A dough press machine is provided for flattening a quantity of dough. In order to suppress shadowing effects due to a surgical instrument moved in the imaging beam path, a time series of OCT images is produced. The first wireless protocol circuitry may be configured to receive and process first signals according to a first wireless protocol. The steam conditioning valve 1 further has a reduced annular section 9 with a nozzle 5a disposed therein for injecting subcooled water mist W.