TY - JOUR
T1 - The Effect of Magnetic Field Inhomogeneity on the Transverse Relaxation of Quadrupolar Nuclei Measured by Multiple Quantum Filtered NMR
AU - Eliav, U.
AU - Kushnir, T.
AU - Knubovets, T.
AU - Itzchak, Y.
AU - Navon, G.
PY - 1997/9
Y1 - 1997/9
N2 - The effects of magnetic fields B0 and B1 inhomogeneities on techniques which are commonly used for the measurements of triple-quantum-filtered (TQF) NMR spectroscopy of 23Na in biological tissues are analyzed. The results of measurements by pulse sequences with and without refocusing of B0 inhomogeneities are compared. It is shown that without refocusing the errors in the measurement of the transverse relaxation times by TQF NMR spectroscopy may be as large as 100%, and thus, refocusing of magnetic field inhomogeneity is mandatory. Theoretical calculations demonstrate that without refocusing B0 inhomogeneities the spectral width and phase depend on the interpulse time intervals, thus, leading to errors in the measured relaxation times. It is shown that pulse sequences that were used for the refocusing of the magnetic field (B0) inhomogeneity also reduce the sensitivity of the experimental results to radiofrequency (B1) magnetic field inhomogeneity.
AB - The effects of magnetic fields B0 and B1 inhomogeneities on techniques which are commonly used for the measurements of triple-quantum-filtered (TQF) NMR spectroscopy of 23Na in biological tissues are analyzed. The results of measurements by pulse sequences with and without refocusing of B0 inhomogeneities are compared. It is shown that without refocusing the errors in the measurement of the transverse relaxation times by TQF NMR spectroscopy may be as large as 100%, and thus, refocusing of magnetic field inhomogeneity is mandatory. Theoretical calculations demonstrate that without refocusing B0 inhomogeneities the spectral width and phase depend on the interpulse time intervals, thus, leading to errors in the measured relaxation times. It is shown that pulse sequences that were used for the refocusing of the magnetic field (B0) inhomogeneity also reduce the sensitivity of the experimental results to radiofrequency (B1) magnetic field inhomogeneity.
UR - http://www.scopus.com/inward/record.url?scp=0005155269&partnerID=8YFLogxK
U2 - 10.1006/jmre.1997.1208
DO - 10.1006/jmre.1997.1208
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AN - SCOPUS:0005155269
SN - 1090-7807
VL - 128
SP - 82
EP - 86
JO - Journal of Magnetic Resonance
JF - Journal of Magnetic Resonance
IS - 1
ER -