Journal
JOURNAL OF MAGNETIC RESONANCE
Volume 187, Issue 2, Pages 357-362Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jmr.2007.05.014
Keywords
C-13; hyperpolarized; pyruvate; spectroscopic imaging; MRSI
Funding
- NCI NIH HHS [R01 CA 111291] Funding Source: Medline
- NIBIB NIH HHS [R21 EB 005363, R01 EB 007588] Funding Source: Medline
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Dynamic nuclear polarization of metabolically active compounds labeled with C-13 has been introduced as a means for imaging metabolic processes in vivo. To differentiate between the injected compound and the various metabolic products, an imaging technique capable of separating the different chemical-shift species must be used. In this paper, the design and testing of a pulse sequence for rapid magnetic resonance spectroscopic imaging (MRSI) of hyperpolarized C-13 is presented. The pulse sequence consists of a small-tip excitation followed by a double spin echo using adiabatic refocusing pulses and a flyback echo-planar readout gradient. Key elements of the sequence are insensitivity to calibration of the transmit gain, the formation of a spin echo giving high-quality spectral information, and a small effective tip angle that preserves the magnetization for a sufficient duration. Experiments in vivo showed three-dimensional coverage with excellent spectral quality and SNR. (c) 2007 Elsevier Inc. All rights reserved.
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