Table 4.

Likert-type scoring of device visibility and confidence in catheter and guidewire position. Only catheter shaft visibility reached statistical significance (p = 0.001)

Imaging test	Guidewire low-SAR spiral GRE	No guidewire normal-SAR rectilinear bSSFP
Tip visibility of balloon catheter with saturation pre-pulse(scale 0–3)	3.0 ± 0.2	2.9 ± 0.3
Shaft visibility of balloon catheter (scale 0–3)	1.1 ± 1.2	0.0 ± 0.0
Confidence that balloon catheter tip is at the intended location (scale 0–2)	2.0 ± 0.0	2.0 ± 0.0
Tip visibility of guidewire (scale 0–3)	0.5 ± 0.8	N/A
Shaft visibility of guidewire (scale 0–3)	1.6 ± 1.1	N/A
Confidence that guidewire tip is at the intended location (scale 0–2)	0.4 ± 0.6	N/A