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Figure 2 An angiographic frame demonstrating the technique we used. In the proximal part, the balloon (B1) was inflated and temperature was recorded by the thermistor (Th) located distal to the balloon. The thermography catheter was advanced over a conventional floppy guidewire (GW) 0.014-in. in diameter. Distally, the Doppler guidewire (D-GW) is shown by which coronary flow velocity was continuously recorded.