Position monitoring method and medical mobile X-ray device

For checking the positional accuracy, a method for automatically monitoring a position and/or an angle of inclination of a component of a medical mobile X-ray device using at least one inertial measurement unit is provided. The mobile X-ray device has a device trolley and an adjustable C-arm. The at least one inertial measurement unit is arranged on the mobile X-ray device. The method includes: acquiring at least one measured value of the inertial measurement unit; evaluating the at least one measured value of the inertial measurement unit with regard to a position and/or an angle of inclination of the component of the mobile X-ray device; comparing the evaluated position and/or the at least one evaluated angle of inclination with at least one specified value and determining deviations from the at least one specified value; and outputting an indication or a display when the deviation overshoots a threshold value.