ISSN 1305-3825 | E-ISSN 1305-3612
Head and Neck Imaging - Original Article
Is integrated 18F-FDG PET/MRI superior to 18F-FDG PET/CT in the differentiation of incidental tracer uptake in the head and neck area?
1 Department of Diagnostic and Interventional Radiology, Dusseldorf University School of Medicine, Dusseldorf, Germany; Department of Diagnostic and Interventional Radiology and Neuroradiology, Duisburg-Essen University School of Medicine, Essen, Germany  
2 Department of Nuclear Medicine, Duisburg-Essen University School of Medicine, Essen, Germany  
3 Department of Diagnostic and Interventional Radiology, Dusseldorf University School of Medicine, Dusseldorf, Germany.  
4 Department of Diagnostic and Interventional Radiology and Neuroradiology, Duisburg-Essen University School of Medicine, Essen, Germany.  
Diagn Interv Radiol ; : -
DOI: 10.5152/dir.2016.15610
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Abstract

Objective: To investigate the accuracy of 18F-fluordesoxyglucose positron emission tomography/magnetic resonance (18F-FDG PET/MR) imaging in comparison to contrast-enhanced 18F-FDG PET/computed tomography (PET/CT) for the characterization of incidental tracer uptake in examinations of the head and neck.

 

Material & Methods: A retrospective analysis of 81 oncological patients who underwent contrast-enhanced 18F-FDG PET/CT and subsequent PET/MR was performed by two readers for incidental tracer uptake. In a consensus reading, discrepancies were resolved. Each finding was either characterized as most likely benign, most likely malignant, or indeterminate. Using all available clinical information including results from histopathological sampling and follow-up examinations, an expert reading classified each finding as benign or malignant. McNemar's test was used to compare the performance of both imaging modalities in characterizing incidental tracer uptake.

 

Results: Forty-six lesions were detected in both modalities. While 27 lesions were classified as most likely benign, one was classified as most likely malignant and 18 were classified in as indeterminate in PET/CT, 31 lesions were classified as most likely benign, one lesion was classified as most likely malignant and 14 were classified as indeterminate in PET/MR. Forty-three lesions were benign and one lesion was malignant according to the reference standard. In two lesions, a definite diagnosis was not possible. McNemar's test detected no differences concerning the correct classification of incidental tracer uptake between PET/CT and PET/MRI (p=0.125).

 

Conclusion: In examinations of the head and neck area, incidental tracer uptake can not be classified more accurately by PET/MR than by PET/CT.

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