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Noninvasively assessing tissue potassium concentrations (TPCs) using potassium magnetic resonance imaging ( K MRI) could give valuable information on physiological processes connected to various pathologies. However, because of inherently low K MR image resolution and strong signal blurring, a reliable measurement of the TPC is challenging. The aim of this work was to investigate the feasibility of a muscle-specific TPC determination with a focus on the influence of a varying residual quadrupolar interaction in human lower leg muscles. The quantification accuracy of a muscle-specific TPC determination was first assessed using simulated K MRI data. In vivo K and corresponding sodium ( Na) MRI data of healthy lower leg muscles (n = 14, seven females) were acquired on a 7-T MR system using a double-resonant Na/ K birdcage Tx/Rx RF coil. Additional H MR images were acquired on a 3-T MR system and used for tissue segmentation. Quantification of TPC was performed after a region-based partial volume correction (PVC) using five external reference phantoms. Simulations not only underlined the importance of PVC for correctly assessing muscle-specific TPC values, but also revealed the strong impact of a varying residual quadrupolar interaction between different muscle regions on the measured TPC. Using K T decay curves, we found significantly higher residual quadrupolar interaction in tibialis anterior muscle (TA; ω = 194 ± 28 Hz) compared with gastrocnemius muscle (medial/lateral head, GM/GL; ω = 151 ± 25 Hz) and soleus muscle (SOL; ω = 102 ± 32 Hz). If considered in the PVC, TPC in individual muscles was similar (TPC = 98 ± 11/96 ± 14/99 ± 8/100 ± 12 mM in GM/GL/SOL/TA). Comparison with tissue sodium concentrations suggested that residual quadrupolar interactions might also influence the Na MRI signal of lower leg muscles. A TPC determination of individual lower leg muscles is feasible and can therefore be applied in future studies. Considering a varying residual quadrupolar interaction for PVC of K MRI data is essential to reliably assess potassium concentrations in individual muscles.
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http://dx.doi.org/10.1002/nbm.4819 | DOI Listing |
Clin Cosmet Investig Dermatol
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Institute of Dermatology, Guangzhou Medical University, Guangzhou, 510095, People's Republic of China.
Psoriasis is a chronic autoimmune skin disorder characterized by high morbidity and a tendency for recurrence. Although biologic therapy for lesion clearance can achieve PASI 90/100, refractory sites remain challenging to completely clear, particularly on the lower legs and elbows. To explore the efficacy of novel treatments for these resistant sites, we present a clinical observation on the safety and effectiveness of fractional carbon dioxide (CO2) laser therapy combined with secukinumab for four patients with moderate-to-severe plaque psoriasis.
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View Article and Find Full Text PDFJ Neurol Surg Rep
October 2024
Department of Rehabilitation Medicine, Amsterdam University Medical Center, Amsterdam, The Netherlands.
Selective dorsal rhizotomy (SDR) is a surgical technique to treat spasticity, mainly in children with spastic cerebral palsy (CP). In this report, a unique case of a late arachnoid cyst, causing radiating pain in the left leg, is presented. This is relevant to clinicians managing the long-term follow-up of patients who underwent selective dorsal rhizotomy (SDR).
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Trauma and Orthopaedics, Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, GBR.
Popliteal artery entrapment syndrome (PAES) is a rare cause of exertional leg pain in young adults, which is caused by compression of the popliteal artery by the surrounding muscular structure. Due to significant overlap in symptoms with other conditions, limitations of diagnostic imaging, and lack of awareness, PAES is frequently misdiagnosed, resulting in late complications and poor prognosis. Clinical assessment is crucial in making the initial diagnosis and referring for relevant investigations for PAES.
View Article and Find Full Text PDFBiomed Res Int
December 2024
Laboratory of Molecular Analysis, Graduate Program in Rehabilitation Science, Faculdade de Ciências da Saúde e Tecnologias, Universidade de Brasília, Brasília, Distrito Federal, Brazil.
Runners frequently suffer from medial tibial stress syndrome (MTSS), often linked to excessive eccentric muscle contractions causing periosteal traction by the muscles in the deep posterior compartment. However, the effects of MTSS on these muscles and tendons remain underexplored. This study is aimed at investigating changes in muscle and tendon volumes in this compartment, as well as cross-sectional area measurements, using magnetic resonance imaging.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!