The invention relates to a field device and a method for calibrating a field device, having a field device electronics and a sensor unit for process measurements, wherein the field device electronics receives measurement signals of the sensor unit, wherein the field device electronics includes an evaluation unit for evaluating the measurement signals and means for calibrating the field device. The decoder can then calculate a second integrity check code over the actual received network abstraction layer units. These and other embodiments may include a system restore process that consumes this file. 5% by weight, based on the dry weight of the particulate solid material, of either an anionic polyelectrolyte which comprises a water-soluble salt of a copolymer of acrylic acid with acrylamide; or a water-soluble condensed phosphate salt. More particularly, the present disclosure relates to apparatus and methods for contrast imaging in which the elevation beamwidth is controlled to reduce image artifacts, which result from contrast agent being carried into the image region by motion or respiration and not by reperfusion.