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Table 1 PET system characteristics for mCT (PET/CT) and mMRI (PET/MRI) system

From: Comparison of PET/CT and PET/MR imaging and dosimetry of yttrium-90 (90Y) in patients with unresectable hepatic tumors who have received intra-arterial radioembolization therapy with 90Y microspheres

 

mCT

mMR

Crystal material

LSO

LSO

Crystal element dimension

4 × 4 × 20 mm

4 × 4 × 20 mm

Detector ring diameter

780 mm

656 mm

Transaxial FoV

680 mm

588 mm

Axial FoV

216 mm

258 mm

Coincidence window

4.1 ns

4.1 ns

System energy resolution

≤ 12% FWHM

≤ 14% FWHM

System time resolution

540 ps typical

N/A (no TOF system)

Sensitivity (cps/kBq)

10.2

14.1

Spatial resolution—transverse

FWHM at 1 cm (mm) 4.5

FWHM at 1 cm (mm) 4.2

Spatial resolution—axial

FWHM at 1 cm (mm) 4.7

FWHM at 1 cm (mm) 4.6

Peak NEC rate (kcps)

180 at ≤ 28 kBq/cc

180 at ≤ 26 kBq/cc

Scatter fraction (at peak NEC rate)

37%

38%

Reconstruction parameters

PSF-TOF-OSEM 2i21s

PSF-OSEM 3i21s