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Diagnostic Value of Dual-Energy CT Iodine Mapping in Differentiating Malignant and Benign Cervical Lymphadenopathies
Mustafa Başaran1, Fatma Beyazal Çeliker2, Metin Çeliker3
1Department of Radiology, Faculty of Medicine, Samsun University, Samsun, Turkey.
Insights
Dual-Energy Computed Tomography (DECT) iodine quantification helps detect cervical lymph node metastases in neck cancer. Combining iodine levels with tumor type improves diagnostic accuracy for better prognosis and treatment planning.
Area of Science:
- Radiology
- Oncology
- Medical Imaging
Background:
- Cervical lymph node metastasis is a critical factor in neck carcinoma prognosis.
- Accurate differentiation between malignant and benign lymph nodes is essential for effective treatment planning.
Purpose of the Study:
- To assess the diagnostic accuracy of Dual-Energy Computed Tomography (DECT) in differentiating malignant from benign cervical lymph nodes in neck carcinoma.
- To evaluate the utility of iodine concentration and normalized spectral attenuation (Hounsfield Unit, HU) values derived from DECT for this distinction.
Main Methods:
- Retrospective analysis of DECT scans from 52 neck carcinoma patients, including 52 metastatic and 28 reactive lymph nodes.
- Measurement of iodine concentration (mg/mL) and spectral HU values using regions of interest on iodine maps.
- Categorization of metastatic nodes by primary tumor type: squamous cell carcinoma (SCC), lymphoma, and papillary thyroid carcinoma (PTC).
Main Results:
- Metastatic lymph nodes exhibited significantly lower iodine concentrations (1.45 mg/mL) compared to reactive nodes (1.85 mg/mL) (p=0.011).
- No significant difference was observed in spectral HU values between metastatic and reactive nodes (117 vs. 111 HU, p=0.328).
- An iodine threshold of 1.62 mg/mL achieved 71% sensitivity and 77% specificity for malignancy detection (AUC=0.673).
- SCC metastases showed lower iodine levels than reactive nodes (1.33 vs. 1.85 mg/mL), while PTC metastases had higher levels (2.39 vs. 1.85 mg/mL).
Conclusions:
- DECT-based iodine quantification enhances the detection of cervical lymph node metastases, especially when size criteria are equivocal.
- Integrating iodine concentration data with knowledge of tumor type improves diagnostic accuracy.
- This approach aids in refining patient prognosis and optimizing treatment strategies for neck carcinoma.
Purpose:
To evaluate the diagnostic accuracy of Dual-Energy Computed Tomography (DECT) in distinguishing malignant from benign cervical lymph nodes in neck carcinoma based on iodine concentration and normalized spectral attenuation (Hounsfield Unit, HU) values.
Methods:
Retrospective DECT scan analysis was performed on 52 neck carcinoma patients, analyzing 52 metastatic and 28 reactive lymph nodes. Iodine concentration (mg/mL) and spectral HU values were measured with circular regions of interest on iodine maps. Metastatic nodes included 27 from squamous cell carcinoma (SCC), 19 from lymphoma, and 6 from papillary thyroid carcinoma (PTC).
Results:
Metastatic lymph nodes had lower iodine levels than reactive nodes (1.45 vs. 1.85 mg/mL, p = 0.011). No significant difference in spectral HU values was found (117 vs. 111 HU, p = 0.328). An iodine threshold of 1.62 mg/mL demonstrated 71% sensitivity and 77% specificity for detecting malignancy (AUC = 0.673, 95% CI: 0.54-0.80, p = 0.011). SCC metastases had lower iodine levels than reactive nodes (1.33 vs. 1.85 mg/mL, p < 0.001), while PTC metastases had higher levels (2.39 vs. 1.85 mg/mL, p = 0.038).
Conclusion:
DECT iodine quantification improves the detection of cervical lymph node metastases, particularly in cases with equivocal size criteria. Incorporating iodine measurements with tumor type knowledge improves diagnostic accuracy, aiding in prognosis and treatment planning.
