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http://dx.doi.org/10.7314/APJCP.2014.15.11.4629

Diagnostic Performance of Diffusion Weighted Imaging of Malignant and Benign Pulmonary Nodules and Masses: Comparison with Positron Emission Tomography  

Usuda, Katsuo (Department of Thoracic Surgery, Kanazawa Medical University)
Sagawa, Motoyasu (Department of Thoracic Surgery, Kanazawa Medical University)
Motono, Nozomu (Department of Thoracic Surgery, Kanazawa Medical University)
Ueno, Masakatsu (Department of Thoracic Surgery, Kanazawa Medical University)
Tanaka, Makoto (Department of Thoracic Surgery, Kanazawa Medical University)
Machida, Yuichiro (Department of Thoracic Surgery, Kanazawa Medical University)
Maeda, Sumiko (Department of Thoracic Surgery, Kanazawa Medical University)
Matoba, Munetaka (Department of Radiology, Kanazawa Medical University)
Kuginuki, Yasuaki (Department of Radiology, Kanazawa Medical University)
Taniguchi, Mitsuru (Department of Radiology, Kanazawa Medical University)
Tonami, Hisao (Department of Radiology, Kanazawa Medical University)
Ueda, Yoshimichi (Department of Radiology, Kanazawa Medical University)
Sakuma, Tsutomu (Department of Thoracic Surgery, Kanazawa Medical University)
Publication Information
Asian Pacific Journal of Cancer Prevention / v.15, no.11, 2014 , pp. 4629-4635 More about this Journal
Abstract
Background: Diffusion-weighted imaging (DWI) makes it possible to detect malignant tumors based on the diffusion of water molecules. However, it is uncertain whether DWI has advantages over FDG-PET for distinguishing malignant from benign pulmonary nodules and masses. Materials and Methods: One hundred-forty-three lung cancers, 17 metastatic lung tumors, and 29 benign pulmonary nodules and masses were assessed in this study. DWI and FDG-PET were performed. Results: The apparent diffusion coefficient (ADC) value ($1.27{\pm}0.35{\times}10^{-3}mm^2/sec$) of malignant pulmonary nodules and masses was significantly lower than that ($1.66{\pm}0.58{\times}10^{-3}mm^2/sec$) of benign pulmonary nodules and masses. The maximum standardized uptake value (SUVmax: $7.47{\pm}6.10$) of malignant pulmonary nodules and masses were also significantly higher than that ($3.89{\pm}4.04$) of benign nodules and masses. By using optimal cutoff values for ADC ($1.44{\times}10^{-3}mm^2/sec$) and for SUVmax (3.43), which were determined with receiver operating characteristics curves (ROC curves), the sensitivity (80.0%) of DWI was significantly higher than that (70.0%) of FDG-PET. The specificity (65.5%) of DWI was equal to that (65.5%) of FDG-PET. The accuracy (77.8%) of DWI was not significantly higher than that (69.3%) of FDG-PET for pulmonary nodules and masses. As the percentage of bronchioloalveolar carcinoma (BAC) component in adenocarcinoma increased, the sensitivity of FDG-PET decreased. DWI could not help in the diagnosis of mucinous adenocarcinomas as malignant, and FDG-PET could help in the correct diagnosis of 5 out of 6 mucinous adenocarcinomas as malignant. Conclusions: DWI has higher potential than PET in assessing pulmonary nodules and masses. Both diagnostic approaches have their specific strengths and weaknesses which are determined by the underlying pathology of pulmonary nodules and masses.
Keywords
Diffusion weighted imaging; positron emission tomography; lung cancer; pulmonary nodules and masses;
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