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A precise and fast temperature mapping using water proton chemical shift
Author(s) -
Ishihara Yasutoshi,
Calderon Arturo,
Watanabe Hidehiro,
Okamoto Kazuya,
Suzuki Yoshinori,
Kuroda Kagayaki,
Suzuki Yutaka
Publication year - 1995
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.1910340606
Subject(s) - imaging phantom , nuclear magnetic resonance , proton , analytical chemistry (journal) , resolution (logic) , chemistry , pulse (music) , phase (matter) , chemical shift , materials science , pulse sequence , physics , optics , chromatography , quantum mechanics , organic chemistry , artificial intelligence , detector , computer science
Abstract A new temperature measurement procedure using phase mapping was developed that makes use of the temperature dependence of the water proton chemical shift. Highly accurate and fast measurements were obtained during phantom and in vivo experiments. In the pure water phantom experiments, an accuracy of more than ± 0.5°C was obtained within a few seconds/slice using a field echo pulse sequence ( TR/TE = 115/13 ms, matrix = 128 × 128, number of slices = 5). The temperature dependence of the water proton chemical shift was found to be almost the same for different materials with a chemical composition similar to living tissues (water, glucide, protein). Using this method, the temperature change inside a cat's brain was obtained with an accuracy of more than ± 1°C and an in‐plane resolution of 0.6 x 0.6 mm. The temperature measurement error was affected by several factors in the living system (B 0 shifts caused by position shifts of the sample, blood flow, etc.), the position shift effect being the most serious.