Improved T*₂ determination in 23Na, 35Cl, and 17O MRI using iterative partial volume correction based on 1H MRI segmentation
Niesporek SC, Umathum R, Fiedler TM, Bachert P, Ladd ME, Nagel AM (2017)
Publication Type: Journal article
Publication year: 2017
Journal
Book Volume: 30
Pages Range: 519-536
Journal Issue: 6
DOI: 10.1007/s10334-017-0623-2
Abstract
OBJECTIVE: Functional parameters can be measured with the help of quantitative non-proton MRI where exact relaxometry parameters are needed. Investigation of [Formula: see text] is often biased by strong partial volume (PV) effects. Hence, in this work a PV correction algorithm approach was evaluated that uses iteratively adapted [Formula: see text]-values and high-resolution structural 1H data to determine transverse relaxation in non-proton MRI more accurately. MATERIALS AND METHODS: Simulations, a phantom study and in vivo 23Na, 17O and 35Cl MRI measurements of five healthy volunteers were performed to evaluate the algorithm. [Formula: see text] values of grey matter (GM), white matter (WM) and cerebrospinal fluid (CSF) were obtained. Data were acquired at B 0 = 7T with nominal spatial resolutions of (4-7 mm)3 using a density-adapted radial sequence. The resulting transverse relaxation times were used for quantification of 17O data. RESULTS: The conducted simulations and phantom study verified the correction performance of the algorithm. For in vivo measured [Formula: see text] values, the correction of PV effects leads to an increase in CSF and to a decrease in GM/WM (23Na MRI: long/short GM, WM [Formula: see text]: 36.4 ± 3.1/5.4 ± 0.2, 23.3 ± 2.6/3.5 ± 0.1 ms; 35Cl MRI: 8.9 ± 1.4/1.0 ± 0.4, 5.9 ± 0.3/0.4 ± 0.1 ms; 17O MRI: 2.5 ± 0.1, 2.8 ± 0.1 ms). Iteratively corrected in vivo [Formula: see text] values of the 17O study resulted in improved water content quantification. CONCLUSION: The proposed iterative algorithm for PV correction leads to more accurate [Formula: see text] values and, thus, can improve accuracy in quantitative non-proton MRI.
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APA:
Niesporek, S.C., Umathum, R., Fiedler, T.M., Bachert, P., Ladd, M.E., & Nagel, A.M. (2017). Improved T*₂ determination in 23Na, 35Cl, and 17O MRI using iterative partial volume correction based on 1H MRI segmentation. Magnetic Resonance Materials in Physics Biology and Medicine, 30(6), 519-536. https://doi.org/10.1007/s10334-017-0623-2
MLA:
Niesporek, Sebastian C., et al. "Improved T*₂ determination in 23Na, 35Cl, and 17O MRI using iterative partial volume correction based on 1H MRI segmentation." Magnetic Resonance Materials in Physics Biology and Medicine 30.6 (2017): 519-536.
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