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Repeatability, Reproducibility, and Observer Variability of Cortical T1 Mapping for Renal Tissue Characterization
Magdalena Nowak1, Markus Henningsson1, Tom Davis1
1Perspectum Ltd, Oxford, UK.
Journal of Magnetic Resonance Imaging : JMRI
|October 29, 2024
Summary
Kidney cortical T1 mapping is a reliable MRI technique for assessing kidney health. This study confirms its high repeatability and reproducibility across different scanners and observers.
Area of Science:
- Medical Imaging
- Nephrology
- Biomarker Development
Background:
- Growing prevalence of kidney diseases necessitates noninvasive imaging biomarkers.
- Renal cortical T1 mapping shows potential but requires further technical validation.
Purpose of the Study:
- Evaluate repeatability, reproducibility, and observer variability of kidney cortical T1 mapping.
- Assess the technique in healthy human volunteers.
Main Methods:
- Prospective study involving three cohorts of healthy volunteers.
- Utilized modified Look-Locker imaging (MOLLI) with bSSFP readout on 1.5T and 3T MRI scanners.
- Statistical analyses included Bland Altman, coefficient of variation (CoV), intra-class coefficient (ICC), and repeatability coefficient (RC).
Main Results:
- High repeatability across scanner field strengths and manufacturers (CoV 1.9%-2.8%, ICC 0.79-0.88).
- Good reproducibility between scanners (CoV 3.0%, ICC 0.75).
- Robust observer variability with minimal impact (CoV 0.6%-1.4%, ICC 0.93-0.98).
Conclusions:
- Kidney cortical T1 mapping is a highly repeatable and reproducible MRI method.
- The technique demonstrates reliability across different MRI manufacturers, field strengths, and observers.
- Supports its use as a noninvasive biomarker for kidney diseases.
