Clinical Scorecard: Evaluation of Radiomics Approaches and Dual-Energy Material Decomposition for Analyzing Abdominal Lymphoma in Contrast-Enhanced CT Scans

At a Glance

Key Highlights

• Lymph node size and number are primary criteria for suspicion of lymphoma in cross-sectional imaging, but diagnosis remains challenging in borderline cases.
• Dual-energy CT iodine quantification provides non-invasive tissue characterization reflecting tumor vascularity without additional radiation exposure.
• Radiomics extracts high-dimensional quantitative imaging features capturing tissue heterogeneity and shape, potentially improving lymphoma stratification.

Guideline-Based Recommendations

Diagnosis

• Use lymph node size thresholds (>1.5 cm) and number to assess nodal involvement in suspected lymphoma.
• Consider DECT iodine quantification as a non-invasive imaging biomarker to differentiate benign from malignant lymph nodes.
• Apply radiomics features to capture tumor phenotype heterogeneity and support diagnosis when visual assessment is equivocal.

Management

• Employ combined radiomics and DECT features to improve stratification accuracy of abdominal lymphoma on contrast-enhanced CT.
• Restrict PET-CT use due to high radiation and cost; use DECT and radiomics as supportive tools to reduce need for additional imaging.

Monitoring & Follow-up

• Use iodine density and normalized iodine uptake (ID%) from DECT to monitor tumor vascularity and potential treatment response.
• Radiomics features may be useful for longitudinal assessment of tumor heterogeneity and clinical outcomes.

Risks

• High radiation exposure and cost limit PET-CT application; DECT protocols should optimize dose reduction (e.g., tin filter, iterative reconstruction).
• Imaging artifacts and multiple malignancies may confound DECT and radiomics analysis and should be excluded.

Patient & Prescribing Data

72 adult patients with contrast-enhanced abdominal DECT, including lymphoma confirmed by histopathology and controls without abdominal malignancy

Quantitative imaging biomarkers from DECT and radiomics may enable earlier and more accurate lymphoma stratification, potentially guiding timely therapy decisions.

Clinical Best Practices

• Perform contrast-enhanced abdominal DECT with dual-source, dual-energy CT using optimized protocols (100 kV and 150 kV with tin filter) to reduce radiation dose.
• Use iodine subtraction algorithms to calculate iodine density and normalized iodine uptake for lymph node characterization.
• Apply radiomics analysis on single-energy CT images to extract robust, non-redundant features describing lymph node heterogeneity and shape.
• Combine radiomics and DECT features to enhance diagnostic accuracy in differentiating benign from malignant lymph nodes in abdominal lymphoma.
• Exclude patients with multiple malignancies or imaging artifacts to ensure data quality and reliable analysis.

References

• Lymph node size and malignancy probability
• Size thresholds for pathological lymph nodes
• Challenges in lymph node diagnosis without prior CT
• PET-CT limitations in lymphoma imaging
• DECT iodine quantification for tissue characterization
• Radiomics in oncology
• Combined DECT and radiomics for lymph node characterization