Purpose: To evaluate the feasibility of Na MR fingerprinting (MRF) for simultaneous quantification of T , , , in addition to ΔB .
Methods: A framework for sodium relaxometry using MRF at 7T was developed, allowing simultaneous measurement of relaxation times and inhomogeneities in the static field. The technique distinguishes between bi- and monoexponential transverse relaxation and was validated in simulations with respect to the ground truth. In phantom measurements, a resolution of 2 × 2 × 12 mm was achieved within 1 h acquisition time, and the resulting parameter maps were compared to results from reference methods. Relaxation times in five healthy volunteers were measured with a resolution of 4 × 4 × 12 mm .
Results: Phantom experiments revealed an agreement between the relaxation times obtained via Na-MRF and the reference methods. In white matter, a longitudinal relaxation constant of T = 38.9 ± 4.8 ms was found, while values of = 29.2 ± 4.9 ms and = 4.7 ± 1.2 ms were found for the long and short component of the transverse relaxation. In cerebrospinal fluid, T was 67.7 ± 6.3 ms and = 41.5 ± 3.4 ms.
Conclusion: This work demonstrates the feasibility of Na-MRF for relaxometry in sodium MRI in both phantom and in vivo studies. Simultaneous quantification of T , , , and ΔB was possible within a 1 h measurement time.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/mrm.28316 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Asymptomatic female softball pitchers have altered hip morphology and cartilage composition.
Sci Rep
January 2025
La Trobe Sport & Exercise Medicine Research Centre, School of Allied Health, Human Services and Sport, La Trobe University, Melbourne, VIC, Australia.
Few studies have explored hip morphology and cartilage composition in female athletes or the impact of asymmetric repetitive loading, such as occurs during softball pitching. The current cross-sectional study assessed bilateral bony hip morphology on computed tomography imaging in collegiate-level softball pitchers ('Pitch1', n = 25) and cross-country runners ('Run', n = 13). Magnetic resonance imaging was used to assess cartilage relaxation times in a second cohort of pitchers ('Pitch2', n = 10) and non-athletic controls ('Con', n = 4).
View Article and Find Full Text PDFPrescription of commonly used drugs in patients with functional bowel disorders. A cross-sectional comparison with the general population.
Scand J Gastroenterol
January 2025
Department of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden.
Objectives: Comorbidity with other conditions is common in functional bowel disorders. We aimed to investigate the prescription patterns of commonly used drugs in patients with irritable bowel syndrome (IBS) and functional unspecific bowel disorder, compared to the general population.
Material And Methods: Prescriptions of commonly used drugs in 2022 were compared between patients and the general population from the same age group and region in Sweden.
Kinetics of recovery and normalization of running biomechanics following aerobic-based exercise-induced muscle damage in recreational male runners.
J Sci Med Sport
January 2025
Department of Health Promotion, School of Public Health, Faculty of Medical and Health Sciences, Sylvan Adams Sports Institute, Tel-Aviv University, Israel. Electronic address:
Objectives: The study aimed to examine the effects of exercise-induced muscle damage on running kinetics.
Design: Twenty-six adult recreational male runners performed 60 min of downhill running (-10 %) at 65 % of maximal heart rate. Running gait changes, systemic and localized muscle damage markers were assessed pre - and post-exercise induced muscle damage protocol.
Real-time prediction of heparin concentration in blood extracorporeal circulation by relaxation time distribution (RTD).
Bioelectrochemistry
January 2025
Graduate School of Engineering, Chiba University, 1-33 Yayoi, Inage, Chiba 263-8522 Japan.
Heparin concentration c in a blood extracorporeal circulation has been real-timely predicted based on the relaxation strength Δε at relaxation frequency f extracted by relaxation time distribution (RTD). The simulated extracorporeal circulation was conducted to optimize the number of Δε for the prediction of c using the porcine whole blood (WB) and low-leukocyte and -platelet blood (LLPB) under the condition of the gradual increment of c from 0 to 8 U/mL with constant flow rate and blood temperature. The experimental results show that among the three relaxation strengths Δε, Δε and Δε (in ascending order of frequency), Δε at f = 5.
View Article and Find Full Text PDFRMKD: Relaxed matching knowledge distillation for short-length SSVEP-based brain-computer interfaces.
Neural Netw
January 2025
Institute for Infocomm Research (I2R), Agency for Science, Technology and Research (A*STAR), 138632, Singapore. Electronic address:
Accurate decoding of electroencephalogram (EEG) signals in the shortest possible time is essential for the realization of a high-performance brain-computer interface (BCI) system based on the steady-state visual evoked potential (SSVEP). However, the degradation of decoding performance of short-length EEG signals is often unavoidable due to the reduced information, which hinders the development of BCI systems in real-world applications. In this paper, we propose a relaxed matching knowledge distillation (RMKD) method to transfer both feature-level and logit-level knowledge in a relaxed manner to improve the decoding performance of short-length EEG signals.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!