TABLE II.

ROI measurements of activity concentration (counts/ml) (mean ± intertransaxial slice σ) from true and attenuation corrected (AC) cylinder phantom images.

Method	Hot rod	Cold rod	Background
True (air μ-map)	$33.30\pm 0.37$	$-0.13\pm 0.15$	$6.82\pm 0.04$
w/ AC	$33.53\pm 0.36$	$-0.14\pm 0.16$	$6.87\pm 0.06$