Comparative analysis of 23Na T1 and T2* relaxation times in healthy muscle tissue at 3 and 7 T - Nour Zeitouni; Laurent Ruck; Lena V. Gast; Michael Uder; Arnd Dörfler; Armin M. Nagel; Teresa Gerhalter (Magnetic Resonance Materials in Physics, Biology and Medicine, 2026)