Abstract
Purpose
To compare the clinical performance of upper abdominal PET/DCE-MRI with and without concurrent respiratory motion correction (MoCo).
Methods
MoCo PET/DCE-MRI of the upper abdomen was acquired in 44 consecutive oncologic patients and compared with non-MoCo PET/MRI. SUVmax and MTV of FDG-avid upper abdominal malignant lesions were assessed on MoCo and non-MoCo PET images. Image quality was compared between MoCo DCE-MRI and non-MoCo CE-MRI, and between fused MoCo PET/MRI and fused non-MoCo PET/MRI images.
Results
MoCo PET resulted in higher SUVmax (10.8 ± 5.45) than non-MoCo PET (9.62 ± 5.42) and lower MTV (35.55 ± 141.95 cm3) than non-MoCo PET (38.11 ± 198.14 cm3; p < 0.005 for both). The quality of MoCo DCE-MRI images (4.73 ± 0.5) was higher than that of non-MoCo CE-MRI images (4.53±0.71; p = 0.037). The quality of fused MoCo-PET/MRI images (4.96 ± 0.16) was higher than that of fused non-MoCo PET/MRI images (4.39 ± 0.66; p < 0.005).
Conclusion
MoCo PET/MRI provided qualitatively better images than non-MoCo PET/MRI, and upper abdominal malignant lesions demonstrated higher SUVmax and lower MTV on MoCo PET/MRI.
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Abbreviations
- MoCo:
-
motion corrected
- PET:
-
positron emission tomography
- MR:
-
magnetic resonance
- DCE:
-
dynamic contrast enhanced
- CE:
-
contrast enhanced
- VIBE:
-
volume interpolated breath-hold examination
- FDG:
-
18Fluorodeoxyglucose
- SUVmax:
-
maximal standard uptake value
- MTV:
-
metabolic tumor volume.
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Acknowledgments
We acknowledge the following individuals for their help with the PET/MRI data acquisition and initial processing (in alphabetical order): Grae Arabasz, Regan Butterfield, Shirley Hsu, Mary O’Hara, and Lawrence White. We gratefully acknowledge the support of NVIDIA Corporation in donating the Tesla K40 and the Titan X Pascal GPUs used for this research.
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The clinical institutional review board approved this study. All procedures were performed in accordance with the principles of the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.
Informed consent
For this type of retrospective study formal consent is not required; however, patients provided written informed consent at the time of PET/MRI for possible usage of their data in subsequent research studies.
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Catalano, O.A., Umutlu, L., Fuin, N. et al. Comparison of the clinical performance of upper abdominal PET/DCE-MRI with and without concurrent respiratory motion correction (MoCo). Eur J Nucl Med Mol Imaging 45, 2147–2154 (2018). https://doi.org/10.1007/s00259-018-4084-2
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DOI: https://doi.org/10.1007/s00259-018-4084-2