Combined imaging of potassium and sodium in human skeletal muscle tissue at 7 T
| Autor: | Bernhard Hensel, Christoph W. Kopp, Matthias Utzschneider, Lena V. Gast, Tobias Wilferth, Armin M. Nagel, Peter Linz, Max Müller, Stefanie Völker, Michael Uder |
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| Rok vydání: | 2020 |
| Předmět: |
Muscle tissue
Reproducibility Chemistry Potassium Coefficient of variation Sodium Healthy subjects Reproducibility of Results chemistry.chemical_element Magnetic Resonance Imaging 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine medicine.anatomical_structure Nuclear magnetic resonance medicine Skeletal Muscle Tissue Sodium MRI Humans Radiology Nuclear Medicine and imaging Muscle Skeletal 030217 neurology & neurosurgery |
| Zdroj: | Magnetic Resonance in Medicine. 85:239-253 |
| ISSN: | 1522-2594 0740-3194 |
| DOI: | 10.1002/mrm.28428 |
| Popis: | Purpose To validate the feasibility of quantitative combined potassium (39 K) and sodium (23 Na) MRI in human calf muscle tissue, as well as to evaluate the reproducibility of the apparent tissue potassium concentration (aTPC) and apparent tissue sodium concentration (aTSC) determination in healthy muscle tissue. Methods Quantitative 23 Na and 39 K MRI acquisition protocols were implemented on a 7 T MR system. A double-resonant 23 Na/39 K birdcage RF coil was used. Measurements of human lower leg were performed in a total acquisition time of TANa = 10:54 min/TAK = 8:06 min and using a nominal spatial resolution of 2.5 × 2.5 × 15 mm3 /7.5 × 7.5 × 30 mm3 for 23 Na/39 K MRI. Two aTSC and aTPC examinations in muscle tissue were performed during the same day on 10 healthy subjects. Results The proposed acquisition and postprocessing workflow for 23 Na and 39 K MRI data sets provided reproducible aTSC and aTPC measurements. In human calf muscle tissue, the coefficient of variation between scan and re-scan was 5.7% for both aTSC and aTPC determination. Overall, mean values of aTSC = (17 ± 1) mM and aTPC = (85 ± 5) mM were measured. Moreover, for 39 K in calf muscle tissue, T 2 ∗ components of T 2 f ∗ = (1.2 ± 0.2) ms and T 2 s ∗ = (7.9 ± 0.9) ms, as well as a residual quadrupolar interaction of ω q ¯ = (143 ± 17) Hz, were determined. The fraction of the fast component was f = (58 ± 4)%. Conclusion Using the presented measurement and postprocessing approach, a reproducible aTSC and aTPC determination using 23 Na and 39 K MRI at 7 T in human skeletal muscle tissue is feasible in clinically acceptable acquisition durations. |
| Databáze: | OpenAIRE |
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