Table 1.

Reconstruction parameters for the different scanners used.

Scanner	Voxel Size in mm (x, y, z)	Matrix	Reconstruction	Scatter Correction	Randoms Correction
Philips Gemini TF64	4 × 4 × 4	144 or 169	BLOB-OS-TF	SS-Simul	DLYD
GE Healthcare Discovery 690	3.65 × 3.65 × 3.27	192	VPFX	Model based	Singles
GE Healthcare Discovery 710	3.65 × 3.65 × 3.27	192	VPFX	Model based	Singles
GE Healthcare STE	4.6875 × 4.6875 × 3.27	128	OSEM	Convolution subtraction	Singles

BLOB-OS-TF = an ordered subset iterative TOF reconstruction algorithm using blobs instead of voxels; DLYD = delayed event subtraction; OSEM = ordered subsets expectation maximisation; SS-Simul = single-scatter simulation; VPFX = Vue Point FX (OSEM including point spread function and time of flight).