A microchip fabrication chamber has a pedestal adapted to retain a wafer during processing steps conducted within the chamber. First, supply timing information determining supply timing of the data signal provided to the internal circuit is generated using the data signal read from the memory. The generally circular main segment is adapted to releasably anchor itself in the tubular region and to map circumferentially around the tubular region and the generally linear segment is adapted to contact generally along its length heart wall tissue near an ostium of the tubular region. An alternative embodiment communicates a request, over a communications network, for the line record. A homogenized combined magnetic resonance image is obtained without reducing the signal-to-noise ratio that can be achieved by the local antenna.