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Multiband spectral-spatial RF excitation for hyperpolarized [2-13 C]dihydroxyacetone 13 C-MR metabolism studies.


ABSTRACT: PURPOSE:To develop a specialized multislice, single-acquisition approach to detect the metabolites of hyperpolarized (HP) [2-13 C]dihydroxyacetone (DHAc) to probe gluconeogenesis in vivo, which have a broad 144?ppm spectral range (?4.6 kHz at 3T). A novel multiband radio-frequency (RF) excitation pulse was designed for independent flip angle control over five to six spectral-spatial (SPSP) excitation bands, each corrected for chemical shift misregistration effects. METHODS:Specialized multiband SPSP RF pulses were designed, tested, and applied to investigate HP [2-13 C]DHAc metabolism in kidney and liver of fasted rats with dynamic 13 C-MR spectroscopy and an optimal flip angle scheme. For comparison, experiments were also performed with narrow-band slice-selective RF pulses and a sequential change of the frequency offset to cover the five frequency bands of interest. RESULTS:The SPSP pulses provided a controllable spectral profile free of baseline distortion with improved signal to noise of the metabolite peaks, allowing for quantification of the metabolic products. We observed organ-specific differences in DHAc metabolism. There was two to five times more [2-13 C]phosphoenolpyruvate and about 19 times more [2-13 C]glycerol 3-phosphate in the liver than in the kidney. CONCLUSION:A multiband SPSP RF pulse covering a spectral range over 144?ppm enabled in vivo characterization of HP [2-13 C]DHAc metabolism in rat liver and kidney. Magn Reson Med 77:1419-1428, 2017. © 2016 International Society for Magnetic Resonance in Medicine.

SUBMITTER: Marco-Rius I 

PROVIDER: S-EPMC5040611 | biostudies-literature | 2017 Apr

REPOSITORIES: biostudies-literature

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Multiband spectral-spatial RF excitation for hyperpolarized [2-<sup>13</sup> C]dihydroxyacetone <sup>13</sup> C-MR metabolism studies.

Marco-Rius Irene I   Cao Peng P   von Morze Cornelius C   Merritt Matthew M   Moreno Karlos X KX   Chang Gene-Yuan GY   Ohliger Michael A MA   Pearce David D   Kurhanewicz John J   Larson Peder E Z PE   Vigneron Daniel B DB  

Magnetic resonance in medicine 20160328 4


<h4>Purpose</h4>To develop a specialized multislice, single-acquisition approach to detect the metabolites of hyperpolarized (HP) [2-<sup>13</sup> C]dihydroxyacetone (DHAc) to probe gluconeogenesis in vivo, which have a broad 144 ppm spectral range (∼4.6 kHz at 3T). A novel multiband radio-frequency (RF) excitation pulse was designed for independent flip angle control over five to six spectral-spatial (SPSP) excitation bands, each corrected for chemical shift misregistration effects.<h4>Methods<  ...[more]

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