Encoding to the longitudinal magnetization for MR imaging and flow velocity mapping.

Encoding to the longitudinal magnetization for MR imaging and flow velocity mapping. Research Abstract Details 

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Encoding to the longitudinal magnetization for MR imaging and flow velocity mapping. Abstract Text:

Jung-Jiin Hsu,Irving J Lowe,

Phase-encoding to the longitudinal magnetization is implemented by adding encoding gradient pulses in the evolution period tau of the NMR pulse sequence 90 degrees+x-tau-90 degrees-x. This work focuses on the effect of the spin-lattice relaxation and its removal and on the constraint that the 90 degrees-x pulse can only transform the phase of the transverse magnetization partially to the longitudinal magnetization. Theoretical analysis shows that the encoded phase information and the spin-lattice relaxation effect are separable and the latter is identical in each repetition in collecting phase-encoding data. Thus the relaxation effect can be eliminated by subtracting a second data set whose phase information is inverted or by alternating the polarity of the relaxation contribution. From data with partial phase information, Fourier-transform image reconstruction results in mirror aliasing in which the two halves of the Fourier spectrum of positive and negative coordinates overlap. Removal of mirror aliasing requires imaging data of the orthogonal component. Nevertheless mirror aliasing is not necessarily a problem, depending on the subject of study. Phase-encoding to the longitudinal magnetization for spatial MRI and flow velocity mapping are demonstrated using the rotating ultra-fast imaging sequence (RUFIS).

Encoding to the longitudinal magnetization for MR imaging and flow velocity mapping. Publishing Authors By Initials

JJ Hsu,IJ Lowe,

For similar information science: computing methodologies: signal processing, computer-assisted research abstracts see: information science: computing methodologies: signal processing, computer-assisted research

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Encoding to the longitudinal magnetization for MR imaging and flow velocity mapping. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Journal of magnetic resonance (San Diego, Calif. :

VOLUME: 183

Page Numbers: 41-9

Journal Abbreviation: J. Magn. Reson.

ISSN: 1090-7807

DAY: 10

MONTH: 08

YEAR: 2006

Encoding to the longitudinal magnetization for MR imaging and flow velocity mapping. Information

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LANGUAGE: eng

NlmUniqueID: 9707935

Encoding to the longitudinal magnetization for MR imaging and flow velocity mapping. Keywords Mesh Terms:

KEYWORDS: Signal Processing, Computer-Assisted

MESH TERMS: methods

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Grant and Affiliation Information for Encoding to the longitudinal magnetization for MR imaging and flow velocity mapping.

AFFILIATION: Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA. jjhsu@stanford.edu

Country: United States

AGENCY: United States NCRR

GRANT: P41RR-03631

ACRONYM: RR

MEDLINETA: J Magn Reson

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