Clinical Scorecard: Employing Fully-Automated 3D Organ Segmentation for Assessing Hepatic Steatosis Using CT Attenuation Metrics

At a Glance

Key Highlights

• Liver biopsy is gold standard but invasive; non-invasive imaging (MRI-PDFF, MRS) preferred for hepatic steatosis quantification
• CT attenuation values inversely correlate with hepatic fat content; ROI-based CT measurements have moderate accuracy (AUC ~0.7–0.9)
• Fully automated 3D organ segmentation allows volumetric CT attenuation measurement, potentially improving assessment of uneven steatosis

Guideline-Based Recommendations

Diagnosis

• Use MRI-PDFF or MRS as non-invasive reference standards for hepatic steatosis quantification
• CT can be used opportunistically for hepatic steatosis screening, preferably with pre-contrast images
• Manual ROI-based CT attenuation measurements involve multiple liver regions and spleen for comparison

Management

• Employ non-invasive imaging techniques for routine and repeated hepatic steatosis monitoring
• Consider volumetric CT attenuation measurements via automated 3D segmentation to improve assessment accuracy

Monitoring & Follow-up

• Monitor hepatic steatosis progression or improvement using MRI-PDFF or MRS as reference
• CT attenuation values can be tracked over time, noting limitations in mild steatosis detection

Risks

• CT involves ionizing radiation exposure; use judiciously especially for repeated assessments
• Post-contrast CT can be used but pre-contrast CT preferred for attenuation measurements
• ROI-based CT measurements may be less representative in heterogeneous steatosis

Patient & Prescribing Data

Adults evaluated for hepatic steatosis, including potential living liver donors

Non-invasive imaging preferred over biopsy; automated volumetric CT attenuation measurement may enhance screening and monitoring

Clinical Best Practices

• Use MRI-PDFF or MRS as non-invasive gold standards for hepatic fat quantification
• Perform CT attenuation measurements on pre-contrast images when possible
• Apply fully automated 3D organ segmentation for volumetric liver and spleen attenuation measurements to improve accuracy
• Place multiple ROIs in different liver segments and spleen for manual CT attenuation assessment
• Avoid large vessels, bile ducts, and liver edges when positioning spectroscopy voxels or ROIs

References

• Liver biopsy as gold standard for hepatic steatosis
• MRI-PDFF and MRS as non-invasive reference standards
• Validation of MRI-PDFF correlation with MRS and histology
• CT attenuation values and hepatic steatosis assessment
• Automated 3D organ segmentation for volumetric CT attenuation