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[Qualitative control over quantitative MR tomography: in vitro and in vivo checks on relaxation time measurements]
Abstract:
In-vivo and in-vitro checks on measurements of relaxation times in MRI have been carried out as part of quality control. For the in-vitro experiments we used 13 reagents consisting of varying concentrations of copper sulphate manganese sulphate, gadolinium solutions and various oils as well as water. For in-vivo measurements we used liver parenchyma and fat in three subjects. Eight different sequences were performed; intra- and interindividual variations and comparison of three similar MRI units showed average variations of 2-3% for T1 and 3-4% variations for T2 relaxation times. This margin of error makes quantitative MRI acceptable for clinical use.
Insights
Quality control for magnetic resonance imaging (MRI) assessed relaxation times using in-vivo and in-vitro methods. Results show acceptable variations for quantitative MRI in clinical settings.
Area of Science:
- Medical Physics
- Radiology
- Biomedical Engineering
Background:
- Accurate measurement of relaxation times (T1 and T2) is crucial for quantitative magnetic resonance imaging (MRI).
- Establishing quality control measures is essential to ensure the reliability and clinical applicability of MRI-derived quantitative data.
Purpose of the Study:
- To perform in-vivo and in-vitro quality control checks on MRI relaxation time measurements.
- To evaluate the variability of T1 and T2 relaxation time measurements across different conditions and MRI units.
Main Methods:
- In-vitro experiments utilized 13 reagents, including solutions of copper sulphate, manganese sulphate, gadolinium, oils, and water, with varying concentrations.
- In-vivo measurements were conducted on liver parenchyma and fat in three human subjects.
- Eight different MRI sequences were employed, and intra- and inter-individual variations were assessed across three similar MRI units.
Main Results:
- Average variations for T1 relaxation times were found to be 2-3%.
- Average variations for T2 relaxation times were found to be 3-4%.
- These variations were observed during intra- and inter-individual assessments and across different MRI units.
Conclusions:
- The observed margins of error (2-3% for T1, 3-4% for T2) are within acceptable limits for clinical use.
- Quantitative MRI, with these established quality control parameters, is deemed acceptable for clinical applications.