The pulsed-field-gradient stimulated-echo method is a wellbecomes small compared to the square of the applied gradiestablished technique for studying molecular motion without ent (1). The other approach is to use bipolar gradients todisturbing the system under investigation. In porous media, the get
Improved PFG Stimulated-Echo Method for the Measurement of Diffusion in Inhomogeneous Fields
β Scribed by L.L. Latour; L.M. Li; C.H. Sotak
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 511 KB
- Volume
- 101
- Category
- Article
- ISSN
- 1064-1866
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π SIMILAR VOLUMES
Nutation echoes are generated by radiofrequency (RF) pulses with an inhomogeneous amplitude, B 1 β«Ψβ¬ B 1 (r), in inhomogeneous magnetic fields, B 0 β«Ψβ¬ B 0 (r). The two gradients of strengths G 1 and G 0 , respectively, must be aligned in parallel for a maximum echo signal. After two RF pulses, two
Over the past decade several pulsed field gradient stimulated-echo methods have been presented for diffusion measurements in heterogeneous media. These methods have reduced or eliminated the coupling between the applied magnetic field gradient and a constant internal magnetic field gradient caused b
## Abstract It is shown that the modified stimulated echo sequence, [ΞΈ]~(Β±__x__Β±__y__)~β__t__~1~β[ΞΈ]~(+__x__)~β__t__~2~/2β[2ΞΈ]~(+__x__)~β__t__~2~/2β[ΞΈ]~(+__x__)~β__t__~1~βAcq(Β±__x__ β __y__), denoted as MSTE[2ΞΈ]~__x__~ according to the exciter phase of the 2ΞΈ pulse, is able to perform proton spectr
## Abstract A magnetic resonance imaging method for measuring the __T__~2~ relaxation time constant is proposed. It is based on the assumption that, under very general conditions, the MR signal near a spin echo has a special symmetry arising from the refocusing nature of the 180Β° RF pulse. A gradie