Methods and apparatus are provided for use in testing a memory coupled to a processing node. The rotor plates include a main body portion having a plate shape and a first axial face and a second axial face opposite to the first axial face. The resistance element, the substrate, and the wire harness and its connections to the resistance element are encapsulated by a nonconductive protective coating except over the area of the measurement resistor so that such resistor can be exposed to the adjacent environment. In the normal CT scanning technique, the scan position can be preset, or set by the operator with a DR image, or set by automatic analysis of the DR image. The inflatable maintaining lattice defines a plurality of single layered access windows around the inflatable chamber, and is configured and adapted to maintain the inflatable chamber in substantially the predetermined shape after an aperture is pierced in at least one of the plurality of access windows of the inflatable chamber.