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Figure 2 | Journal of Cardiovascular Magnetic Resonance

Figure 2

From: Calibration of myocardial T2 and T1 against iron concentration

Figure 2

T1 and T2 measurement. T1 and T2 images of the same mid ventricular slice are shown. A. T1 recovery. Following a 180° inversion pulse, magnetisation recovers to its original value and different myocardial signal intensities are seen in the images taken at a range of inversion times from 64 ms to 10 seconds (the latter is used to allow magnetisation to fully recover). Myocardial signal is initially negative, recovering through the zero point (where the myocardium appears black) back to its maximal intensity. A least-squares fit allows the calculation of T1, defined as the time taken for magnetisation to recover 63% of its original value. B. T2 images showing the initial high myocardial signal which decays over time and the corresponding mono-exponential decay curve of signal intensity plotted against echo time used to calculate T2. The final eight points of the curve have been truncated to allow for background noise.

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