A physical phantom reference to control for variability of computed tomography measurement results duplicates the density curve of blood perfusion of contrast material in a healthy aorta or large artery to normalize observed changes in healthy arterial blood perfusion when calculating the reduction in tumor blood perfusion between two examination times. The invention generates a branch instruction by one processing element of the plurality of processing elements, sends the branch instruction to the plurality of processing elements. First and second trapping slots are positioned parallel to their respective plurality of echelons. The OCR system determines if the alphanumeric series and the matching series of characters extracted from the machine-readable code comprise any discrepancies and corrects the alphanumeric series of characters. In one embodiment, the method of analyzing the injection well, the production well, and reservoir contained in the subterranean formation includes the steps of evaluation of completion information, reservoir data, or both. The latch circuit latches and outputs the fail information of a preset number bit output from the compare circuit during the time when a control signal for latching and outputting the fail information is in active state.