PROBLEM TO BE SOLVED: To realize an appropriate X-ray measurement according to the physique of a subject.SOLUTION: X-rays 11 of two types of energies, high energy X-rays and low energy X-rays, are used for a DXA (Dual X-ray Absorptiometry) method. A control section 20 controls a ratio of generation times between the high energy X-rays and the low energy X-rays, which are alternately and repeatedly generated by an X-ray generator 10, according to the physique of the subject 30. The control section 20, for example, alternately generates the high energy X-rays and the low energy X-rays by changing a tube voltage of an X-ray generation tube provided in the X-ray generator 10 to so as to control the ratio (tube voltage duty ratio) between the high energy X-rays and the low energy X-rays.COPYRIGHT: (C)2009,JPO&INPIT【課題】被検体の体格に応じた適切なX線測定を実現する。【解決手段】DXA法においては、高エネルギーX線と低エネルギーX線の二種類のエネルギーのX線11が利用される。制御部20は、被検体30の体格に応じて、X線発生器10が交互に繰り返し発生する高エネルギーX線と低エネルギーX線の発生時間の比率を制御する。制御部20は、X線発生器10内に設けられたX線発生管に対して、例えば管電圧を変化させて高エネルギーX線と低エネルギーX線を交互に発生させ、高エネルギーX線と低エネルギーX線の発生時間の比率(管電圧デューティー比)を制御する。【選択図】図1
