Digital Fluoroscopy questions with correct answers

Automatic exposure rate control (AERC) Answer A device which automatically controls mAs and/or kV in order to obtain at a preselected location(s) a required *quantity of radiation per unit time*. Automatic exposure control (AEC or ABC - automatic brightness control) Answer A device which automatically controls one or more technique factors in order to obtain at a preselected location(s) a required *quantity of radiation*. CCD, ADC (analog digital digital converter), computer, and DAC (digital analog converter) Answer Additional equipment that is used in digital fluoroscopy instead of tv monitoring tubes Pixel Answer The smallest element of a digital image Matrix Answer A two-dimensional square of pixels 512 Answer Number of pixels in a 500 line digital fluoroscopy system 1024 Answer Number of pixels in a 1000 line digital fluoroscopy system 2048 Answer Number of pixels in a 2000 line digital fluoroscopy system Larger pixels Answer Are required to maintain a constant field of vision as matrix size decreases.