Table 2.

Nitinol guidewire heating in vivo

	Wire + Catheter			Wire 10 cm distal to catheter
	Sheath	Aorta	Arch	Sheath	Aorta	Arch
Cartesian bSSFP (flip = 60°, TR = 2.86 ms)	4.34 °C	0.18 °C	0.14 °C	0.22 °C	0.13 °C	0.05 °C
Cartesian bSSFP (flip = 45°, TR = 2.86 ms)	2.50 °C	0.08 °C	0.10 °C	0.17 °C	0.09 °C	0.04 °C
Spiral GRE (16 interleaves, flip = 10°, TR = 5.16 ms)	0.09 °C	−0.04 °C	0.01 °C	−0.02 °C	−0.02 °C	0.00 °C
Spiral GRE (8 interleaves, flip = 10°, TR = 8.60 ms)	0.06 °C	0.04 °C	0.06 °C	0.00 °C	0.03 °C	0.03 °C

In vivo temperature increase from baseline observed during 2 minutes of continuous imaging measured at the tip of the nitinol guidewire. Temperature was measured with the guidewire tip in the introducer sheath, in the aorta and at the aortic arch in a 60 kg swine