91 —-— FWHM =8.5cm FWHM =f1.0cm lO rrors over, 20 30 40 50 DISTANCE (cm) otal inte, Fic. 75.—Point response function of the tested collimators it of the ( in whichj REAL DISTRIBUTION FWHM = 8.5 cm see FWHM =11.0 cm FWHM = 15.0 em -----ceeeeees 60 30 40 30 20 30 40 cm Fic. 76.-—-Influence of kernel A (xz,z') resolution RELATIVE AMOUNT OF ACTIVITY | 23 ] - that the d on the RELATIVE AMOUNT OF ACTIVITY _ nN ° on Oo mee of =15.0cm RELATIVE RESPONSE EP EPOEE ——— FWHM