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Detecting response of rat C6 glioma tumors to radiotherapy using hyperpolarized [1‐ 13 C]pyruvate and 13 C magnetic resonance spectroscopic imaging
Author(s) -
Day Sam E.,
Kettunen Mikko I.,
Cherukuri Murali Krishna,
Mitchell James B.,
Lizak Martin J.,
Morris H. Douglas,
Matsumoto Shingo,
Koretsky Alan P.,
Brindle Kevin M.
Publication year - 2011
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.22698
Subject(s) - glioma , nuclear medicine , magnetic resonance imaging , chemistry , brain tumor , positron emission tomography , nuclear magnetic resonance , radiation therapy , deoxyglucose , irradiation , medicine , pathology , cancer research , radiology , physics , biochemistry , nuclear physics
We show here that hyperpolarized [1‐ 13 C]pyruvate can be used to detect treatment response in a glioma tumor model; a tumor type where detection of response with 18 fluoro‐2‐deoxyglucose, using positron emission tomography, is limited by the high background signals from normal brain tissue. 13 C chemical shift images acquired following intravenous injection of hyperpolarized [1‐ 13 C]pyruvate into rats with implanted C6 gliomas showed significant labeling of lactate within the tumors but comparatively low levels in surrounding brain.Labeled pyruvate was observed at high levels in blood vessels above the brain and from other major vessels elsewhere but was detected at only low levels in tumor and brain.The ratio of hyperpolarized 13 C label in tumor lactate compared to the maximum pyruvate signal in the blood vessels was decreased from 0.38 ± 0.16 to 0.23 ± 0.13, (a reduction of 34%) by 72 h following whole brain irradiation with 15 Gy. Magn Reson Med, 2011. © 2010 Wiley‐Liss, Inc.