Table 1.

List of variables and parameters used in the model.

Variable/parameter	Description	Ref.
nc	# cancer patients who require PET-CT service in country c
Ic	Cancer incidence in country c	[5]
qc	# cancer patients who have access to PET-CT services in country c
f	Estimated fraction of Ic who require PET-CT services. For the six cancers, f=0.66	[4]
PETac	# of available PET-CT scanners in country c	[1]
α	α=sc*ef*pcs=1,790
sc	Average number of PET-CT scans performed=2,340 times/PET-CT unit/year	[6]
ef	Scheduling efficiency of PET-CT unit=0.9	[6]
psc	Proportion of PET-CT scans attributable to cancer=0.85	[7]