Fig. 4From: Gamma camera imaging characteristics of 166Ho and 99mTc used in Selective Internal Radiation TherapyContrast recovery coefficients (%) and contrast-to-noise ratios as a function of sphere diameter for 99mTc (upper row) and 166Ho (lower row) for different projection times. Data was determined using the NEMA image quality phantom at a sphere-to-background activity concentration ratio of 8:1Back to article page