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Photon-counting CT-derived Quantification of Hepatic Fat Fraction: A Clinical Validation Study
Tatjana Dell1, Narine Mesropyan1, Yannik Layer1
1Department of Diagnostic and Interventional Radiology and Quantitative Imaging Lab Bonn, University Hospital Bonn, Venusberg-Campus 1, 53127 Bonn, Germany.
Radiology
|March 18, 2025
Summary
Photon-counting CT (PCCT) accurately quantifies liver fat fraction, showing excellent agreement with MRI PDFF. This imaging technique shows moderate correlation with biopsy and CAP, offering a promising tool for steatosis screening.
Area of Science:
- Radiology
- Medical Imaging
- Hepatology
Background:
- Non-alcoholic fatty liver disease (NAFLD) is a growing global health concern.
- Opportunistic screening for hepatic steatosis is increasingly important for early detection and management.
- Accurate non-invasive quantification of liver fat is crucial for patient care.
Purpose of the Study:
- To assess the accuracy of liver fat quantification using photon-counting CT (PCCT) on contrast-enhanced scans.
- To validate PCCT fat quantification against histopathology, transient elastography (CAP), and MRI proton density fat fraction (PDFF).
Main Methods:
- Prospective observational study involving 178 participants with suspected or known liver disease.
- Liver fat fraction measured using PCCT with a three-material decomposition algorithm.
- Comparison with histopathology, controlled attenuation parameter (CAP), and MRI PDFF measurements.
- Statistical analysis included Spearman correlation and intraclass correlation coefficient (ICC).
Main Results:
- PCCT demonstrated excellent agreement with MRI PDFF for liver fat fraction (ICC = 0.91).
- Moderate correlation was observed between PCCT and histologic (ρ = 0.65) and CAP (ρ = 0.45) steatosis grades.
- The optimal PCCT fat fraction threshold for steatosis detection was 4.8% (sensitivity 81%, specificity 71%).
Conclusions:
- PCCT provides accurate liver fat fraction estimation in a clinical setting, comparable to MRI PDFF.
- PCCT is a viable tool for non-invasive hepatic steatosis assessment.
- Further validation in diverse patient populations is warranted.
