A navigation method and apparatus is designed to efficiently retrieve the information on the scenic byways and to visit such scenic byways through calculated routes. Two plates of an electro-restrictive material, such as PZT or PMN, are jointed together. The method includes determining a patient specific breast thickness value for a particular patient being imaged by a mammography X-ray device having a radiation source and a detector and an associated imager pixel spacing value. The temperature sensor base is electrically coupled to the temperature sensor. A valve body engaging member is comprised of a plurality of arc-shaped plate members, which form circular shape.