The invention provides a nested tubing cannula which comprises outer and inner elongate tubular members, both having a proximal end, a distal end, and a lumen therebetween. A rotating frame is rotatably supported by the pivotable portion and configured to rotate about a longitudinal axis around an examination region and a rotating frame balancer selectively introduces a rotating frame mass imbalance. An inner sole board is manufactured in an injection molding process requiring only one mold. An appended log list is created wherein the system ID, time-stamp and log sequence number comprise appended information that is logically appended to each of respective ones of the log identifiers.