| 摘要 |
PURPOSE:To display a video signal at the use of and disuse a lung field as diagnosis information by the maximum resolution of an A/D converter by selecting whether or not the lung field is to be used as diagnosis information in the screening of a heart blood vessel. CONSTITUTION:A video signal Vin from a TV camera 10 is selected to any one of route 1 or route 2 by a switch SW7 on the basis of a signal deciding whether the lung field information from a keyboard KB is to be selected or not. If the lung field information is unnecessary, a resistance value setting up the gain of the 1st amplifier AMP 1 or the 2nd amplifier AMP 2 is selected by switches SW2, SW3 in accordance with the digital value of variable voltage decided by the peak holding value of video signal and the average value. The AMP2 optimizes the level of the video signal to set in the input range of a log converter 14 and the output of the log converter 14 is optimized to input to an A/D converter 34. |
