Phosphorus nuclear magnetic resonance imaging in solid bone
Thesis/Dissertation
·
OSTI ID:5670823
Phosphorus ({sup 31}P) nuclear magnetic resonance (NMR) double-pulse transient experiments of solid bone have shown that the spins dephased by the dipolar spin-spin interactions can be refocused with a 90{degree}-{beta} pulse sequence so that an echo is observable at some time following the second pulse. The decay time constant of the maximum echo amplitude is larger than that of the free induction decay (FID) signal from a single 90{degree} pulse. Depending on the nutation angle of the second pulse, the former decay time constant is about three-five times as long as the latter one. The dipolar-echo properties of the bone may be relevant with the interpair dipolar interactions. The experiments have also show that, in general, the time for the transient signal from the double pulses to reach the maximum amplitude is not equal to the pulse separation. This can be attributed to the effect of the heteronuclear dipolar interactions. In addition, it is found experimentally that refocused gradients applied only in a time interval of the formation of an echo have the capability of phase-encoding spatial information. Based on this, a new imaging method was proposed. With the method, several {sup 31}P images of the solid bone samples have been obtained. The picture element size is 1-1.5 mm with very good signal-to-noise ratios. The imaging ability of the refocused gradients may be relevant with the inhomogeneous local field produced by the interpair dipolar interactions.
- Research Organization:
- Utah Univ., Salt Lake City, UT (United States)
- OSTI ID:
- 5670823
- Country of Publication:
- United States
- Language:
- English
Similar Records
Deuterium nuclear spin dipolar dephasing in quadrupolar echo experiments
Method of eliminating effects of spurious free induction decay NMR signal caused by imperfect 180 degrees pulses
Double echo symmetry-based REDOR and RESPDOR pulse sequences for proton detected measurements of heteronuclear dipolar coupling constants
Journal Article
·
Wed Nov 27 23:00:00 EST 1991
· Journal of Physical Chemistry; (United States)
·
OSTI ID:6817911
Method of eliminating effects of spurious free induction decay NMR signal caused by imperfect 180 degrees pulses
Patent
·
Mon Nov 19 23:00:00 EST 1984
·
OSTI ID:5865204
Double echo symmetry-based REDOR and RESPDOR pulse sequences for proton detected measurements of heteronuclear dipolar coupling constants
Journal Article
·
Tue Jan 18 19:00:00 EST 2022
· Journal of Magnetic Resonance
·
OSTI ID:1846444