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Noninvasive MRI-Based Liver Iron Quantification: Methodic Approaches, Practical Applicability and Significance
A P Wunderlich1, H Cario2, M S Juchems3
1Section for Experimental Radiology, Universitätsklinikum Ulm, Germany.
Abstract:
Due to the dependence of transverse relaxation times T2 and T2* on tissue iron content, MRI offers different options for the determination of iron concentration. These are the time-consuming spin-echo sequence as well as the gradient-echo sequence. For the latter, several data analysis approaches have been proposed, with different requirements for acquisition and post-processing: the mathematically challenging R2* analysis and the signal-intensity ratio method with its high demand on the signal homogeneity of MR images. Furthermore, special procedures currently under evaluation are presented as future prospects: quantitative susceptibility imaging, as a third approach for analyzing gradient echo data, and multi-contrast spin-echo using repeated refocusing pulses. MR theory, as far as needed for understanding the methods, is briefly depicted. Key points: • Description of underlying technology of different MRI-based procedures for liver iron quantification• Applicability of these methods in clinical practice• Validity of the methods, i. e. positive and negative predictive value, if available Citation Format: • Wunderlich AP, Cario H, Juchems MS et al. Noninvasive MRI-Based Liver Iron Quantification: Methodic Approaches, Practical Applicability and Significance. Fortschr Röntgenstr 2016; 188: 1031 - 1036.
Insights
Magnetic Resonance Imaging (MRI) provides noninvasive methods for liver iron quantification by analyzing transverse relaxation times. These techniques, including spin-echo and gradient-echo sequences, offer varying applicability and validity for clinical use.
Area of Science:
- Medical Imaging
- Biophysics
Background:
- Liver iron concentration significantly impacts transverse relaxation times (T2 and T2*).
- MRI offers noninvasive methods for determining tissue iron concentration based on these relaxation times.
Purpose of the Study:
- To describe the underlying technology of different MRI-based liver iron quantification procedures.
- To evaluate the clinical applicability and validity of these methods.
Main Methods:
- Comparison of spin-echo and gradient-echo sequences for liver iron quantification.
- Discussion of data analysis approaches including R2* analysis and signal-intensity ratio method.
- Presentation of emerging techniques like quantitative susceptibility imaging and multi-contrast spin-echo.
Main Results:
- Spin-echo and gradient-echo sequences are primary MRI methods for liver iron quantification.
- Different analysis methods (R2*, signal-intensity ratio) have distinct acquisition and post-processing requirements.
- Novel techniques are under evaluation for improved accuracy and applicability.
Conclusions:
- MRI provides diverse, noninvasive approaches for liver iron quantification.
- Clinical applicability and validity vary among different MRI techniques.
- Ongoing research focuses on refining existing and developing new methods for more accurate iron assessment.
