Comparison of Laser Speckle Contrast Imaging and Laser Doppler Imaging

By using the PeriIont (Perimed, Jarfalla, Sweden) device, 0.5 mL of a 10 mg/ml Sodium nitroprusside solution was used transdermally and ionised with a current strength of 200 µA for 1 minute.

The upper arm was occluded for 30 seconds with a pneumatic cuff up to 50 mmHg, 80 mmHg, 110 mmHg, 140 mmHg, and 170 mmHg. The volunteer had rest for 5 minutes between each occlusion procedure.