The present invention relates to a stirred-tank reactor system and methods of preparing such systems. Also described are devices comprising calibration phantoms; methods of using these devices; methods of formulating databases containing information regarding x-ray images; the databases themselves; and methods of manipulating the information and databases. The invention also concerns whey obtainable by said preparation method characterised in that it comprises a lactose content between 10 and 50 wt. The organic light shield layer may mask the gaps between pixel electrodes. In one configuration, the top tether anchorage point included in newer vehicles as part of the LATCH anchorage point system is employed.