Fig. 2.

Measured SBRs of SPECT data of a phantom by the Southampton method plotted against the true SBR from measurements of aliquots by a well counter for the Toshiba GCA9300A (a), Philips Bright View (b), Siemens Symbia T6 (c), and GE Discovery MN/CT 670 (d). The linear regression lines are displayed for each reconstruction condition, namely, ChangACSC, ChangACNOSC, CTACSC, CTACNOSC, and NOACNOSC. Also shown is the line of identity (in gray). Similarly high correlations were also obtained between the measured SBR and true SBR in other SPECT scanners