Abstract
Purpose
The goal of this study is to evaluate the diagnostic performance of simultaneous FDG-PET/MR including diffusion compared to FDG-PET/CT in patients with lymphoma.
Methods
Eighteen patients with a confirmed diagnosis of non-Hodgkin’s (NHL) or Hodgkin’s lymphoma (HL) underwent an IRB-approved, single-injection/dual-imaging protocol consisting of a clinical FDG-PET/CT and subsequent FDG-PET/MR scan. PET images from both modalities were reconstructed iteratively. Attenuation correction was performed using low-dose CT data for PET/CT and Dixon-MR sequences for PET/MR. Diffusion-weighted imaging was performed. SUVmax was measured and compared between modalities and the apparent diffusion coefficient (ADC) using ROI analysis by an experienced radiologist using OsiriX. Strength of correlation between variables was measured using the Pearson correlation coefficient (r p).
Results
Of the 18 patients included in this study, 5 had HL and 13 had NHL. The median age was 51 ± 14.8 years. Sixty-five FDG-avid lesions were identified. All FDG-avid lesions were visible with comparable contrast, and therefore initial and follow-up staging was identical between both examinations. SUVmax from FDG-PET/MR [(mean ± sem) (21.3 ± 2.07)] vs. FDG-PET/CT (mean 23.2 ± 2.8) demonstrated a strongly positive correlation [r s = 0.95 (0.94, 0.99); p < 0.0001]. There was no correlation found between ADCmin and SUVmax from FDG-PET/MR [r = 0.17(−0.07, 0.66); p = 0.09].
Conclusion
FDG-PET/MR offers an equivalent whole-body staging examination as compared with PET/CT with an improved radiation safety profile in lymphoma patients. Correlation of ADC to SUVmax was weak, understating their lack of equivalence, but not undermining their potential synergy and differing importance.
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Acknowledgments
The authors would like to thank the Martinos Center for Biomedical Imaging, and in specific Lawrence White and Mary Foley for the assistance in performing the clinical trial.
Funding
This study was funded through an internal funding mechanism.
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Conflicts of interest
Bruce R. Rosen: Siemens Consultant; Alexander R. Guimaraes: Siemens Speakers’ Bureau, Expert Witness; Wendy Atkinson, Ciprian Catana, Jeremy Abramson, Grae Arabasz, Shanaugh McDermott, Onofrio Catalano, Victorine Muse, Michael A Blake, Jeffrey Barnes, Martin Shelly, and Ephraim Hochberg have nothing to declare.
Ethical approval
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Informed consent was obtained from all individual participants included in the study.
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Atkinson, W., Catana, C., Abramson, J.S. et al. Hybrid FDG-PET/MR compared to FDG-PET/CT in adult lymphoma patients. Abdom Radiol 41, 1338–1348 (2016). https://doi.org/10.1007/s00261-016-0638-6
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DOI: https://doi.org/10.1007/s00261-016-0638-6