A ball pivot of a ball and socket joint for a motor vehicle, with a pivot and with a joint ball connected thereto. A first set of detectors detects projection radiation corresponding to the at least first x-ray source and generates first projection data indicative of the detected radiation, and a second set of detectors detects projection radiation corresponding to the at least second x-ray source and generates second projection data indicative of the detected radiation. Methods of using the compounds for treating arginine methyltransferase-mediated disorders are also described. The shielding member has at least one shielding plate disposed inside the insulating body.