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Examiner repeatability of patellar cartilage T2 values
Matthew F Koff1, Sebastien Parratte, Kimberly K Amrami
1Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN 55901, USA.
Magnetic Resonance Imaging
|September 20, 2008
Summary
Assessing patellar cartilage T2 mapping, this study found that while intraexaminer precision for T2 values was good, interexaminer variability was higher, impacting interpretation of results.
Area of Science:
- Biomedical Imaging
- Orthopedics
- Radiology
Background:
- T2 mapping is a quantitative MRI technique used to assess cartilage composition.
- Patellar cartilage health is crucial for knee function, and accurate assessment is vital.
Purpose of the Study:
- To evaluate the precision of patellar cartilage T2 mapping measurements between and within examiners.
- To determine the reliability of T2 values for assessing cartilage health in healthy subjects.
Main Methods:
- T2-weighted MRI of patellar cartilage was performed on 10 healthy subjects.
- Manual segmentation of cartilage was conducted twice by two examiners on separate days.
- Bulk average and zonal T2 values (superficial, middle, deep) were calculated and analyzed for variability using RMS error and COV.
Main Results:
- Intraexaminer bulk T2 differences showed low variability (RMS error 0.7 ms, COV 1.9%).
- Interexaminer bulk T2 differences exhibited higher variability (RMS error 1.2 ms, COV 3.3%).
- The superficial cartilage zone demonstrated the greatest zonal variability in T2 values.
Conclusions:
- Interexaminer variability in T2 values complicates the interpretation of subtle differences in patellar cartilage.
- Repeatability of patellar cartilage T2 measurements was found to be better than reported intersession variability.
