Temperature dependence of relaxation times and temperature mapping in ultra-low-field MRI.
作者： Panu T. Vesanen , Koos C.J. Zevenhoven , Jaakko O. Nieminen , Juhani Dabek , Lauri T. Parkkonen
DOI: 10.1016/J.JMR.2013.07.009
关键词:
摘要: Ultra-low-field MRI is an emerging technology that allows and NMR measurements in microtesla-range fields. In this work, the possibilities of relaxation-based temperature with ultra-low-field were investigated by measuring T1 T2 relaxation times agarose gel at 50 μT-52 mT temperatures 5-45°C. Measurements a 3T scanner made for comparison. The Bloembergen-Purcell-Pound theory was combined two-state model to explain field-strength dependence data. results show dependencies microtesla range differ drastically from those 3T; effect on reversed approximately 5 mT. obtained used reconstruct maps scans. These time-dependent measured phantom μT reproduced gradient good contrast.
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