TY  - JOUR
AU  - Gast, Lena V
AU  - Gerhalter, Teresa
AU  - Hensel, Bernhard
AU  - Uder, Michael
AU  - Nagel, Armin
TI  - Double quantum filtered 23 Na MRI with magic angle excitation of human skeletal muscle in the presence of B0 and B1 inhomogeneities.
JO  - NMR in biomedicine
VL  - 31
IS  - 12
SN  - 0952-3480
CY  - New York, NY
PB  - Wiley
M1  - DKFZ-2018-01580
SP  - e4010
PY  - 2018
N1  - 2018 Dec;31(12):e4010
AB  - Double quantum filtered 23 Na MRI with magic angle excitation (DQF-MA) can be used to selectively detect sodium ions located within anisotropic structures such as muscle fibers. It might therefore be a promising tool to analyze the microscopic environment of sodium ions, for example in the context of osmotically neutral sodium retention. However, DQF-MA imaging is challenging due to various signal dependences, on both measurement parameters and external influences. The aim of this work was to examine how B0 in combination with B1 inhomogeneities alter the DQF-MA signal intensity. We showed that, in the presence of B0 inhomogeneities, flip angle schemes with only one 54.7° pulse can be favorable compared with the classical 90°-54.7°-54.7° scheme. DQF-MA images of the human lower leg were acquired at B0  = 3 T with a nominal spatial resolution of 12 × 12 × 36 mm3 within an acquisition time of TAcq  < 10 min, and compared with spin density weighted (DW), as well as triple quantum filtration (TQF) 23 Na images. We found mean normalized signal-to-noise ratios of TQF/DW = 13.7 ± 2.3
LB  - PUB:(DE-HGF)16
C6  - pmid:30290039
DO  - DOI:10.1002/nbm.4010
UR  - https://inrepo02.dkfz.de/record/140816
ER  -