Human Heart Pulse Wave Responses Measured Simultaneously at Several Sensor Placements by Two MR-Compatible Fibre Optic Methods

Figure 1

Sensor placements used in the measurements. Three ECG sensors were placed as follows: One on the left shoulder (minus), one on the right shoulder (plus), and a third one on the stomach, to left of the navel. PPG-based sensors, on the other hand, were placed in one finger on both hands, on the forehead, and on a toe. In these measurements, source-detector distances varied from 2 mm to 30 mm. Finally, accelerometer sensors were placed on the chest and in the neck, on the carotid artery. All optical fibres used in the measurements were 10 m long and MR compatible.