LAUSR

Background Challenges to cardiac PET-CT include patient motion, prolonged image acquisition and a reduction of counts due to gating. We compared two analytical tools, FusionQuant and OsiriX, for quantification of gated cardiac 18F-sodium fluoride (18F-fluoride) PET-CT imaging. Methods Twenty-seven patients with aortic stenosis were included, 15 of whom underwent repeated imaging 4 weeks apart. Agreement between analytical tools and scan-rescan reproducibility was determined using the Bland–Altman method and Lin’s concordance correlation coefficients (CCC). Results Image analysis was faster with FusionQuant [median time (IQR) 7:10 (6:40-8:20) minutes] compared with OsiriX [8:30 (8:00-10:10) minutes, p  = .002]. Agreement of uptake measurements between programs was excellent, CCC = 0.972 (95% CI 0.949-0.995) for mean tissue-to-background ratio (TBR mean ) and 0.981 (95% CI 0.965-0.997) for maximum tissue-to-background ratio (TBR max ). Mean noise decreased from 11.7% in the diastolic gate to 6.7% in motion-corrected images ( p  = .002); SNR increased from 25.41 to 41.13 ( p  = .0001). Aortic valve scan-rescan reproducibility for TBR max was improved with FusionQuant using motion correction compared to OsiriX (error ± 36% vs ± 13%, p  < .001) while reproducibility for TBR mean was similar (± 10% vs ± 8% p  = .252). Conclusion 18F-fluoride PET quantification with FusionQuant and OsiriX is comparable. FusionQuant with motion correction offers advantages with respect to analysis time and reproducibility of TBR max values.