| 摘要 |
PURPOSE:To improve inspection efficiency and fluoroscopy capability by controlling so as to generate pulse X-rays with the maximum tube current automatically considering the X-ray tube load factor based on the set pulse rate and tube voltage. CONSTITUTION:A tube voltage setting signal from a tube voltage setting circuit 1 and the pulse rate setting signal from a pulse rate setting circuit 2 are inputted to a judgment sequence circuit 3, the optimum tube current corresponding to both setting signals is selected in this circuit 3, and the selected signal is fed to a tube current setting circuit 4. The judgment sequence circuit 3 is constituted by crossing tube voltage setting signal lines and pulse rate setting signal lines in a matrix shape and connecting NAND circuits 5 to their cross points respectively, and a 0-output is generated only by the NAND circuit 5 at the cross point of the set tube voltage line and pulse rate line. Individual outputs 11- 22... of many NAND circuits 5 are inputted to individual tube current setting circuits 4 set so as to generate the maximum tube current mA under individual combinations of the tube voltage and pulse rate. |
