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Fig. 8 | Journal of Cardiovascular Magnetic Resonance

Fig. 8

From: High-energy external defibrillation and transcutaneous pacing during MRI: feasibility and safety

Fig. 8

Temperature Changes under Defibrillation Pads during Continuous 2D bSSFP scan. The temperature registered by individual probes during a 6-min scan are shown with baseline temperature subtracted to calculate ΔT°C (a); thick lines indicate the maximum (Max T), mean (Mean T), and minimum (Min T) temperature changes. To determine the trajectory of the temperature changes, the lumped-capacitance single-term exponential heat-transfer model was applied in the following form: T = a − be−t/c, where T denotes temperature registered by the sensor and t is measurement time [24, 25]. The model satisfied acceptance criteria (RMSE < 0.03 and R2 > 0.98), and the model coefficients (a = 2.643; b = 2.295; c = 5.659) were used to predict the Max, Mean, and Min T trajectories beyond the 6-min interval (b). Note that the predicted Mean T trajectory is consistent (error: 0.1 °C) with the temperature registered under defibrillator pads after 11 min of similar bSSFP scanning in swine reported by Schmidt et al. (cross) [11]

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