Scanning rats on the high resolution research tomograph (HRRT): A comparison study with a dedicated micro-PET

Purpose: The Siemens ECAT high resolution research tomograph (HRRT) is a dedicated human brain PET camera with a 6% absolute sensitivity and a (2.3 mm) 3 spatial resolution, improving to (1.8 mm) 3 when point spread function (PSF) modeling algorithms are used. These values are very close to those of dedicated small animal PET cameras such as the Siemens microPET FOCUS 120 (F120). The larger axial and transaxial field of view of the HRRT compared...