Abstract: Described herein is a cable length compensator for inclusion in video imaging systems such as X-ray video imaging systems. When such systems are installed at sites of use, cables must generally be installed in the signal path, and the lengths of these cables—which can affect signal resolution—generally cannot be predicted prior to the time of installation. The cable compensator may be situated in the signal path along with the cable to compensate the signal for the effects of the cable so that the desired gain is provided across the desired range of signal frequencies. The compensator includes a low frequency compensation path and a high frequency compensation path, wherein the low frequency compensation path provides a simple gain adjustment to low frequency signals and the high frequency path provides gain adjustment dependent on both signal frequency and cable length.

Abstract: A mobile x-ray unit operates from a rechargeable battery in a number of different modes which draw current from the battery. Remaining battery capacity is calculated by integrating the current drawn from the battery in each of its operating modes, and periodically subtracting this value from a value indicative of remaining capacity. The result is displayed to provide an accurate indication of remaining battery capacity.

Abstract: A mobile x-ray unit operates from a rechargeable battery in a number of different modes which draw current from the battery. The present invention determines the number of patient exams remaining in the mobile x-ray unit, and has the capability of monitoring battery capacity usage as well as displaying information. The current drawn from the battery is measured as the system operates, which allows for the remaining capacity of the battery to be calculated. The remaining capacity of the battery can be adjusted based on usage of the system in each particular application. The system then calculates patient exams remaining based on the adjusted calculated remaining capacity of the battery, and displays the calculated patient exams remaining.

Abstract: A filament current regulator for an X-ray generator includes a circuit which compares the actual X-ray tube filament current to a predefined filament current reference value. Another circuit is included which compares the actual X-ray tube excitation voltage, applied across the anode and to cathode of the tube, to a predefined reference voltage value. The regulator adjusts the filament current during a first time interval of an exposure based on only the filament current comparison, and during the remainder of the exposure based substantially on the excitation voltage comparison. The regulator apparatus also integrates the difference between the actual filament current and the reference current value over a given interval during the exposure. The integrated result is employed by the regulator to redefine the filament current reference value.