Fig. 5

In vitro temperature measurements. a Temperature at the tip of the NHLBI passive guidewire (black) and the commercial Glidewire comparator (red) during 60 s bSSFP CMR scans at a flip angle of 75°. b Pullback of the temperature probe alongside the NHLBI passive guidewire. After baseline steady state, scanning begins (at t = 30 s), then the probe is withdrawn from beyond the guidewire tip back to the guidewire tip (at t = 60 s). The probe remains at the tip, during which time the temperature rises by 1.2 °C. Finally the probe is pulled back further (beginning at t = 120 s) indicating that the temperature rise is confined to the tip