Evaluation of the PET component of simultaneous [18F]choline PET/MRI in prostate cancer: comparison with [18F]choline PET/CT |
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Authors: | Axel Wetter Christine Lipponer Felix Nensa Philipp Heusch Herbert Rübben Jens-Christian Altenbernd Thomas Schlosser Andreas Bockisch Thorsten Pöppel Thomas Lauenstein James Nagarajah |
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Affiliation: | 1. Department of diagnostic and interventional Radiology and Neuroradiology, University Hospital Essen, Essen, Germany 2. Department of diagnostic and interventional Radiology, University Dusseldorf, Medical Faculty, Dusseldorf, Germany 3. Department of Urology and pediatric Urology, University Hospital Essen, Essen, Germany 4. Department of Nuclear Medicine, University Hospital Essen, Essen, Germany
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Abstract: | Purpose The aim of this study was to evaluate the positron emission tomography (PET) component of [18F]choline PET/MRI and compare it with the PET component of [18F]choline PET/CT in patients with histologically proven prostate cancer and suspected recurrent prostate cancer. Methods Thirty-six patients were examined with simultaneous [18F]choline PET/MRI following combined [18F]choline PET/CT. Fifty-eight PET-positive lesions in PET/CT and PET/MRI were evaluated by measuring the maximum and mean standardized uptake values (SUVmax and SUVmean) using volume of interest (VOI) analysis. A scoring system was applied to determine the quality of the PET images of both PET/CT and PET/MRI. Agreement between PET/CT and PET/MRI regarding SUVmax and SUVmean was tested using Pearson’s product-moment correlation and Bland-Altman analysis. Results All PET-positive lesions that were visible on PET/CT were also detectable on PET/MRI. The quality of the PET images was comparable in both groups. Median SUVmax and SUVmean of all lesions were significantly lower in PET/MRI than in PET/CT (5.2 vs 6.1, p?0.05 and 2.0 vs 2.6, p?0.001, respectively). Pearson’s product-moment correlation indicated highly significant correlations between SUVmax of PET/CT and PET/MRI (R?=?0.86, p?0.001) as well as between SUVmean of PET/CT and PET/MRI (R?=?0.81, p?0.001). Bland-Altman analysis revealed lower and upper limits of agreement of ?2.77 to 3.64 between SUVmax of PET/CT vs PET/MRI and ?1.12 to +2.23 between SUVmean of PET/CT vs PET/MRI. Conclusion PET image quality of PET/MRI was comparable to that of PET/CT. A highly significant correlation between SUVmax and SUVmean was found. Both SUVmax and SUVmean were significantly lower in [18F]choline PET/MRI than in [18F]choline PET/CT. Differences of SUVmax and SUVmean might be caused by different techniques of attenuation correction. Furthermore, differences in biodistribution and biokinetics of [18F]choline between the subsequent examinations and in the respective organ systems have to be taken into account. |
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