Correlation study between DKI and conventional DWI in brain and head and neck tumors |
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| Institution: | 1. Medical Physics Laboratory, Regina Elena National Cancer Institute, Via Elio Chianesi 53, 00144 Rome, Italy;2. Radiology and Diagnostic Imaging Department, Regina Elena National Cancer Institute, Via Elio Chianesi 53, 00144 Rome, Italy;1. Department of Radiology, Division of Neonatology, University of Groningen and University Medical Center Groningen, Hanzeplein 1, 9713 GZ, The Netherlands;2. Department of Pediatrics, Division of Neonatology, University of Groningen and University Medical Center Groningen, Hanzeplein 1, 9713 GZ, The Netherlands;1. Department of Mathematics, University of Bergen, Bergen, Norway;2. Christian Michelsen Research, Bergen, Norway;3. Faculty of Health and Social Sciences, Western Norway University of Applied Sciences, Bergen, Norway;4. Department of Radiology, Haukeland University Hospital, Bergen, Norway;5. Department of Biomedicine, University of Bergen, Bergen, Norway;6. Department of Clinical Engineering, Haukeland University Hospital, Bergen, Norway;7. Department of Clinical Medicine, University of Bergen, Bergen, Norway;8. MedViz Research Cluster, University of Bergen, Bergen, Norway;1. Vanderbilt University Institute of Imaging Science, Nashville, TN, United States;2. Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN, United States;3. Department of Physics and Astronomy, Vanderbilt University, Nashville, TN, United States;4. Department of Medical Physics in Radiology, German Cancer Research Center, Germany;5. Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, United States;6. Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN, United States;1. Department of Diagnostic and Interventional Radiology, University Hospital Tuebingen, 72076 Tübingen, Germany;2. Siemens Healthcare, Erlangen, Germany;3. Siemens Shenzhen Magnetic Resonance Ltd., Shenzhen, China |
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| Abstract: | PurposeTo investigate the relationship between the Diffusion Kurtosis Imaging (DKI) parameters and conventional metrics provided by Diffusion-weighted imaging (DWI) in patients affected by Brain or Head and Neck (HN) cancer.MethodsTen patients affected by brain tumor and nine patients with HN tumor underwent a pre-treatment MR examination at 3 T. The largest tumor section was manually contoured by two expert neuroradiologists. The apparent diffusion coefficient (Dapp) and apparent diffusional kurtosis (Kapp) parameters were determined at the voxel level by using the DKI model, and compared to the apparent diffusion coefficient (ADC) and the tissue diffusion coefficient (Dmono) obtained from mono-exponential fitting methods. The Akaike Information Criteria (AIC) was calculated to assess the quality of the fitting methods. Cross-correlations between all the variables were assessed using the Spearman rank test.ResultsIncreased Kapp values were found in each lesion. All parameters were strongly related, in particular an inverse relationship emerged between median values of Kapp and Dapp/Dmono/ADC in both patient groups, while Dapp showed positive correlations with Dmono and ADC. From the analysis at the voxel level, significant inverse associations were found between Kapp and Dmono within the lesions, while a weak or moderate association emerged between Kapp and ADC or Dapp.ConclusionsA significant association between the apparent diffusional kurtosis Kapp and the tissue diffusion coefficient Dmono emerged for both brain and HN tumors at 3 T, suggesting that both variables may consistently reflect deeper insight into the microstructural characteristics of tumors. |
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