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Application of subsecond spiral chemical shift imaging to real‐time multislice metabolic imaging of the rat in vivo after injection of hyperpolarized 13 C 1 ‐pyruvate
Author(s) -
Mayer Dirk,
Yen YiFen,
Tropp James,
Pfefferbaum Adolf,
Hurd Ralph E.,
Spielman Daniel M.
Publication year - 2009
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.22041
Subject(s) - dynamic imaging , chemistry , nuclear magnetic resonance , hyperpolarization (physics) , in vivo , multislice , nuclear magnetic resonance spectroscopy , image processing , physics , computer science , microbiology and biotechnology , artificial intelligence , digital image processing , image (mathematics) , biology
Dynamic nuclear polarization can create hyperpolarized compounds with MR signal‐to‐noise ratio enhancements on the order of 10,000‐fold. Both exogenous and normally occurring endogenous compounds can be polarized, and their initial concentration and downstream metabolic products can be assessed using MR spectroscopy. Given the transient nature of the hyperpolarized signal enhancement, fast imaging techniques are a critical requirement for real‐time metabolic imaging. We report on the development of an ultrafast, multislice, spiral chemical shift imaging sequence, with subsecond acquisition time, achieved on a clinical MR scanner. The technique was used for dynamic metabolic imaging in rats, with measurement of time‐resolved spatial distributions of hyperpolarized 13 C 1 ‐pyruvate and metabolic products 13 C 1 ‐lactate and 13 C 1 ‐alanine, with a temporal resolution of as fast as 1 s. Metabolic imaging revealed different signal time courses in liver from kidney. These results demonstrate the feasibility of real‐time, hyperpolarized metabolic imaging and highlight its potential in assessing organ‐specific kinetic parameters. Magn Reson Med, 2009. © 2009 Wiley‐Liss, Inc.