1. An X-ray imaging apparatus for medical examination comprising: a first X-ray generating means for generating pulses of X rays onto a human body, each X-ray pulse having an X-ray trailing edge; a first image intensifier for receiving the pulses of X rays from the first X-ray generating means which pass through the human body and for converting the received X rays into a first optical image; a second X-ray generating means for generating pulses of X rays onto a human body, each X-ray pulse having an X-ray trailing edge; a second image intensifier for receiving the pulses of X rays from the second X-ray generating means which pass through the human body and for converting the received X rays into a second optical image; a first CCD for receiving the first optical image and generating electron charges representing the first optical image; a second CCD for receiving the second optical image and generating electron charges representing the second optical image; a CCD drive unit connected to the first and second CCDs for controlling an electron charge transfer operation in the first and second CCDs; a system controller connected to the first and second X-ray generating means for controlling the generation of the pulses of X rays from the first and second X-ray generating means and connected to the CCD drive unit in order to control the CCD drive unit to apply an electronic shutter pulse and a field shift pulse to the first and second CCD; a first display connected to the first CCD for receiving the electron charges and providing a visual image on a screen representative of the first optical image; and a second display connected to the second CCD for receiving the electron charges and providing a visual image on a screen representative of the second optical image, wherein the system controller controls the first and second generating means to repeatedly generate pulses of X rays and controls the CCD drive unit to apply the electronic shutter pulse just before each X-ray pulse and the field shift pulse just prior to the X-ray trailing edge of each X-ray pulse.