Magnetic Resonance thermometry (MRT) in activated brown adipose tissue (BAT) is able to measure the BAT function directly. A previous proposed fat-referenced 1H proton resonance frequency shift MRT method is adopted to compare the thermogenic capacity of rats injected with different dose of norepinephrine (NE). It is found that the rats with 2mg/kg and 1mg/kg NE injection had comparable maximum temperature rises after NE injection (7.1oC vs. 6.7oC), while temperature rises for rats with NE of 0.5mg/kg was significantly lower (3.8oC).
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