TABLE 1

Selected Data from Collimator Specifications (23)

	Holes
Collimator type	Shape	Diameter (mm)^*	Length (mm)	Septal thickness (mm)	Geometric resolution at 10 cm (mm)	p in mm (Eq. 1)^†	Septal penetration at 511 keV (Eq. 2)^†
LEHR	Hexagonal	1.11	24.05	0.16	6.4	1.6	76%
MELP	Hexagonal	2.94	40.64	1.14	10.8	6.6	33%
HE	Hexagonal	4	59.7	2	13.2	11.9	13%
UHE	Hexagonal	2.5	50.5	3.4	10.6	20.4	3.2%

↵* Diameter of hexagonal hole indicates distance between 2 parallel sides.
↵† Data are calculated values for minimum path length p (Eq. 1) and septal penetration at 511 keV (Eq. 2).