Methods and arrangements for providing insulation in an X-ray generator are provided. A receiver acquires, from a plurality of leads, electrocardiogram signals that each includes an ST-segment. A catalyst regeneration event includes at least one of exposing the catalyst to a sufficiently high temperature over a time period that removes contaminants from the catalyst and manipulation of the exhaust gas composition to initiate andor accelerate removal of contaminants from the catalyst. The receiver further includes a preceding feedback unit configured to feed back a preceding matrix selection, wherein the preceding matrix selection corresponds to a preceding matrix feedback reduction scheme.