With continuous x-rays (i.e. x-rays are on all the time) the exposure time is simply the inverse of the frame rate. For example, if the camera is running at two frames per second, the exposure time for each frame is 500 ms. On the other hand, if a pulsed source or a shutter is used, then the exposure time is determined by the length of time that x-rays are incident on the camera. This is typically independent of the frame rate. The integration time is the number of seconds that the photodiodes in the sensor array collect charge, which is always the inverse of the frame rate.