Fig. 5

Contrast recovery coefficients (%) and contrast-to-noise ratios as a function of sphere diameter determined using the NEMA image quality phantom at a sphere-to-background activity concentration ratio of 8:1. ^99mTc acquired with LEHR collimator and with MELP collimator and reduced scan time (1.5 s projection time) and ¹⁶⁶Ho acquired with MELP collimator. ^99mTc and ¹⁶⁶Ho acquired with the modified phantom setup mimicking patient obesity. For measurements performed twice, results are presented as the mean and standard deviation (error bars)