Table 2.

Some relevant available collimator specifications according to the vendor for the Philips Precedence single-photon emission computed tomography combined with computed tomography

Collimator name	Planar resolution, mm at 10 cm	Tc-99m sensitivity (cps/MBq)	Septal thickness (mm)	Septal penetration (%)	Photon energy (keV)
MEGP	11.3	98	1.143	3.3	300
LEGP	8.8	119	0.180	1.9	140
LEHR	7.4	66	0.152	1.3	140

Parameters are defined according to NEMA NU 1-2012.

LEGP, low energy general purpose; LEHR, low energy high resolution; MEGP, medium energy general purpose.