| 摘要 |
PURPOSE:To prevent the mutual obstruction between an imaging device and a differential electrode by providing a plurality of differential electrodes of electrocardiograph for the purpose of sampling heart beat signals on regions other than the one where images of image-diagnosis for various medical treatment are displayed or photographed. CONSTITUTION:An LL defferential electrode 3 and a RL differential electrode 4 are connected to a differential amplifier 7 of an electrocardiograph 6 as a differential voltage input, while an indifferent electrode 5 is grounded 8 as a reference ground of the cardiograph 6. Out of those electrocardiographic signals which has been amplified by the differential amplifier 7 and signal- treated by the cardiograph 6, only the heart beat signals to represent heart beat action generate trigger signals from a trigger generator 10 of an imaging device 9 and actuate the imaging device 9. In this case, the imaging region 2 of a test specimen 1 is normally an organ located above a hip or a head part, thereby both the LL differential electrode 3 and the RL differential electrode 4 are positioned distant apart from the imaging region 2, therefore, are hardly affected even by a strong RF magnetic field or an X-rays. |
