of a rotary anode is determined to be predetermined number from only the impedance or current information on the basis of both voltage information and current information on a stator coil ( 22 ) of motor constituent elements for rotating the rotary anode, a DC high voltage outputted from an X-ray high-voltage unit ( 1 ) is applied between the anode ( 23 ) and a cathode ( 24 ) of the X-ray tube apparatus, thus exposing a subject ( 130 ) to X-rays and imaging the subject. An X-ray generating device and a radiograph are also disclosed.