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The ECAT High Resolution Research Tomograph (HRRT) is a dedicated human brain PET camera with a 6% absolute sensitivity and a (2.3mm)3 spatial resolution, improving to (1.8mm)3 when point spread function (PSF) resolution recovery algorithms are used. These values are very close to those of the dedicated small animal PET camera microPET FOCUS 120 (F120). The larger axial and transaxial FoV of the HRRT...