NEMA evaluation of the first and second generation of the Ecat Exact and Ecat Exact HR family of scanners

The first and second generation of Exact and Exact HR family of scanners has been evaluated in terms of NEC and count rate capabilities. The new NEMA standard was used for the evaluation. In spite of improved electronics and improved count rate capabilities, the peak NEC was found to be fairly constant between the generations. The results are discussed in terms of the different electronic solutions for the two generations and its implications on system dead time and NEC count rate capability.